Finding the right smart thermostat for heat-only systems can be challenging, as these setups often lack the complexity of multi-zone or cooling features. The ecobee Smart Thermostat Premium stands out as the best overall choice thanks to its advanced features and compatibility, while the Honeywell Home X7S offers great value for budget-conscious buyers. Another notable option is the Google Nest Thermostat, known for its intuitive design and smart home integration. The main tradeoffs in this category typically involve balancing ease of installation, compatibility with existing systems, and smart features. Continue reading for a detailed comparison to help you find the best fit for your heat-only setup.
Complete the kit
Key Takeaways
- Compatibility with heat-only systems varies; C-wire requirements are a common consideration.
- amazon.com/dp/B0G7TGNB49?tag=plantandpest.com-20&ascsubtag=dc-592551″ target=”_blank” rel=”nofollow sponsored noopener”>Smart features like voice control and app connectivity are widespread, but their implementation differs.
- Higher-priced models tend to offer better build quality and more advanced automation options.
- DIY installation is possible with many models, but some may still require professional setup.
- Energy savings and integration with smart home ecosystems are key benefits, but they depend on system compatibility.
| ecobee Smart Thermostat Premium – WiFi, Siri & Alexa Built-In, Smart Sensor |  | Best Overall for Advanced Comfort and Integration | Compatibility: Most 24VAC HVAC systems | Display: Large, vibrant display | Voice Assistants: Siri, Alexa | VIEW ON AMAZON | See Our Full Breakdown |
| Honeywell Home X7S Smart Wi-Fi Programmable Thermostat, Black |  | Best Value for Customizable Smart Control | Display: 4.3 inch color touchscreen | Connectivity: Wi-Fi, 2.4/5 GHz | Compatibility: Up to 3 heat/2 cool systems | VIEW ON AMAZON | See Our Full Breakdown |
| Smart Wi-Fi Thermostat for Single-Stage 1 Heat/1 Cool Systems, App Control, 7-Day Programmable, C-Wire Required |  | Best for Simple, Conventional Systems | Compatible Systems: Single-stage 1 Heat/1 Cool | Display Type: Backlit LCD | Wi-Fi Compatibility: 2.4 GHz | VIEW ON AMAZON | See Our Full Breakdown |
| Honeywell Home RTH9600WF Smart Color Thermostat ENERGY STAR Wi-Fi Programmable Touchscreen Alexa Ready |  | Best for Easy Smart Integration and Customization | Display: High-definition color touchscreen | Connectivity: Wi-Fi | Compatibility: Forced air, hot water, steam, heat pumps | VIEW ON AMAZON | See Our Full Breakdown |
| Sensi Smart Thermostat ST55 – Wi-Fi, DIY Installation, Alexa Compatible, Energy Star Certified |  | Best Budget-Friendly Choice for Easy DIY Setup | Connectivity: Wi-Fi | Compatibility: Most 24VAC systems | Certifications: Energy Star | VIEW ON AMAZON | See Our Full Breakdown |
| Sensi Lite Smart Thermostat ST25 – WiFi, Alexa Compatible, Energy Star Certified |  | Best Overall for Easy DIY Heat-Only System Control | Model: ST25 | Connectivity: WiFi | Voice Assistant Compatibility: Alexa | VIEW ON AMAZON | See Our Full Breakdown |
| Honeywell Home X2P Programmable Thermostat, White |  | Best Budget-Friendly Programmable for Traditional Systems | Model: X2P (RTH20B) | Color: White | Scheduling: 5-2 day programmable | VIEW ON AMAZON | See Our Full Breakdown |
| Google Nest Thermostat – Smart Programmable Wi-Fi Thermostat (Snow) |  | Best for Energy Savings and Smart Home Integration | Brand: Google Nest | Color: Snow | Certification: ENERGY STAR | VIEW ON AMAZON | See Our Full Breakdown |
| Sensi Lite Smart Thermostat, WiFi, DIY, Alexa, Energy Star Certified |  | Best for Privacy-Conscious DIY Users with Heat-Only Systems | Connectivity: WiFi | Compatibility: Most HVAC with common wire | Energy Savings: Approximately 23% | VIEW ON AMAZON | See Our Full Breakdown |
| ecobee Smart Thermostat Essential – WiFi Thermostat, Energy Star Certified |  | Best Overall for Versatile Compatibility and Energy Savings | Compatibility: Most 24 VAC HVAC systems, including gas, oil, electric, dual fuel, and heat pump | Connectivity: WiFi | Energy Star Certified: Yes | VIEW ON AMAZON | See Our Full Breakdown |
| Amazon Smart Thermostat – Works with Alexa and Ring, C-Wire Required |  | Best for Alexa Ecosystem Enthusiasts and Simplicity | Brand: Amazon | Compatibility: Alexa, Ring | Certification: ENERGY STAR | VIEW ON AMAZON | See Our Full Breakdown |
| Honeywell Home X2S Smart Wi-Fi Thermostat, Gray |  | Best for Smart Home Integration & Advanced Features | Model: X2S | Color: Gray | Connectivity: Wi-Fi | VIEW ON AMAZON | See Our Full Breakdown |
| Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat, 7-Day Programmable, Touch Screen, Gray |  | Best for Customization & Color Display | Brand: Honeywell Home | Model: RTH9585WF | Color: Gray | VIEW ON AMAZON | See Our Full Breakdown |
| smart thermostats for heatonly system | Compatibility | Connectivity |
|---|---|---|
| ecobee Smart Thermostat Premiu | Most 24VAC HVAC systems | — |
| Honeywell Home X7S Smart Wi-Fi | Up to 3 heat/2 cool systems | Wi-Fi, 2.4/5 GHz |
| Smart Wi-Fi Thermostat for Sin | — | — |
| Honeywell Home RTH9600WF Smart | Forced air, hot water, steam, heat pumps | Wi-Fi |
| Sensi Smart Thermostat ST55 | Most 24VAC systems | Wi-Fi |
| Sensi Lite Smart Thermostat ST | — | WiFi |
| Honeywell Home X2P Programmabl | 1 Heat/1 Cool, 750 mV, hot water, forced air | — |
| Google Nest Thermostat | — | Wi-Fi |
| Sensi Lite Smart Thermostat | Most HVAC with common wire | WiFi |
| ecobee Smart Thermostat Essent | Most 24 VAC HVAC systems, including gas, oil, electric, dual fuel, and heat pump | WiFi |
| Amazon Smart Thermostat | Alexa, Ring | — |
| Honeywell Home X2S Smart Wi-Fi | — | Wi-Fi |
| Honeywell Home RTH9585WF Wi-Fi | Amazon Alexa, Google Home | Wi-Fi |
More Details on Our Top Picks
ecobee Smart Thermostat Premium – WiFi, Siri & Alexa Built-In, Smart Sensor
The ecobee Smart Thermostat Premium stands out for its sleek, premium metal design and comprehensive features, making it ideal for those who want a high-end, versatile thermostat. Its built-in air quality monitor and occupancy sensing provide smarter climate control compared to more basic models like the Sensi ST55. The included SmartSensor enhances comfort by focusing heating where it matters most, and the voice control support with both Siri and Alexa adds convenience. However, its compatibility depends on checking your HVAC system beforehand, and Siri functions require an Apple home hub, which can add complexity. Compared with the Honeywell RTH9600WF, it offers more advanced sensing but at a higher price point, making it better suited for tech-savvy users seeking seamless ecosystem integration. The choice involves balancing premium features against the need for compatible HVAC wiring and systems.
Pros:- Elegant, durable metal design enhances aesthetic appeal
- Includes a SmartSensor for improved zone control and comfort
- Built-in air quality monitor and occupancy sensing for smarter operation
- Supports Siri and Alexa voice commands for hands-free control
Cons:- Requires checking HVAC compatibility; may not work with all systems
- Siri functions need an Apple home hub, adding setup complexity
- Higher price point compared to simpler models like Sensi ST55
Best for: Homeowners with compatible 24VAC HVAC systems who want premium design, smart features, and voice control support
Not ideal for: Those with older or incompatible HVAC setups or who prefer simple, budget-friendly thermostats without integrated sensors
- Compatibility:Most 24VAC HVAC systems
- Display:Large, vibrant display
- Voice Assistants:Siri, Alexa
- Certification:ENERGY STAR
- Included Components:SmartSensor, Power Extender Kit, Trim Kit
- Design:Premium metal
- Air Quality Monitor:Built-in
- Occupancy Sensing:Built-in radar technology
Our verdict“This pick is best for those seeking a premium, feature-rich thermostat that integrates well with smart home ecosystems and advanced comfort features.”
Honeywell Home X7S Smart Wi-Fi Programmable Thermostat, Black
The Honeywell Home X7S offers a compelling balance of smart features and affordability, making it suitable for users who want a customizable display and integrated occupancy detection. Its 4.3-inch color screen provides a vibrant interface, surpassing the simpler LCDs of models like the Sensi ST55. It supports major smart home platforms including Alexa, Google Assistant, and Apple, and is Matter certified, ensuring future-proof compatibility. The included C-Wire voucher simplifies installation for most homes, although homes without existing wiring may face challenges. Compared to the ecobee Premium, it lacks built-in air quality monitoring, but it offers more flexible smart home integration at a lower price point. This thermostat is ideal for users wanting advanced connectivity and customization without the high cost of premium models.
Pros:- Vivid 4.3-inch color display with customizable options
- Supports multiple voice platforms including Alexa, Google, and Apple
- Matter certified for broad future compatibility
- Includes a free C-Wire Adapter voucher for easier installation
Cons:- Requires C-wire, which may involve mailing in the voucher and waiting for delivery
- Limited air quality features—no built-in air sensors
- Not compatible with electric baseboard heating
Best for: Tech-savvy homeowners seeking a versatile, customizable thermostat compatible with major smart home ecosystems
Not ideal for: Users with electric baseboard heating or those who prefer simple, plug-and-play thermostats without extensive app control
- Display:4.3 inch color touchscreen
- Connectivity:Wi-Fi, 2.4/5 GHz
- Compatibility:Up to 3 heat/2 cool systems
- Smart Home:Alexa, Google, Apple, Matter
- Certification:ENERGY STAR
- C-Wire Required:Yes, voucher included
Our verdict“This thermostat is well-suited for those who want a flexible, connected device that integrates seamlessly with various smart home platforms without the expense of high-end features.”
Smart Wi-Fi Thermostat for Single-Stage 1 Heat/1 Cool Systems, App Control, 7-Day Programmable, C-Wire Required
This single-stage Wi-Fi thermostat is designed for straightforward installation and operation, making it a practical choice for homes with simple heating and cooling setups. Its app control and 7-day scheduling provide convenient remote management, similar to the Sensi ST55. The device’s accurate temperature control within 2°F ensures comfort without overcomplicating features. However, its limited compatibility means it’s unsuitable for multi-stage systems or heat pumps, unlike the ecobee Premium. Its reliance on a C-wire aligns with most traditional homes but excludes line-voltage systems. This model is best for users with basic, single-stage systems who want reliable, no-fuss Wi-Fi control without extra bells and whistles.
Pros:- Easy app control and 7-day programmable scheduling
- Accurate temperature control within 2°F
- Simple installation with clear wiring and mounting
- Supports remote control via smartphone
Cons:- Requires a C-wire, which may require additional wiring or setup
- Limited to single-stage systems; not compatible with heat pumps or multi-stage setups
- Works only on 2.4 GHz Wi-Fi networks
Best for: Homeowners with conventional single-stage HVAC systems seeking a reliable, straightforward Wi-Fi thermostat
Not ideal for: Users with multi-stage, heat pump, or line-voltage systems requiring more advanced or different control options
- Compatible Systems:Single-stage 1 Heat/1 Cool
- Display Type:Backlit LCD
- Wi-Fi Compatibility:2.4 GHz
- Temperature Control Accuracy:Within 2°F
- Control:App and Button
- C-Wire Required:Yes
Our verdict“This thermostat is ideal for users with basic single-stage systems who prioritize reliability and straightforward remote control over advanced features.”
Honeywell Home RTH9600WF Smart Color Thermostat ENERGY STAR Wi-Fi Programmable Touchscreen Alexa Ready
The Honeywell RTH9600WF combines a vibrant color touchscreen with broad compatibility, making it suitable for users who want an easy-to-use interface and reliable Wi-Fi control. Its high-definition display enhances user interaction, and its compatibility with Alexa, Google, and Cortana provides flexible voice control options. While it supports many HVAC types, it is not suitable for electric baseboard heating, similar to the Sensi ST55. Its energy tracking features help optimize usage, but it lacks some of the more advanced sensors found in premium models like the ecobee Premium. This thermostat is a good choice for those seeking a straightforward, visually appealing device that integrates smoothly with popular smart platforms and offers basic energy management.
Pros:- Vivid color touchscreen for easy navigation
- Supports multiple smart home platforms including Alexa, Google, and Cortana
- Energy tracking and rebate programs available
- Wi-Fi connectivity for remote management
Cons:- Requires a C-wire for consistent power
- Limited air quality features—no built-in sensors
- Not compatible with electric baseboard heating
Best for: Homeowners wanting a user-friendly, customizable touchscreen thermostat compatible with major smart assistants
Not ideal for: Users with electric baseboard heating or those requiring extensive air quality sensors and advanced automation
- Display:High-definition color touchscreen
- Connectivity:Wi-Fi
- Compatibility:Forced air, hot water, steam, heat pumps
- Smart Home Integration:Alexa, Google Assistant, Cortana
- Energy Star Certified:Yes
- C-Wire Required:Yes
Our verdict“This pick is suitable for users who want an intuitive, visually engaging thermostat that works well with common smart home systems and offers basic energy management.”
Sensi Smart Thermostat ST55 – Wi-Fi, DIY Installation, Alexa Compatible, Energy Star Certified
The Sensi ST55 offers a straightforward approach to smart heating control, making it ideal for DIY enthusiasts. Its simple design and built-in level simplify installation, and it’s capable of saving around 23% on HVAC energy bills through flexible scheduling and remote access. Its compatibility with Alexa and ENERGY STAR certification add to its appeal for budget-conscious homeowners. Compared with the Honeywell X7S, it has fewer customization options but remains reliable for basic needs. Its main tradeoff is the absence of advanced sensors or multi-stage support, limiting its appeal for more complex systems. If ease of installation and affordability are priorities, the ST55 remains a strong contender.
Pros:- Easy DIY installation with built-in level and clear instructions
- No C-wire needed in most cases, simplifying wiring
- Energy Star certified with potential savings around 23%
- Supports Alexa for voice control
Cons:- Limited advanced features—lacks multi-stage or air quality sensors
- Not compatible with line-voltage systems
- Basic display without advanced customization
Best for: Homeowners seeking an easy-to-install, cost-effective smart thermostat with basic scheduling and remote control
Not ideal for: Users with complex, multi-stage, or heat pump systems looking for advanced automation and sensors
- Connectivity:Wi-Fi
- Compatibility:Most 24VAC systems
- Certifications:Energy Star
- Installation:DIY, no C-wire needed
- Scheduling:7-day
- Control:App and physical buttons
Our verdict“This thermostat suits budget-conscious users who want a simple, DIY-friendly device that delivers reliable remote control and energy savings without extra complexity.”
Sensi Lite Smart Thermostat ST25 – WiFi, Alexa Compatible, Energy Star Certified
The Sensi Lite Smart Thermostat ST25 stands out for its straightforward DIY installation, thanks to its built-in level and detailed instructions, making it ideal for homeowners comfortable with self-installation. Its ENERGY STAR certification highlights its focus on energy efficiency, helping users save approximately 23% on HVAC costs through scheduling and geofencing. Compared with the Google Nest Thermostat, it offers more privacy protections, as it does not sell user data, and works with Alexa for voice control. However, a C-wire is required for heat pump and heat/cool systems, which could complicate setup for some. This model is best suited for users who want reliable, energy-efficient control without complex features, and who are installing heat-only or heat pump systems that meet wiring requirements.
Pros:- Easy DIY installation with built-in level and step-by-step instructions
- ENERGY STAR certified, helping save about 23% on energy costs
- Remote control via a highly-rated mobile app
- Strong privacy protection—no selling of personal data
Cons:- Requires a C-wire for heat pump and heat/cool systems, which may not be present in all homes
- Limited compatibility with some HVAC system types
Best for: DIY homeowners with heat-only or heat pump systems who prioritize privacy and energy savings
Not ideal for: Homeowners with systems that lack a C-wire or those preferring plug-and-play solutions without wiring concerns
- Model:ST25
- Connectivity:WiFi
- Voice Assistant Compatibility:Alexa
- Certification:ENERGY STAR
- C-Wire Requirement:Required for heat pump and heat/cool systems
- App Support:iOS and Android
- Energy Savings:About 23%
Our verdict“This pick makes the most sense for DIYers seeking a reliable, energy-efficient thermostat for heat-only systems, willing to handle wiring requirements.”
Honeywell Home X2P Programmable Thermostat, White
The Honeywell Home X2P offers dependable 5-2 day scheduling, making it suitable for households with predictable routines. Its large, backlit display ensures easy readability, especially in darker environments. Compared to more advanced Wi-Fi models, it focuses on core programmable features, making it ideal for users who prefer a straightforward, non-smart experience. While it installs easily via the Honeywell UWP wall plate, it lacks remote control capabilities or energy reports, limiting its flexibility. It’s a good choice for those with basic HVAC needs who want reliable scheduling without smart features or Wi-Fi dependency, but it’s not suited for homeowners seeking remote access or energy monitoring for heat-only systems.
Pros:- Reliable 5-2 day programmable scheduling
- Large, clear backlit display for easy reading
- Simple installation with Honeywell UWP wall plate
- Change air filter reminders support HVAC maintenance
Cons:- Batteries are not included, requiring extra purchase
- Not compatible with electric baseboard heat (120-240V)
- Lacks Wi-Fi for remote control or energy monitoring
Best for: Budget-conscious users with simple, heat-only systems who want basic programmable control
Not ideal for: Tech-savvy users or those wanting remote control features and energy reports
- Model:X2P (RTH20B)
- Color:White
- Scheduling:5-2 day programmable
- Display:Large backlit
- Compatibility:1 Heat/1 Cool, 750 mV, hot water, forced air
- Incompatible:Electric baseboard heat
- Power:2 AA batteries (not included)
Our verdict“This thermostat offers straightforward scheduling for traditional systems at an affordable price, ideal for basic heat-only setups.”
Google Nest Thermostat – Smart Programmable Wi-Fi Thermostat (Snow)
The Google Nest Thermostat (Snow) is well-suited for homeowners seeking a balance of smart features and energy efficiency. It automatically adjusts settings when you leave home and learns schedules over time, which can reduce energy use significantly. Its compatibility with Google Assistant, Alexa, and Matter-certified devices broadens its voice control options, making it flexible for various smart home ecosystems. Compared with the Sensi Lite ST25, it offers more advanced learning and remote features, but it may require a C-wire or a power accessory for heat-only systems, which could add complexity. This thermostat is ideal for those who want a sleek, intelligent device that adapts to their routines and supports multiple voice platforms but are prepared to handle wiring considerations.
Pros:- Automatically adjusts settings to save energy when away
- Remote control via Google Home app supports multiple devices
- Supports voice commands through Google Assistant, Alexa, and Matter
- Provides HVAC alerts and maintenance reminders
Cons:- Requires a C-wire or power accessory for some heat-only systems
- No lock feature to restrict temperature changes
- Some setup complexity if wiring isn’t compatible
Best for: Homeowners with heat-only systems interested in automated, energy-efficient control within a smart home setup
Not ideal for: Users without a C-wire or those preferring simple, manual thermostats without learning capabilities
- Brand:Google Nest
- Color:Snow
- Certification:ENERGY STAR
- Connectivity:Wi-Fi
- C Wire Required:In most homes, yes
- App:Google Home
- Energy Savings:Automatic eco mode when away
Our verdict“This thermostat is best for users who want an intelligent, adaptive control that integrates smoothly with a smart home ecosystem for heat-only systems.”
Sensi Lite Smart Thermostat, WiFi, DIY, Alexa, Energy Star Certified
The Sensi Lite Smart Thermostat (WiFi, DIY) version emphasizes privacy and ease of installation, making it suitable for users who want to control energy costs without sacrificing data security. Its compatibility with most HVAC systems requiring a common wire ensures broad applicability, especially for heat-only setups. The energy-saving features like scheduling and geofencing help reduce costs by around 23%. In comparison to the Honeywell X2P, it offers more modern remote control via a mobile app, but still requires a C-wire for many systems, which can be a hurdle for some homeowners. This thermostat is best for privacy-conscious DIYers who want a straightforward, Wi-Fi-connected device for heat-only systems.
Pros:- Easy DIY installation with step-by-step instructions
- Energy savings of about 23% through scheduling and geofencing
- Remote control via a mobile app for convenience
- Strong privacy protection—no data sold
Cons:- Requires a common wire for most HVAC systems
- Limited compatibility with systems without C-wire
- Basic smart features—no voice control or learning capabilities
Best for: Privacy-focused homeowners comfortable with DIY installation and using heat-only systems
Not ideal for: Users with systems lacking a common wire or those seeking advanced smart features like learning or voice control
- Connectivity:WiFi
- Compatibility:Most HVAC with common wire
- Energy Savings:Approximately 23%
- Certification:Energy Star
- Control:Mobile app (Android and iOS)
- Privacy:Data not sold to third parties
Our verdict“This thermostat suits privacy-aware DIY users needing reliable heat-only control with Wi-Fi connectivity and energy savings.”
ecobee Smart Thermostat Essential – WiFi Thermostat, Energy Star Certified
The ecobee Smart Thermostat Essential stands out for its ability to help homeowners save up to 23% annually on heating costs by intelligently adjusting to your schedule. It offers a bright color touchscreen and compatibility with major smart home platforms like Apple HomeKit, Google Assistant, and Alexa, making it highly adaptable. Unlike the Honeywell RTH9585WF, which has a larger, more traditional display, the ecobee provides smart sensors for room-specific comfort, though these are sold separately. Its DIY installation is straightforward, even for homes without a C-wire, but an optional Power Extender Kit is needed for some setups. This makes it suitable for tech-savvy users seeking flexible integration and energy management. The limited app feature details may leave some wanting more control via the app compared to Amazon’s more integrated Alexa experience. Overall, this pick is ideal for those who want a budget-friendly, compatible, and energy-efficient smart thermostat without sacrificing smart home integration.
Pros:- Helps reduce heating and cooling costs by up to 23% annually
- Easy DIY installation with no C-wire required (Power Extender Kit optional)
- Compatible with major smart home ecosystems including Apple HomeKit, Google Assistant, and Alexa
- Includes smart sensors for room-specific temperature control
Cons:- Requires an optional Power Extender Kit for homes lacking a C-wire
- SmartSensor pack sold separately, adding to overall cost
- Limited detail on app controls may frustrate power users
Best for: Homeowners seeking broad smart home compatibility and energy savings with easy DIY installation.
Not ideal for: Users without a C-wire who prefer all-in-one sensors included in the package or less DIY setup complexity.
- Compatibility:Most 24 VAC HVAC systems, including gas, oil, electric, dual fuel, and heat pump
- Connectivity:WiFi
- Energy Star Certified:Yes
- SmartFeatures:Indoor humidity detection, schedule assistant, time of use
- Installation:DIY, no C-wire needed (Power Extender Kit sold separately)
Our verdict“This thermostat is best for users who want versatile smart home compatibility and energy savings without complicated installation.”
Amazon Smart Thermostat – Works with Alexa and Ring, C-Wire Required
The Amazon Smart Thermostat offers a straightforward way to reduce energy costs, with an EPA estimate of saving around $90 annually. Its seamless Alexa integration allows for automatic temperature adjustments via voice commands and remote control through the Alexa app, making it ideal for Amazon ecosystem users. Compared to the ecobee, which supports multiple platforms, this thermostat focuses heavily on Alexa, limiting cross-platform flexibility. Installation is guided by the Alexa app, but it requires a C-wire, which may be a barrier for some homes. Its simple interface and reliable Honeywell technology make it an appealing choice for those who prioritize ease of use and voice control. However, those using other smart home systems or lacking a C-wire might find this option less suitable. This model is perfect for Amazon fans wanting a reliable, easy-to-install smart thermostat that saves money.
Pros:- Saves an estimated $90 per year on energy bills
- Remote monitoring and control via Alexa app
- Guided DIY installation with customer support
- Built on trusted Honeywell technology
Cons:- Requires a C-wire, which may not be available in all homes
- Limited compatibility outside the Alexa ecosystem
- Focus on Alexa may exclude users of other platforms
Best for: Owners with existing Alexa devices who want simple setup and remote control features.
Not ideal for: Homeowners without a C-wire or those using non-Alexa smart home platforms seeking broader compatibility.
- Brand:Amazon
- Compatibility:Alexa, Ring
- Certification:ENERGY STAR
- Technology:Honeywell Home Thermostat Technology
- Installation:DIY guided by Alexa app
- C-Wire:Required
Our verdict“This thermostat suits Alexa users who want a straightforward, cost-effective way to control their heating remotely.”
Honeywell Home X2S Smart Wi-Fi Thermostat, Gray
The Honeywell Home X2S provides a versatile control platform with support for Matter, Amazon Alexa, Google Assistant, and Apple HomeKit, making it a top choice for those with complex smart home setups. Its flexible scheduling, auto-away, and humidity monitoring deliver precise comfort management. Compared with the ecobee Essential, the X2S emphasizes integration with multiple ecosystems, although it requires a C-wire for reliable operation, which could be a limitation for homes without wiring upgrades. The 2-year warranty and energy-saving features add to its appeal, especially for users who want a future-proof device. However, its reliance on a C-wire and specific HVAC configurations means it’s less suitable for older or simpler systems. This model makes the most sense for users who value comprehensive ecosystem support and advanced comfort features.
Pros:- Works with Matter, Alexa, Google Assistant, and Apple HomeKit for broad compatibility
- Flexible scheduling options and auto-away feature improve efficiency
- Includes humidity display and filter reminders for better comfort and maintenance
- Energy Star certified with potential rebate opportunities
Cons:- Requires a C-wire, which may not be compatible with all homes
- Limited to specific HVAC configurations, possibly requiring an adapter
- Higher complexity might be intimidating for some DIY installers
Best for: Homeowners with existing smart home ecosystems and compatible HVAC systems seeking advanced scheduling and humidity control.
Not ideal for: Homes lacking a C-wire or with incompatible HVAC setups that cannot support this model’s wiring needs.
- Model:X2S
- Color:Gray
- Connectivity:Wi-Fi
- App:First Alert
- SmartHome Compatibility:Matter, Amazon Alexa, Google Assistant, Apple HomeKit
- Power Requirement:C-wire required
- HVAC Support:Up to 2 heat / 2 cool or 2 heat / 1 cool heat pump
- Warranty:2 years
Our verdict“Ideal for tech-savvy homeowners wanting smart ecosystem integration and advanced comfort features in their heat-only system.”
Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat, 7-Day Programmable, Touch Screen, Gray
The Honeywell Home RTH9585WF offers a visually appealing, customizable touch screen with vibrant color options, making it a flexible choice for style-conscious homeowners. Its 7-day programmable schedule and compatibility with Alexa and Google Home provide remote control options, similar to the ecobee Essential but with a more traditional interface. Unlike the ecobee, which emphasizes sensor-based control, this model focuses on detailed scheduling and aesthetic flexibility. It supports a range of HVAC systems, including forced air, hot water, steam, and heat pumps, but excludes electric baseboard heating, similar to the other models in this roundup. The C-wire requirement may limit installation options, especially in older homes. Its customizable display and detailed scheduling are excellent for users who want both style and control, but limited smart home ecosystem options may be a drawback for some. This thermostat is well-suited for those prioritizing visual customization and detailed programming.
Pros:- Color touch screen with customizable display to match home décor
- Works with Alexa and Google Home for remote voice control
- Flexible 7-day programming and energy reports for savings
- Supports multiple HVAC types including hot water and steam
Cons:- Requires a C-wire, which might not be available in all installations
- Limited compatibility with electric baseboard systems
- Less integration with broader smart home platforms beyond Alexa and Google
Best for: Design-conscious homeowners seeking customizable display options and detailed weekly scheduling.
Not ideal for: Homes without a C-wire or users who prefer a generalized smart home platform beyond Alexa and Google Assistant.
- Brand:Honeywell Home
- Model:RTH9585WF
- Color:Gray
- Connectivity:Wi-Fi
- Programmability:7-Day
- Display:Touch Screen
- Compatibility:Amazon Alexa, Google Home
- C-Wire Required:Yes
Our verdict“Best for homeowners who value personalized display options and detailed weekly scheduling with reliable remote control.”
How We Picked
In selecting these smart thermostats for heat-only systems, I focused on performance reliability, ease of installation, and compatibility with heat-only setups. I prioritized models that support common heating systems without cooling, especially those requiring a C-wire or offering power options. Usability and setup process played a big role, since many buyers prefer straightforward installation. I also considered smart features such as voice control, app integration, and automation capabilities, ensuring they add real value for heat-only systems. The ranking reflects a balance of these factors, favoring products that deliver consistent operation and smart home compatibility without unnecessary complexity or cost.| smart thermostats for heatonly system | Connectivity |
|---|---|
| ecobee Smart Thermostat Premiu | — |
| Honeywell Home X7S Smart Wi-Fi | Wi-Fi, 2.4/5 GHz |
| Smart Wi-Fi Thermostat for Sin | — |
| Honeywell Home RTH9600WF Smart | Wi-Fi |
| Sensi Smart Thermostat ST55 | Wi-Fi |
| Sensi Lite Smart Thermostat ST | WiFi |
| Honeywell Home X2P Programmabl | — |
| Google Nest Thermostat | Wi-Fi |
| Sensi Lite Smart Thermostat | WiFi |
| ecobee Smart Thermostat Essent | WiFi |
| Amazon Smart Thermostat | — |
| Honeywell Home X2S Smart Wi-Fi | Wi-Fi |
| Honeywell Home RTH9585WF Wi-Fi | Wi-Fi |
