Buying guide9 products tested
The 9 Best Smart Thermostats for Heat Pumps in 2026: Maximize Efficiency & Savings
Find the best smart thermostats for heat pump systems in 2026. Our top picks offer aux heat lockout, balance point settings, ENERGY STAR certification, and utility rebate eligibility.
By David Sinclair, Managing Editor · Reviewed by Catherine Hayes
Updated March 24, 2026Reviewed by Catherine Hayes, Senior Editor, Home & Appliances on March 24, 202614 min read
Affiliate disclosure: We may earn a commission when you buy through links on this page. This never changes which products we recommend — every pick is chosen by our editorial team, and our methodology is documented in our review methodology.
Our top pick
ecobee Smart Thermostat Premium
Best-in-class heat pump staging controls, ENERGY STAR certified for up to 26% annual savings, includes SmartSensor for multi-room comfort, and built-in air quality monitoring
Not All Smart Thermostats Are Built for Heat Pumps - Here's What Actually Works#
What is the best smart thermostat for a heat pump?
The ecobee Smart Thermostat Premium ($339.98) is the best smart thermostat for most heat pump systems - it offers superior heat pump staging controls, ENERGY STAR certification for utility rebates, and multi-room SmartSensor technology. The Google Nest Learning Thermostat (4th gen) at $279.99 is the best alternative for auto-learning capability and no-C-wire installation.
If you've recently made the switch to a heat pump - or you've had one for years without optimizing your controls - your thermostat choice has an outsized impact on efficiency and comfort. Unlike gas furnaces that generate heat on demand, heat pumps move heat from outdoors to indoors through a refrigeration cycle. That fundamental difference means a thermostat designed for gas heat will mismanage your system: it may trigger expensive auxiliary resistance heat when the compressor could have handled the load, or fail to configure the outdoor temperature threshold at which backup heat should activate.
The consequences aren't abstract. Unnecessary auxiliary heat usage - triggered by a thermostat that doesn't understand balance points - can add hundreds of dollars to your annual energy bill. Meanwhile, heat pump owners who upgraded under the Inflation Reduction Act's 30% tax credit [5] are leaving efficiency on the table without a compatible smart thermostat to govern the system. The right thermostat completes the investment; the wrong one undermines it.
We evaluated nine smart thermostats specifically for heat pump operation, prioritizing models with dedicated balance point configuration, auxiliary heat lockout settings, multi-stage support, and ENERGY STAR certification for utility rebate eligibility [1]. Here's what we found - including picks for every budget, from $51.99 to $339.98.
Best Smart Thermostats for Heat Pumps - Quick Comparison
| Product | Price | Best For | ENERGY STAR | Room Sensors |
|---|---|---|---|---|
| ecobee Smart Thermostat Premium | $339.98 | Best Overall | Yes | Included |
| Google Nest (4th gen) | $279.99 | Auto-Learning | Yes | Included |
| Trane XL824 | $265.99 | Trane Systems | No | No |
| Honeywell Home T9 | $209.99 | Multi-Room | Yes | 1 Included |
| Sensi Touch 2 | $203.98 | Value Bundle | Yes | Included |
| Honeywell RTH9585WF | $179.99 | Color Display | Yes | No |
| Honeywell T6 Pro Z-Wave | $51.99 | Most Affordable | No | No |
1. ecobee Smart Thermostat Premium - Best Overall#
Best for: Heat pump owners who want maximum efficiency, multi-room comfort control, and comprehensive smart home integration
№ 1
ecobee Smart Thermostat Premium
4.8$279.99$339.98Save 18%
The gold standard for heat pump smart thermostats. ecobee's Premium delivers unmatched staging controls, ENERGY STAR savings up to 26% per year, and a built-in air quality monitor that no competing thermostat at this price point matches.
What we like
- Best-in-class heat pump staging with configurable balance point and auxiliary heat lockout
- ENERGY STAR certified - save up to 26% annually on heating and cooling costs
- Included SmartSensor ($50 value) adjusts for room-by-room temperature comfort
- Built-in air quality monitor with filter change reminders for heat pump efficiency
- Built-in Amazon Alexa and Apple Siri - no separate smart speaker required
- Bundle includes SmartSensor for Doors and Windows 2-Pack for security integration
What we don’t
- At $339.98, the highest-priced option in our roundup
- Feature-rich configuration has a steeper learning curve than competitors
- Typically requires a C-wire or the included Power Extender Kit for reliable power
value8.0
smart_features10.0
ease_of_install9.0
heat_pump_support10.0
The Pitch
ecobee positions the Smart Thermostat Premium as a complete home intelligence hub. The bundle includes the thermostat itself, a SmartSensor valued at $50, and a SmartSensor for Doors and Windows 2-Pack for home entry monitoring. The headline efficiency claim - savings of up to 26% per year on heating and cooling compared to a constant 72°F hold - applies specifically to heat pump households when the advanced staging and scheduling features are properly configured.
The Experience
For heat pump owners, the ecobee Premium delivers where it matters most: granular staging control. You can set precise balance point temperatures to define exactly when auxiliary heat activates, preventing expensive resistance heat from running when outdoor temperatures are still within the compressor's efficient operating range. The SmartSensor technology monitors temperature in occupied rooms - not just at the thermostat location - dramatically reducing hot and cold spots common in single-zone heat pump homes. The built-in air quality monitor adds genuine practical value, alerting you when indoor air quality degrades and sending filter change reminders that protect your heat pump's airflow efficiency over time.
The Catch
The $339.98 price will give budget-conscious shoppers pause. The included door and window sensors add value for homeowners who want security integration, but if you don't need that, you're paying for capability you won't use. The ecobee's configuration menus - particularly the heat pump advanced settings - are more complex than competitors like the Nest, and some users may need to spend time in documentation to unlock the full optimization features.
Before you buy
The $339.98 list price is steep, but ENERGY STAR certification means utility rebates frequently reduce the effective cost to $200 or less. Always check dsireusa.org for your state's available thermostat rebates before purchasing.
The ecobee Smart Thermostat Premium earned its top spot through genuinely superior heat pump support. The balance point configuration lets you define the outdoor temperature threshold below which auxiliary heat becomes cost-effective for your specific system. For most heat pumps, this falls between 30°F and 35°F, but the ideal threshold depends on your unit's rated COP, your local electricity rates, and your backup heat type. No other non-communicating thermostat in this roundup provides this level of control [4].
The bundled SmartSensor is a real efficiency differentiator. Heat pumps often struggle to maintain even temperatures across different rooms due to lower airflow velocity compared to gas furnaces. By placing the SmartSensor in the bedroom or living room, the ecobee prioritizes comfort where it actually matters. Room sensor integration can reduce HVAC energy use by up to 23% compared to single-point thermostat control - a significant gain for heat pump households already paying attention to efficiency.
2. Google Nest Learning Thermostat (4th Gen) - Best for Hands-Free Learning#
№ 2Best Auto-LearningNo C-Wire Required
Google Nest Learning Thermostat (4th gen) + Nest Temperature Sensor (2nd gen)
4.6$239.99$279.99Save 14%
Google's 4th-gen Nest is the most seamless heat pump thermostat for users who want intelligent optimization without configuration complexity. The auto-learning schedule and bundled temperature sensor deliver real efficiency gains from day one.
What we like
- Learns your schedule automatically within the first week - no manual programming needed
- No C-wire required in most homes for simplified installation
- Bundled Nest Temperature Sensor (2nd gen) provides immediate multi-room capability
- Matter compatible for future-proof smart home integration
- Works with Alexa, Siri, and Google Assistant natively
- Heat Pump Balance mode optimizes when auxiliary heat activates
What we don’t
- Less granular heat pump configuration than ecobee - no manual balance point setting
- Cloud-dependent features require stable internet for full functionality
- Silver finish limits color matching options
The Google Nest Learning Thermostat (4th gen) at $279.99 bundles the thermostat with a Nest Temperature Sensor (2nd gen), immediately making it competitive with the ecobee for multi-room comfort at a lower price point. The defining feature remains Auto-Schedule: the Nest analyzes your manual temperature adjustments over the first week and constructs a personalized heating and cooling schedule without requiring any programming from you [2].
For heat pump users, the 4th-gen Nest's Heat Pump Balance mode is the headline efficiency feature. The thermostat continuously monitors outdoor temperatures and your system's efficiency curve to determine when running the compressor longer at lower output is more economical than triggering auxiliary heat - preventing the short-cycling that wastes energy. The confirmed no-C-wire installation in most homes is also a practical advantage for older heat pump installations that pre-date C-wire standards. The 4th gen also gains Matter compatibility, ensuring clean integration with future smart home upgrades.
3. Honeywell Home T9 - Best for Multi-Room Temperature Control#
№ 3Best Multi-RoomENERGY STAR Certified
Honeywell Home T9 WiFi Smart Thermostat
4.5$187.49$209.99Save 11%
The Honeywell T9 is the right pick for heat pump owners who prioritize multi-room comfort. The 200ft sensor range outperforms competitors in larger homes, and ENERGY STAR certification keeps utility rebates accessible.
Check price at AmazonOnly 3 left in stock - order soon.
What we like
- Includes 1 Smart Room Sensor with industry-leading 200ft wireless range
- ENERGY STAR certified for utility rebate eligibility
- Auto Home/Away geofencing adapts to your presence automatically
- Focus Comfort prioritizes conditioning in occupied rooms
- Compatible with dual-fuel heat pump systems including gas backup
- Clean, intuitive touchscreen interface
What we don’t
- App reliability has received mixed feedback in recent user reviews
- Heat pump staging controls less granular than ecobee
- Additional room sensors are a separate purchase
The Honeywell Home T9 WiFi Smart Thermostat takes a complementary approach to heat pump optimization: rather than fine-tuning auxiliary heat thresholds, it focuses on reducing how often the system needs to work hard in the first place. The Smart Room Sensor technology uses a proprietary Honeywell protocol achieving up to 200ft range - a meaningful advantage in two-story or open floor plan homes where competing systems lose signal reliability.
The Focus Comfort feature integrates with the room sensor to ensure the heat pump conditions the spaces where people actually are, rather than averaging across empty rooms. In practice, this means the bedroom can be held cooler overnight while the living room maintains daytime comfort - reducing total system runtime without sacrificing the comfort that matters. The T9's geofencing-based Auto Home/Away mode further reduces wasted conditioning when the home is unoccupied.
4. Sensi Touch 2 - Best Value Bundle with Room Sensor#
№ 4Best Value BundlePrivacy First
Sensi Touch 2 Smart Thermostat & Sensi Room Sensor New 2023!
4.4$195.98$203.98Save 4%
The Sensi Touch 2 bundle at $203.98 delivers excellent value for heat pump owners who need ENERGY STAR certification, a room sensor, and principled privacy practices. Emerson's data transparency commitment genuinely stands out.
What we like
- Bundle includes Sensi Room Sensor for multi-room comfort out of the box
- ENERGY STAR certified - Emerson claims up to 23% HVAC energy savings
- Explicit privacy commitment: Sensi will not sell your personal data to third parties
- Flexible scheduling with remote access via the Sensi app
- Eligible for utility demand response programs for additional savings
- Updated 2023 design with improved touchscreen
What we don’t
- Heat pump staging controls less sophisticated than ecobee or Nest
- Sensi app ecosystem smaller than Google or Honeywell platforms
- No built-in voice assistant; requires separate Alexa or Google Home device
The Sensi Touch 2 Smart Thermostat at $203.98 - bundled with the Sensi Room Sensor - is one of the stronger value propositions in the heat pump thermostat market. The 2023-updated model includes improved heat pump staging support with 2-stage compatibility and an auxiliary heat lockout threshold, covering the majority of residential heat pump configurations. Emerson's ENERGY STAR certification and claimed 23% HVAC energy savings align closely with EPA estimates for smart thermostats used with proper scheduling and remote access.
The Sensi Touch 2's defining differentiator is Emerson's commitment to not selling user personal data to third parties - a meaningful policy in a market where most smart home device manufacturers treat behavioral and usage data as a revenue stream. For privacy-conscious homeowners who are otherwise comfortable with a cloud-connected thermostat, this stance is genuinely noteworthy. The remote access features and usage reports work through the Sensi app, which functions reliably if without the feature depth of the Nest or ecobee platforms.
5. Trane XL824 Nexia Control - Best for Trane Communicating Heat Pumps#
№ 5Best for Trane SystemsCommunicating Protocol
Trane XL824 Nexia Control
4.3$265.99
If you own a Trane variable-speed or communicating heat pump, the XL824 unlocks efficiency levels that no generic smart thermostat can approach. For non-Trane systems, one of the Wi-Fi options above will serve you better.
Check price at AmazonOnly 1 left in stock - order soon.
What we like
- Native communicating protocol for Trane variable-speed heat pump systems
- Up to 5 heating stages and 2 cooling stages for maximum efficiency modulation
- Dual-fuel system support for heat pump plus gas furnace integration
- Nexia platform enables remote monitoring and control from anywhere
- Color touchscreen with intuitive navigation
- Unlocks advanced efficiency modes unavailable with generic thermostats
What we don’t
- Limited practical value outside of Trane HVAC systems
- Nexia platform adds subscription costs for full remote access
- At $265.99, expensive for a brand-specific product
- Very limited availability - verify stock before ordering
The Trane XL824 Nexia Control at $265.99 occupies a specialized position in this roundup: it's a communicating thermostat built to interface directly with Trane's heat pump systems via the ComfortLink II protocol. For standard heat pump installations, a communicating thermostat is optional - but for Trane variable-speed compressor systems, it's transformative. The proprietary protocol enables the XL824 to modulate compressor speed continuously, operate at efficiency levels that binary on/off control can't achieve, and receive real-time diagnostic data from the heat pump itself [4].
The support for up to 5 heating stages and 2 cooling stages gives Trane multi-stage systems the granular control they were designed for. A generic smart thermostat connecting to the same Trane hardware would force it to operate in simplified on/off mode, forfeiting most of the variable-speed efficiency advantage. The dual-fuel capability is also critical for Trane installations with gas furnace backup: the XL824 manages the switchover between heat pump and gas heat based on configurable outdoor temperature lockout settings.
6. Honeywell Home RTH9585WF - Best Mid-Range with Customizable Color Display#
№ 6ENERGY STAR CertifiedColor Display
Honeywell Home RTH9585WF1004 Wi-Fi Smart Color Thermostat
4.3$119.99$179.99Save 33%
The Honeywell RTH9585WF at $179.99 delivers reliable heat pump support, ENERGY STAR certification, and a customizable color display. It's the right choice for single-stage heat pump installations where simplicity and rebate eligibility are the priorities.
What we like
- ENERGY STAR certified for utility rebate eligibility
- Customizable color display to match your home decor
- Alexa Ready for voice control without additional hardware
- Flexible 7-day programming with multiple daily periods
- Compatible with utility demand response programs
- Proven heat pump compatibility for single-stage systems
What we don’t
- No room sensor support - single-zone comfort only
- Heat pump staging limited to basic single-stage operation
- No auto-learning or geofencing features
- Honeywell Total Connect Comfort app is functional but unpolished
The Honeywell Home RTH9585WF1004 Wi-Fi Smart Color Thermostat at $179.99 fills an important midmarket position: ENERGY STAR certified, Wi-Fi connected, Alexa Ready, and equipped with flexible 7-day programming at a price point where utility rebates are particularly impactful. For single-stage heat pump installations in apartments, condos, or smaller homes where room sensor complexity isn't needed, the RTH9585WF delivers everything essential without requiring configuration expertise.
The color display customization is a quality-of-life feature easy to dismiss but genuinely appreciated in daily use. More practically, the utility demand response program eligibility means you can enroll with your energy provider to receive credits for allowing slight temperature adjustments during grid peak demand periods - potentially earning back part of the purchase price annually. Combined with ENERGY STAR rebates, the RTH9585WF's effective cost in many states drops well below its $179.99 retail price.
7. Honeywell T6 Pro Z-Wave - Most Affordable Smart Option#
№ 7Most AffordableZ-Wave Compatible
Honeywell TH6320ZW2003 T6 Pro Series Z-Wave Stat Thermostat &
4.1$51.99
The Honeywell T6 Pro Z-Wave at $51.99 only makes sense for homes with an existing Z-Wave hub. Without one, the hub requirement erases the price advantage. The lack of ENERGY STAR certification also removes utility rebate savings that make competing thermostats more cost-effective long term.
Check price at AmazonOnly 1 left in stock - order soon.
What we like
- Most affordable option in this roundup at $51.99
- Z-Wave integration works with SmartThings, Hubitat, and compatible Z-Wave hubs
- Cycle learning adapts to your heat pump's startup and recovery timing
- Configurable minimum cooling and maximum heating temperature limits
- Reliable heat pump compatibility for standard single-stage systems
- Simple interface for users who prefer minimal app dependency
What we don’t
- Requires a Z-Wave hub - not standalone Wi-Fi
- No ENERGY STAR certification - ineligible for most utility rebates
- Smart features hub-dependent; limited without one
- No room sensor support
- Very limited availability - only 1 unit currently in stock
The Honeywell TH6320ZW2003 T6 Pro Series Z-Wave Stat Thermostat at $51.99 is the lowest-priced option in this roundup by a wide margin - but that headline price comes with a significant asterisk. The T6 Pro Z-Wave is not a standalone Wi-Fi device. It requires a Z-Wave compatible smart home hub to unlock its smart features. If you already have SmartThings or Hubitat in your home, the T6 Pro integrates cleanly and provides reliable single-stage heat pump control. If you don't, add the hub cost to your calculation.
The cycle learning feature is the T6 Pro's most practical differentiator from basic programmable thermostats. By learning your heat pump's startup timing and recovery period, it adjusts when it begins a heating cycle to hit your target temperature at the right time rather than after it. This matters for heat pump users because temperature overshoot - which causes the compressor to shut off followed by a rapid temperature drop - is exactly the kind of inefficient cycling that drives unnecessary auxiliary heat use. A functional but limited option best suited to renters or existing Z-Wave households on tight budgets.
How to Choose the Right Smart Thermostat for Your Heat Pump#
Shopping for a heat pump thermostat is meaningfully different from shopping for a gas furnace controller. Most smart thermostat brands prominently advertise heat pump compatibility, but compatibility and optimization are very different standards. Here's what to evaluate before purchasing.
Know Your Heat Pump Type
Single-stage heat pumps work reliably with every thermostat in this roundup. Two-stage heat pumps need a thermostat that supports a second compressor stage terminal (Y2). Variable-speed or inverter-driven heat pumps require a communicating thermostat to access their full efficiency range; without one, these systems operate in simplified on/off mode, sacrificing the efficiency gains that justify the system's higher cost [4]. Dual-fuel systems (heat pump with gas backup) need a thermostat with outdoor temperature lockout - without it, the gas furnace may run when the heat pump should handle the load.
Balance Point and Auxiliary Heat Lockout
The balance point is the outdoor temperature at which your heat pump's operating cost per BTU equals your backup heat's cost per BTU. Above that temperature, your heat pump runs alone; below it, auxiliary heat becomes cost-competitive. Configuring this threshold manually - as the ecobee allows - can save significantly more than a thermostat using a preset or automatic threshold. Look specifically for 'balance point,' 'auxiliary heat lockout temperature,' or 'minimum outdoor temperature for AUX heat' in the thermostat specifications.
ENERGY STAR Certification and Rebates
ENERGY STAR certified smart thermostats save an average of $50 per year on energy costs according to EPA data [1], but the immediate rebate eligibility often matters more at purchase time. Utility rebates of $50 to $150 are available in most states for ENERGY STAR certified thermostats, effectively reducing the purchase price. A $50 rebate on the Sensi Touch 2 brings it to $153.98; the same rebate on the ecobee Smart Thermostat Premium brings it to $289.98.
C-Wire and Installation Requirements
Most smart thermostats require a C-wire (common wire) for continuous 24V power to maintain Wi-Fi and display operation. The Google Nest Learning Thermostat (4th gen) is the notable exception - it works without a C-wire in most installations through an internal power management system. If you're unsure about your wiring, use the manufacturer's compatibility checker before purchasing. ecobee includes a Power Extender Kit for C-wire-less installations, and the Sensi Touch 2 also supports PEK wiring configurations.
- Confirm your heat pump's staging type: single-stage, 2-stage, variable-speed, or dual-fuel
- Look for dedicated aux heat lockout and balance point settings - 'heat pump compatible' alone isn't enough
- Verify C-wire presence at thermostat location, or choose a no-C-wire model like the Nest 4th gen
- Check ENERGY STAR certification and search dsireusa.org for state and utility rebates
- Consider room sensor support if your home has temperature imbalances between floors or zones
- For variable-speed communicating systems, use the manufacturer's communicating thermostat
- Confirm smart home platform compatibility: Google Home, Amazon Alexa, Apple HomeKit, or Matter
Frequently Asked Questions#
Frequently Asked Questions
Can I use any smart thermostat with a heat pump system?
Not all smart thermostats are optimized for heat pump operation. While most modern Wi-Fi thermostats support heat pump wiring (including the O/B reversing valve terminal), genuine heat pump optimization requires specific features: a configurable balance point temperature, an auxiliary heat lockout threshold, and multi-stage support. Always verify a thermostat explicitly supports your heat pump's staging type. Variable-speed and communicating heat pumps specifically require the manufacturer's communicating thermostat to operate at full efficiency.
What is a balance point setting and why does it matter for heat pump efficiency?
The balance point is the outdoor temperature at which running your heat pump costs the same per BTU of heat delivered as running your auxiliary backup heat. Above the balance point, the heat pump should run alone; below it, auxiliary heat may be more cost-effective depending on your electricity and gas rates. A thermostat that lets you configure this threshold manually - such as the ecobee Smart Thermostat Premium - prevents unnecessary auxiliary heat activation in moderately cold weather, potentially saving hundreds of dollars annually. For most residential heat pumps, the balance point falls between 25°F and 40°F.
Do smart thermostats work with dual-fuel heat pump and gas furnace systems?
Yes, but you need a thermostat specifically designed for dual-fuel operation. The Trane XL824 and Honeywell Home T9 in this roundup both support dual-fuel configurations. A proper dual-fuel thermostat manages two heating sources - the heat pump compressor for moderate cold and the gas furnace for severe cold - using an outdoor temperature lockout setting that defines the switchover point. Without this feature, both systems may compete inefficiently or the gas furnace may run when the heat pump is the lower-cost option.
Which thermostats in this roundup are ENERGY STAR certified and eligible for utility rebates?
The ENERGY STAR certified thermostats in this roundup are: ecobee Smart Thermostat Premium (B0B1X7G9J2), Google Nest Learning Thermostat 4th gen (B0D5BGST5N), Honeywell Home T9 (B07N849J21), Sensi Touch 2 (B0C5BDWY94), and Honeywell Home RTH9585WF (B075BF6V58). The Trane XL824 and Honeywell T6 Pro Z-Wave do not carry ENERGY STAR certification. Visit dsireusa.org or your utility provider's rebate portal to find available incentives in your state - rebates of $50 to $150 are common for certified models.
What is the difference between a communicating and non-communicating heat pump thermostat?
A communicating thermostat uses a proprietary two-way digital protocol (such as Trane ComfortLink II or Lennox iComfort) to exchange real-time performance data with the HVAC system. This enables continuous modulation of variable-speed compressors, system health diagnostics, and efficiency optimizations not possible through standard 24V control wiring. A non-communicating thermostat - even an advanced Wi-Fi model like the ecobee or Google Nest - controls equipment only through binary on/off voltage signals. For standard single-stage and 2-stage heat pumps, non-communicating thermostats are fully adequate. Variable-speed systems need communicating thermostats to unlock full efficiency.
How much can a smart thermostat save annually when paired with a heat pump?
EPA ENERGY STAR estimates average annual savings of $50 per year for smart thermostats. In practice, savings depend heavily on prior thermostat usage, climate zone, and whether you use room sensors and scheduling. Homes upgrading from manual or basic programmable thermostats often see $100 to $200 in annual savings. ecobee's published data claims up to 26% savings on heating and cooling annually compared to a constant 72°F hold - which, on a typical $1,200 annual HVAC bill, represents approximately $312 per year. Room sensor integration adds a documented 10 to 23% additional efficiency improvement in multi-room homes.
Do I need a C-wire to install a smart thermostat on a heat pump?
Most smart thermostats prefer a C-wire for continuous power supply to maintain Wi-Fi and display operation. However, the Google Nest Learning Thermostat (4th gen) works without a C-wire in most homes through its built-in power management system. If you lack a C-wire, the ecobee includes a Power Extender Kit (PEK) that derives power from existing wiring, and the Sensi Touch 2 also supports PEK configurations. Before purchasing any thermostat, use the manufacturer's online compatibility checker - most will confirm C-wire requirements for your specific wiring setup.
Will a smart thermostat void my heat pump warranty?
In most cases, installing a compatible smart thermostat from a reputable manufacturer does not void your heat pump warranty. However, using a standard non-communicating thermostat on a system specifically designed for communicating control - bypassing the manufacturer's protocol - could affect warranty claims related to system performance or efficiency ratings. For new variable-speed heat pump installations still under warranty, using the manufacturer's recommended communicating thermostat is the safest approach. When in doubt, consult your HVAC installer or the heat pump manufacturer's warranty documentation.
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