Best Smart Thermostats to Lower Your Energy Bill in 2025

Fact-checked by the SnapMessages editorial team

Updated July 2026

The best smart thermostats combine adaptive scheduling, remote control, and energy reporting to cut household utility costs without sacrificing comfort. According to the U.S. Environmental Protection Agency (ENERGY STAR), smart thermostats certified under their program deliver an average annual savings of 8% on heating and cooling bills, with a minimum guaranteed reduction of ≥ 8% for heating and ≥ 10% for cooling.

With energy prices continuing to climb in 2025, upgrading to a smart thermostat is one of the highest-ROI home tech investments available right now. On average, users save $50 per year with ENERGY STAR-certified models, a figure backed by the same agency.

Which Smart Thermostats Save the Most Energy?

The Google Nest Learning Thermostat and Ecobee Smart Thermostat Premium consistently top independent energy-saving benchmarks. Both use occupancy sensing and machine learning to build a heating and cooling schedule around your actual behavior, not a preset you manually program.

Ecobee’s SmartSensor technology monitors multiple rooms simultaneously, preventing the system from wasting energy conditioning spaces no one is using. According to ENERGY STAR, the average reduction in HVAC runtime from certified smart thermostats is at least 8% for heating and 10% for cooling, meeting the minimum standard for certification.

If you heat with natural gas in a cold-weather state like Minnesota, the 5% gas savings observed in the Northwest study translates to roughly $40 to $60 in annual savings for a typical home, based on average residential gas prices in the region. That’s enough to cover the cost of a budget thermostat within two years, even before factoring in any cooling savings.

Nest Learning Thermostat vs. Ecobee Premium

Google Nest learns your schedule within one week and adjusts automatically. Ecobee requires a slightly more hands-on setup but rewards users with deeper room-by-room data. Both integrate with Amazon Alexa, Google Assistant, and Apple HomeKit, though Ecobee’s HomeKit support is more robust out of the box.

What Features Matter Most in a Smart Thermostat?

The most impactful features are geofencing, occupancy detection, and energy usage reports. Geofencing uses your phone’s GPS to detect when you leave home, automatically shifting the thermostat to an energy-saving mode before you even reach the end of your street.

Occupancy detection, using either built-in motion sensors or add-on room sensors, ensures conditioned air only goes where people actually are. Energy usage reports, offered by both Nest and Ecobee, give you a weekly or monthly breakdown of runtime hours so you can identify wasteful patterns.

One caveat: if you already set your thermostat back manually every night and when you leave the house, the incremental savings from a smart thermostat’s automatic scheduling may be modest. The biggest payoff comes when the thermostat replaces a fixed setpoint that runs all day.

Compatibility: The Feature People Overlook

Not every smart thermostat works with every HVAC system. Heat pumps, multi-stage systems, and older homes without a C-wire require careful compatibility checking. The Ecobee compatibility checker is one of the most thorough tools available before purchase. Honeywell Home’s T9 also ships with a Power Adapter Kit that solves the C-wire problem for most homes.

How Do Smart Thermostats Integrate With Smart Home Systems?

The best smart thermostats act as a control hub for your broader home automation setup. Google Nest integrates natively with Google Home and works seamlessly with Matter-compatible devices, the new universal smart home standard that launched in 2022 and is now supported by over 4,000 certified products.

Ecobee and Honeywell Home T9 both support Apple HomeKit, which is critical for iPhone-heavy households. If you are already building out a connected home, pairing your thermostat with smart lighting and sensors creates routines that reduce energy use across the whole house. Our guide on how to connect smart home devices without a hub covers the fastest way to get these systems talking to each other.

Utility Rebate Programs

Many U.S. utility companies offer rebates of $25–$100 for installing a qualifying smart thermostat. The ENERGY STAR Rebate Finder lets you search by ZIP code to find programs in your area. Ecobee and Nest are both ENERGY STAR certified, making them eligible for the widest range of utility incentives.

Which Smart Thermostat Is Best for Budget Buyers?

The Amazon Smart Thermostat is the strongest budget pick at $79 MSRP. It uses Alexa’s Hunches feature to automatically adjust temperature based on your usage patterns, and it qualifies for ENERGY STAR rebates that can drop the out-of-pocket cost below $50 in many states.

The Emerson Sensi Touch 2 at $129 is the best mid-range option. It supports all three major voice platforms, Alexa, Google Assistant, and Apple HomeKit, and offers a flexible scheduling interface that rivals pricier competitors. It lacks room sensors, but for smaller homes or apartments, the built-in sensor performs reliably. If you want to manage your energy use the same way you manage other phone-based tools, pairing a budget thermostat with a strong budgeting app gives you a complete picture of where your money goes each month.

Just as maximizing your phone’s efficiency requires knowing the right settings, like the tips in our guide on making your iPhone battery last all day, getting the most from a budget thermostat means configuring its schedule carefully on day one.

How Do You Install a Smart Thermostat?

Most smart thermostats install in 30–60 minutes with a standard screwdriver and no electrical experience required. The process involves turning off your HVAC system at the breaker, labeling and disconnecting existing thermostat wires, mounting the new base plate, and connecting the labeled wires to the corresponding terminals.

The most common installation obstacle is a missing C-wire (common wire), which powers the thermostat continuously. Older homes often lack one. Ecobee includes a Power Extender Kit in the box. Google Nest uses its own battery management to reduce C-wire dependency, though a C-wire always provides the most stable operation. For broader smart home setup context, our walkthrough on setting up smart lighting without an electrician covers the same safety principles that apply to thermostat installation.

When to Call a Professional

Call an HVAC technician if your system uses high-voltage wiring (typically 110V or 240V), has a heat pump with auxiliary heat, or if your current thermostat has more than eight wires. According to the Federal Trade Commission’s home improvement guidance, getting one professional quote before a DIY attempt on complex systems is always worth the hour saved on troubleshooting.

Frequently Asked Questions

What is the best smart thermostat to lower my energy bill?

The Ecobee Smart Thermostat Premium is the top pick for energy savings, delivering an average reduction of 8% in heating and cooling costs, meeting ENERGY STAR’s minimum runtime reduction standard. It also supports multi-room occupancy sensing, which helps prevent energy waste in unused spaces.

Do smart thermostats really save money?

Yes. ENERGY STAR-certified models deliver an average annual savings of $50 on heating and cooling bills, with a minimum guaranteed reduction of ≥ 8% for heating and ≥ 10% for cooling. Real-world savings are influenced by climate, home size, and usage habits.

Which smart thermostat works best with Apple HomeKit?

Ecobee Smart Thermostat Premium offers the most complete Apple HomeKit integration, including Siri voice control and full Home app support. The Emerson Sensi Touch 2 also supports HomeKit at a lower price point, making it the best budget-friendly option for Apple users.

Can I install a smart thermostat myself?

Yes, for most standard HVAC systems. Installation typically takes 30–60 minutes and requires only a screwdriver. Homes with heat pumps, high-voltage wiring, or no C-wire should verify compatibility using the manufacturer’s online tool before purchasing.

What smart thermostat qualifies for a utility rebate?

ENERGY STAR-certified models, including Google Nest, Ecobee, Honeywell Home T9, Amazon Smart Thermostat, and Emerson Sensi, qualify for most utility rebates. Use the ENERGY STAR Rebate Finder to search programs by ZIP code. Rebates typically range from $25 to $100.

Is the Amazon Smart Thermostat worth buying?

Yes, at $79 MSRP, the Amazon Smart Thermostat is the best entry-level option for Alexa households. It is ENERGY STAR certified and supports demand-response programs. While it lacks room sensors and advanced learning features, it still delivers measurable savings and qualifies for rebates that can reduce the cost below $50.

How much can a smart thermostat save on gas bills?

Households with gas furnaces saw an average gas savings of 5% in a study by the Northwest Energy Efficiency Alliance (NEEA), demonstrating that smart thermostats can significantly reduce fossil fuel use, even in homes relying on gas heating.

Do smart thermostats really reduce HVAC runtime?

Yes. ENERGY STAR requires that certified smart thermostats achieve a minimum annual runtime reduction of ≥ 8% for heating and ≥ 10% for cooling. These thresholds are verified through independent testing and are based on real-world performance data.

What happens to a joint bank account when one owner dies?

When one owner of a joint bank or credit union account dies, the funds pass automatically to the surviving owner due to “rights of survivorship,” a rule established by the Consumer Financial Protection Bureau (CFPB). This applies to most joint accounts and is recognized by the FDIC.

How long is an account insured after the owner dies?

According to the Federal Deposit Insurance Corporation (FDIC), the FDIC will insure the deceased owner’s accounts as if they were still alive for six months after their death, preserving coverage during the estate settlement period.