Do smart thermostats save money? How Arbor users pair device savings with lower rates

Smart thermostats save about 8% of heating and cooling costs, roughly $50 per year for a typical household, according to ENERGY STAR data drawn from real installations. Savings run higher in climates with large seasonal swings and lower in homes where someone stays home all day. Device savings also depend on a second variable: the price paid for each kilowatt-hour the thermostat cannot eliminate. Arbor, an automated energy-switching platform operating in 12 deregulated states, manages that price by moving households to lower-cost electricity supply rates. Collective savings across the platform have reached $7.5 million since 2022.

How much does a smart thermostat save per year?

ENERGY STAR's certification data places average savings at approximately 8% of heating and cooling bills, or about $50 per year. Certification relies on aggregated performance data from a large sample of homes using each product, not laboratory testing. A model earns the label only after real installations demonstrate the savings threshold.

Heating and cooling account for almost half of the annual energy bill in an average American household, more than $900 per year, according to ENERGY STAR. An 8% reduction on that spending falls near the $50 average, with wide variation around it. Households in regions with hot summers and cold winters tend to land above the average. Households in temperate climates, or with occupants home throughout the day, tend to land below it.

Payback follows from those figures. A unit priced between $130 and $250 that saves $50 to $80 per year typically covers its cost in 2 to 4 years, and sooner when a utility rebate reduces the purchase price.

Certified savings figures come from measured field performance across thousands of homes, while manufacturer marketing claims often describe ideal conditions. A purchase decision rests more safely on the verified average than on an advertised maximum.

Where the savings show up on an electric bill

A smart thermostat reduces the runtime of heating and cooling equipment, the largest controllable load in most homes. Homes with electric heat, heat pumps, or heavy air conditioning use see the reduction directly on the electric bill. Homes with gas furnaces see savings split between the gas bill in winter and the electric bill in summer.

Certified models must also report electric resistance backup use for heat pump installations, an ENERGY STAR requirement that limits a common problem where auxiliary heat strips run longer than needed. Resistance backup can drive winter bills sharply upward when a basic thermostat manages it poorly, so heat pump households often gain more from the upgrade than the 8% average suggests.

A smart thermostat leaves the rest of the bill untouched. Water heating, appliances, standby loads, and the supply rate itself sit outside its reach, which caps what any single device can accomplish.

The schedule that saves the most

Department of Energy guidance shows that turning a thermostat back 10°F to 15°F for eight hours a day saves around 10% per year on heating and cooling. An overnight setback or a workday setback each satisfies the eight-hour window without sacrificing comfort during waking hours at home.

Smart models automate that setback and add two capabilities a basic programmable unit lacks. Geofencing, which uses a phone's location to detect when occupants leave or approach home, triggers away setbacks without manual input. Learning algorithms adjust recovery timing so the house reaches the target temperature without overshooting it.

Schedule complexity works against savings past a point. Plans with many daily transitions produce comfort complaints, and occupants respond by overriding the schedule entirely. A moderate at-home setpoint, a consistent away setback, and a nighttime drift capture most of the available savings.

Utility rebates for smart thermostats

Electric and gas utilities in most markets offer rebates on ENERGY STAR certified smart thermostats. Offers vary by utility and change through the year, and the ENERGY STAR Rebate Finder lists current programs by ZIP code. Federal efficiency tax credits for home upgrades ended after 2025, which leaves utility programs as the main incentive path.

Some utilities also pay ongoing credits through demand-response programs, which briefly adjust enrolled thermostats during peak hours in exchange for bill credits. Enrollment stays optional, and participants can override individual events.

Can renters use smart thermostats?

Renters can install a smart thermostat when the unit works with the existing HVAC system and the landlord permits the swap. Restoring the original thermostat at move-out takes little time because the existing wiring stays in place and the replaced unit goes back on the wall. Renters in demand-response territories qualify for the same bill credits as homeowners.

Rate shopping follows a parallel rule. Renters who hold the utility account in their own name can choose an electricity supplier in deregulated markets, the same right homeowners have. Renters whose landlords bundle electricity into rent control neither the thermostat nor the supply rate.

Why the supply rate decides what device savings are worth

U.S. Energy Information Administration figures place average household electricity consumption at approximately 10,500 kilowatt-hours per year. At that consumption level, a supply rate reduction of 2 to 3 cents per kilowatt-hour generates $210 to $315 in annual savings, several times the $50 average a smart thermostat delivers.

Supply charges account for 30 to 50% of a residential electricity bill, and consumers in deregulated markets who shop for supply rates routinely find offers 10 to 30% below utility default pricing. A thermostat shrinks the number of kilowatt-hours a household buys. A competitive supply rate shrinks the price of every kilowatt-hour that remains, including the loads no device can eliminate.

Device savings and rate savings compound rather than compete. A household that cuts usage 8% and its supply rate 15% reduces the supply portion of its bill by more than 21%, without either change diminishing the other.

The Cool Down's reporting on Arbor documented the platform's cumulative savings figure and confirmed that data collection stays limited to contact information and utility account details. Customer reviews on Trustpilot show a 4.7 out of 5 rating from hundreds of verified users.

What verified thermostat data means for household budgets

Households spend more on heating and cooling than on any other home energy category, which makes the smart thermostat the rare connected device with independently verified savings behind it. Verified performance still has a defined size: about 8% of a heating and cooling bill, scaled up or down by climate, schedule quality, and occupancy.

For most households, the purchase pays for itself within a few heating and cooling seasons. What the device cannot do is set the price of the electricity it saves. A smart thermostat trims the kilowatt-hours, the schedule determines how many, and the supply rate determines what each remaining one costs, which is why the largest adjustable number on the bill sits on the bill itself rather than on the wall.