Quick Answer
Yes — but only if you actually program it. Department of Energy guidance says a setback of 7–10°F for 8 hours a day (asleep or away) can save up to 10% per year on heating and cooling. The catch: the savings come from the schedule you set, not the hardware. Energy Star stopped certifying programmable thermostats in 2009 largely because so many owners never changed the factory defaults — and those households often saw little to no savings.
Got the short answer? Good — the part most people miss is the follow-through. Three things determine whether the box on your wall actually lowers your bill:
- The setback itself is proven physics — a house loses heat more slowly when it's cooler inside.
- Heat pumps are the big exception — deep setbacks can backfire without smart recovery.
- Placement and a kept schedule matter more than smart features.
Start with the mechanism below, or jump to the recommended winter schedule. For the bigger picture of home energy costs, see our Heating & Cooling guide.
How Setback Actually Saves Energy
Setting the thermostat back 7 to 10 degrees Fahrenheit for about eight hours a day, typically during sleep or work hours, is one of the simplest ways to cut heating and cooling costs. The Department of Energy estimates this habit can save up to 10 percent a year on those bills for a typical home. The physics behind the savings is straightforward: a house loses heat more slowly when the indoor temperature sits closer to the outdoor temperature, so the furnace or boiler runs less during the setback window. That reduced heat loss is where the savings come from, not from any clever thermostat behavior. A common objection is that the extra fuel burned reheating the house in the morning cancels out what was saved overnight. According to DOE guidance, that is not how it plays out in a typical home; the energy saved during the setback period exceeds the energy needed to recover comfort later. Setback is real, measurable savings, provided the schedule is actually followed. Of course, what controls that schedule, and how well it holds up day to day, is a separate question worth examining.
Programmable vs Smart Thermostat Schedules
A programmable thermostat is only as good as the schedule you actually set. The three common schedule formats are 7-day, where every day can be different; 5-2, with one weekday plan and one weekend plan; and 5-1-1, which adds separate Saturday and Sunday schedules. The format matters less than the discipline of using it. Energy Star stopped certifying programmable thermostats in 2009, largely because field studies found that most owners never moved past the factory defaults, and households running default schedules showed little to no savings over simply adjusting a manual thermostat when needed. Smart thermostats try to close that behavior gap with occupancy sensing, learning algorithms, geofencing, and phone control, and Energy Star estimates certified models save about 8 percent on heating and cooling, roughly $50 a year for a typical home. The underlying physics still applies either way: a house loses heat more slowly when its indoor temperature is closer to the outdoor temperature, so any schedule that reliably delivers a real setback will pay off. That caveat matters most for heat pumps, where a deep setback can quietly erase the gain.
Heat Pump Caveat
Heat pumps and setbacks do not always mix well. When a heat pump recovers from a deep setback, the system can call for backup electric resistance heat, which is far more expensive to run. The result is that some of the savings built up during the setback hours get spent during recovery, and in a cold stretch the bill can climb higher than expected. To preserve the savings, look for a thermostat with adaptive or smart recovery. That feature stages the comeback gradually, easing the system back to setpoint instead of blasting heat at once. Homeowners shopping for a new thermostat should confirm this capability before assuming any standard setback schedule will pay off. The deeper the setback and the colder the outdoor temperature, the more this matters, because that is when resistance backup is most likely to kick in. With the right controls in place, a heat pump household can still capture most of the setback benefit — see our comparison of heat pump vs gas furnace costs for the bigger fuel-choice picture — which sets up the recommended winter schedule that follows.
Recommended Winter Schedule
The Energy.gov winter baseline is straightforward: 68°F while awake and at home, with a 7-10 degree setback during sleep and away periods. The mechanism is straightforward, since a house loses heat more slowly when the indoor temperature is closer to the outdoor temperature, so the heating system runs less during setback hours. Department of Energy guidance indicates this can save up to 10% per year on heating and cooling, and it explicitly rebuts the common myth that recovery heating wipes out those gains. For a typical home, energy saved during setback exceeds the energy used to bring the house back up. Summer mirrors the same logic, with the setpoint raised. Households worried about a chilly morning can use milder setbacks of 2-3 degrees as a compromise, though the savings shrink accordingly. If your utility bills by the hour, pair the schedule with our guide to time-of-use electricity rates; if you want to understand what the runtime costs, start with what a kilowatt-hour actually is. One caveat applies to heat pumps: recovering from a deep setback can trigger backup electric resistance heat, which is expensive, and can erase savings unless the thermostat supports adaptive or smart recovery that stages the comeback slowly. Even a well-designed schedule falls apart, though, if the thermostat itself reads the wrong temperature, which is why placement and setup matter as much as the numbers on the schedule.
Placement and Setup Pitfalls
A poorly placed thermostat quietly sabotages the whole setback plan. Mounting it on an exterior wall, in direct sunlight, near a kitchen, or close to a supply register throws off the temperature reading the system relies on. The thermostat then thinks the house is warmer or cooler than it actually is and cycles the heating equipment at the wrong times, which leads to short cycling and uneven comfort from room to room. By the time a homeowner notices the comfort problems, the problem is usually blamed on the schedule itself, not on the box reading the room. A better location, away from exterior walls, direct sunlight, kitchens, and supply registers, keeps the reading honest and lets the setback strategy actually deliver what the schedule promises. Before pricing out features, it pays to confirm the thermostat sits in a representative spot in the home. That choice sets up the cost and payback math that follows.
Cost and Payback
The hardware is the cheaper half of the equation. Basic programmable thermostats commonly retail for $25 to $60, while smart thermostats typically run $100 to $250. The real question is whether the device will actually deliver enough savings to justify even that modest cost.
The savings mechanism is straightforward. The U.S. Department of Energy notes that setting the thermostat back 7 to 10 degrees for 8 hours a day can save up to 10 percent on heating and cooling annually, because a house loses heat more slowly when the indoor temperature sits closer to the outdoor temperature. Energy Star estimates certified smart thermostats deliver roughly 8 percent savings, around $50 per year for a typical home.
That figure assumes a real schedule is set and actually kept. Energy Star stopped certifying basic programmable thermostats in 2009 largely because so many owners left factory defaults in place, and field evaluations have found those households often show little to no savings over a manual thermostat. Payback, in other words, depends less on the price tag and more on the follow-through. If you’re weighing the upgrade against other efficiency moves, our guide to lowering utility bills ranks the rest of them.
Related Reading
- Why Is My Electricity Bill So High in Summer?
- Heat Pump Running All Day in Winter: Normal or Not?
- Heat Pump vs Gas Furnace: Savings Compared
- What Time Is Electricity Cheapest?
