Cheapest Thermostat Setting for Winter: The Real Number

TL;DR: The Department of Energy recommends 68°F while you're home and awake, then dropping 7-10 degrees for at least 8 hours a day, saving up to 10% on annual heating costs. Every degree lower saves roughly 1-3% on your heating bill. Going below 65°F rarely saves more and risks frozen pipes if you're gone a lot.

_Last reviewed: July 2026 · 6 min read_

Your gas bill jumped again and you're wondering if the answer is just turning the dial down further. It's not that simple, and the number that actually saves money surprises most homeowners.

Okoniq Property Hub logs your thermostat schedule and seasonal maintenance dates side by side, so you can see which changes actually moved your utility bill.

What temperature actually saves the most money?

68°F while you're home and awake is the number the Department of Energy has landed on for decades, based on furnace load data across climate zones. That's not the "cheapest" temperature in isolation, it's the balance point where comfort holds and the furnace isn't working overtime.

The real savings come from the setback, not the daytime number. Dropping the thermostat 7 to 10 degrees for at least 8 hours a day, typically overnight or while you're at work, can save up to 10% a year on heating. A three-bedroom house in Minneapolis running the furnace an extra 8 hours a day at 72°F instead of cycling down to 62°F overnight can add $150 to $300 to a winter heating bill, depending on fuel type and insulation.

Gas furnaces and heat pumps respond differently to this math. Heat pumps lose efficiency below 60°F because the compressor has to work harder to recover the lost heat, so large setbacks aren't as free as they are with gas or oil furnaces. If you have a heat pump, keep the swing closer to 4-5 degrees rather than 8-10.

Does every degree lower really save money?

Yes, roughly 1% to 3% per degree, according to most utility company estimates, but the savings aren't linear once you get below 65°F. At that point you're fighting condensation risk on windows, discomfort that makes people run space heaters (which cost more per BTU than central heat), and in unoccupied homes, frozen pipe risk once indoor temps approach 55°F.

If nobody's home for a stretch longer than a day, 60-62°F is the sweet spot: low enough to cut fuel use meaningfully, high enough to protect plumbing. Homes with unheated crawlspaces or older, less-insulated walls should stay closer to 62-65°F even when vacant, because pipe runs near exterior walls freeze faster. If you're not sure your attic is holding heat where it should, signs your attic ventilation is failing your roof is worth a look before you assume the thermostat is the only variable.

Is a programmable or smart thermostat worth it for this?

Yes, a programmable thermostat pays for itself in one heating season for most owner-operators, typically $50 to $250 depending on model, against $100+ in annual savings from consistent scheduling. The gain isn't really about the technology, it's that manual thermostats get forgotten. Nobody reliably walks over and drops the temp every night at 10pm and bumps it back at 6am for months straight.

| Manual Thermostat | Smart/Programmable | |---|---| | Relies on you remembering | Runs the setback automatically | | $0 upfront | $50-$250 upfront | | No usage data | Shows runtime and savings trends | | Works fine if occupancy is steady | Adjusts for vacations, remote work days |

Smart models add one more thing worth the money: they show you actual furnace runtime, which flags a filter that's overdue or a furnace short-cycling before it becomes a $400 repair. That pairs well with basic filter upkeep, covered in 1-inch vs 4-inch furnace filters, since a clogged filter forces the furnace to run longer at any thermostat setting.

Does the thermostat setting matter if the house is leaking heat anyway?

No amount of thermostat discipline fixes a house that's losing heat through gaps, and this is where most of the "cheap" strategy actually lives. A furnace working to hold 68°F in a house with poor attic insulation or masonry gaps runs longer and burns more fuel than the same furnace in a tight house holding 70°F. The thermostat is the last 10% of the savings equation; the building envelope is the other 90%.

Before winter really sets in, checking mortar joints and chimney seals matters more than most people think, since gaps there pull warm air out fast. See 5 masonry jobs you're forgetting before winter for the checklist. Gutters matter too, indirectly, because ice dams from clogged gutters force water and cold air back under the roofline; 5 gutter jobs you're forgetting before winter covers the fix.

FAQ

What temperature should I set my thermostat at night?

60-62°F for most homes, or 7-10 degrees below your daytime setting, whichever is higher if you have a heat pump or older plumbing near exterior walls.

Is 65°F too cold for a house in winter?

No, 65°F is a reasonable daytime setting for anyone comfortable in a sweater, and it saves roughly 3-9% compared to 68-70°F, but check for condensation on windows if you go this low regularly.

What temperature will freeze my pipes?

Pipes are at real risk once indoor air near them drops below 32°F, which usually means the house itself is near 40-45°F for an extended period. Keeping the whole house above 55°F, even when vacant, gives a safety margin.

Does turning the heat off completely save money?

No, in most cases it costs more, because the furnace has to work at full capacity to recover from a cold house rather than maintaining a modest setback, and pipe freeze risk goes up sharply.

How much can a programmable thermostat actually save per year?

The EPA and DOE estimate around $100 a year for an average household using proper setback scheduling, with payback on the device itself typically within one heating season.

This is educational information, not engineering or HVAC advice. Call a licensed HVAC technician if your furnace is short-cycling, your heat pump can't hold temperature, or you're unsure whether your specific system handles deep setbacks well.