The Truth About Setting Your Thermostat to 68°F

TL;DR: The U.S. Department of Energy recommends 68°F while you're home and awake in winter, and lowering it 7-10°F for 8 hours a day (like overnight) can save about 10% a year on heating costs. The savings only hold if your home holds heat well — a drafty house or a clogged furnace filter can erase most of that benefit. For most owner-operators, the smarter move is 68°F as a baseline, adjusted down at night and when the house is empty.

_Last reviewed: July 2026 · 7 min read_

Every winter someone tells you 68°F is the "correct" thermostat setting, and every winter someone else says their house feels like a meat locker at that temperature. Both people are right, because 68°F isn't a magic number — it's a starting point that only works if the rest of your house is doing its job.

Okoniq Property Hub keeps a log of your HVAC service dates and filter changes, so you know whether your system is actually efficient enough to make 68°F comfortable.

Why does everyone say 68 degrees specifically?

The 68°F number comes from the Department of Energy and ENERGY STAR guidelines, which peg it as the sweet spot between comfort and cost during waking hours in winter. It's not based on physiology — it's based on the fact that each degree you lower your thermostat in the 60-70°F range saves roughly 1% to 3% on heating costs, depending on your climate and home's insulation.

The number gets more useful when you attach it to a schedule. DOE guidance suggests 68°F while home and awake, then dropping to 60-65°F while you sleep or are away for 8 hours, which can save about 10% annually on heating and cooling combined. That's the actual math behind the advice — not comfort, cost.

Does 68 degrees actually save real money, or is it a myth?

It saves real money, but the size of the savings depends entirely on how well your house retains heat. If your attic insulation and ventilation are working correctly, dropping from 72°F to 68°F might save you $30-$60 a month on a typical furnace bill in a cold climate. If your attic ventilation is failing your roof, your furnace is fighting a losing battle regardless of the thermostat setting, and you'll barely notice the difference.

The same logic applies below the floor. A home with a compromised crawlspace loses heat through the ground, and no thermostat setting fixes that. If you haven't checked in a while, signs your crawlspace vapor barrier has failed are worth ten minutes with a flashlight before you blame the thermostat for a high bill.

What temperature should you actually set it to?

68°F is the right default for most households, but the right number for your house depends on three things: insulation quality, HVAC efficiency, and who's home. A well-insulated 1,800-square-foot home built after 2000 holds 68°F comfortably with a properly sized furnace. An older home from the 1970s with single-pane windows might need 70-71°F to feel the same, because the walls are radiating cold back at you.

| Scenario | Recommended daytime setting | Why | |---|---|---| | Well-insulated home, occupants home | 68°F | DOE baseline, minimal comfort loss | | Older home, drafty windows | 70-71°F | Radiant cold from walls offsets air temp | | Empty house during the day | 62-66°F | No comfort tradeoff, pure savings | | Overnight, under blankets | 60-65°F | Body heat + bedding compensates |

The setting matters less than the consistency. Constantly bumping the thermostat up and down doesn't save money the way people think — it just makes your furnace cycle harder to catch up, which adds wear.

Does your furnace system even support 68 efficiently?

It might not, and the filter is usually the first place to check. A dirty or wrong-sized filter forces your furnace to work harder to push air through, which raises your bill regardless of what temperature you've set. If you're unsure whether your filter setup is helping or hurting, the difference between 1-inch and 4-inch furnace filters comes down to airflow resistance and how often you have to swap them — a 4-inch filter typically lasts 6-12 months versus 1-3 months for a 1-inch, and puts less strain on the blower motor.

A furnace that's more than 15-20 years old also runs less efficiently than a newer unit, meaning 68°F on an old system can cost what 70°F costs on a new one. If your heating bills feel high no matter what you set the thermostat to, the system itself — not the number on the dial — is likely the real issue.

Is a smart thermostat worth it for hitting 68 consistently?

Yes, for most households, because a programmable or smart thermostat removes the guesswork of remembering to adjust manually. Models like the Ecobee or Nest let you set 68°F for waking hours and automatic setbacks for sleep and away periods, and ENERGY STAR estimates smart thermostats save the average household about $50 a year compared to manual adjustment habits. The upfront cost is typically $130-$250, which pays for itself in two to five years depending on your climate and how disciplined you were with a manual thermostat beforehand.

FAQ

Is 68 degrees too cold for elderly residents?

Not inherently, but older adults regulate body temperature less efficiently and may prefer 70-72°F. The CDC notes that adults over 65 are at higher risk for hypothermia even in indoor settings below 65°F, so 68°F is a reasonable floor, not a ceiling, for that group.

What temperature should I set my thermostat to when I'm not home?

Set it 7-10°F below your normal daytime setting, so roughly 58-61°F if you keep 68°F while home, for savings of about 1% per hour of setback without risking frozen pipes in most climates.

Does lowering the thermostat at night actually save money?

Yes, an 8-hour nightly setback of 7-10°F saves around 10% annually on combined heating and cooling costs according to DOE data, and most people sleep better in a cooler room anyway.

Will 68 degrees prevent my pipes from freezing?

Yes, 68°F is well above the risk threshold. Pipes generally only face freeze risk when interior temperatures drop below 55°F for extended periods, so 68°F leaves a wide safety margin.

Why does my house feel cold at 68 even though the thermostat says 68?

This is usually radiant cold from poorly insulated walls, windows, or floors, not an inaccurate thermostat. Air can read 68°F while you still feel a draft from a cold surface nearby, which insulation upgrades fix better than raising the setting.

This is educational information, not HVAC or energy-efficiency advice. Talk to a licensed HVAC technician about the right settings and system size for your specific home.