A temperature of 68°F (20°C) is not warm. It sits right at the boundary between cool and comfortable for most people, and whether it feels pleasant or chilly depends on what you’re wearing, how humid the air is, and whether you’re indoors or outside. For context, 68°F is the temperature many energy agencies recommend as a winter thermostat setting, specifically because it’s the low end of indoor comfort rather than a warm environment.
How 68°F Feels Indoors
Indoor comfort standards define a range where most people feel neither too warm nor too cold. At 68°F with average humidity and light clothing (a long-sleeve shirt and pants), most sedentary adults will feel neutral to slightly cool. Cornell University’s ergonomics research found that a person sitting still in typical indoor clothing stays comfortable at about 69.8°F with 50% relative humidity and minimal air movement. That means 68°F falls just below that threshold, so you may notice a slight chill if you’re sitting at a desk or watching TV.
Adding a light layer, like a sweater or hoodie, eliminates that gap easily. But in shorts and a t-shirt, 68°F indoors will feel noticeably cool for most people, especially after 20 or 30 minutes of sitting still.
How 68°F Feels Outdoors
Outdoors, 68°F generally feels pleasant in calm, sunny conditions. Direct sunlight can add 10 to 15 degrees of perceived warmth on your skin, which is why 68°F on a sunny spring afternoon feels entirely different from 68°F on an overcast, breezy evening. Wind strips heat from your skin faster than still air, so even a light breeze at 68°F can make it feel several degrees cooler.
Humidity also plays a role, though its effect is more pronounced at higher temperatures. The National Weather Service’s heat index chart doesn’t even begin until 70°F because at 68°F, humidity doesn’t meaningfully push the “feels like” temperature higher. In dry climates, 68°F can actually feel cooler than expected because sweat evaporates quickly.
Why 68°F Is the Recommended Thermostat Setting
The U.S. Department of Energy suggests keeping your thermostat at 68°F during winter when you’re home and awake. This isn’t because 68°F is ideally warm. It’s a compromise between comfort and energy cost. Turning your thermostat down 7 to 10 degrees from a higher setting for eight hours a day can save up to 10% on annual heating and cooling bills. Setting it to 68°F rather than 72°F or 74°F keeps you in a livable range while cutting energy use significantly over a heating season.
If 68°F feels too cool at your desk, a space heater or an extra layer is more efficient than raising the whole house to 72°F.
68°F and Sleep
For sleeping, 68°F is actually a bit too warm. Sleep researchers at UCLA recommend setting your bedroom between 60 and 65°F for the best sleep quality. A cooler room helps your body drop its core temperature, which is necessary for falling asleep and reaching the deeper, more restorative stages of sleep. Sleeping in a room that’s too warm tends to keep you in lighter sleep stages, reducing overall sleep quality even if you don’t fully wake up.
So while 68°F might feel slightly cool during the day, it’s on the warm side for a bedroom at night.
Your Body Burns More Calories at 68°F
Cooler environments do make your body work slightly harder to maintain its core temperature. A crossover study published in the Journal of Nutrition measured resting energy expenditure at several temperatures and found that people burned about 73 extra calories per day at 72°F (22°C) compared to a fully warm, thermoneutral environment of 82°F (28°C). At 64°F (18°C), the difference grew to roughly 96 extra calories per day.
These numbers are real but modest. Burning an extra 73 calories at 68 to 72°F is roughly equivalent to walking for 15 minutes. It’s not a weight loss strategy, but it does confirm that 68°F keeps your metabolism slightly more active than a warmer room would.
Who Feels 68°F Differently
Individual variation matters more than most people realize. Body size, muscle mass, age, and metabolic rate all shift your personal comfort zone. Older adults and people with less muscle mass tend to feel cold sooner because they generate less body heat at rest. Women, on average, prefer ambient temperatures about 3 to 5 degrees warmer than men, partly due to differences in metabolic rate and body composition.
Activity level makes a big difference too. If you’re cooking, cleaning, or exercising, 68°F feels comfortable or even warm because physical movement generates substantial body heat. Sitting still on a couch, that same 68°F can feel chilly within minutes. This is why the same temperature can feel fine in a kitchen and cold in a living room on the same day.