What temperature should I set my thermostat overnight?

Author: Dr. Enrique Fadel  |  Last update: Tuesday, July 1, 2025

To support the best sleep possible, you should aim to set your thermostat around 65 degrees.

What is a good overnight house temperature?

The best room temperature for sleep is approximately 65 degrees Fahrenheit (18.3 degrees Celsius). This may vary by a few degrees from person to person, but most doctors recommend keeping the thermostat set between 60 to 68 degrees Fahrenheit (15.6 to 20 degrees Celsius) for the most comfortable sleep.

Is 72 a good temperature for air conditioning at night?

The ideal temperature for your air conditioning at night can vary based on personal comfort, but many experts recommend setting it between 68°F to 72°F (20°C to 22°C) for optimal sleep. This range helps promote better sleep quality while also being energy efficient.

What is the best temperature to set the thermostat at night?

The sleeping temperature recommended by every study is different, but most studies recommend setting your thermostat to about 65ºF (18.5ºC) overnight.

What temperature should I leave my heating on overnight?

Your thermostat should be set to around 18-21°C, which is the lowest comfortable temperature that is economical too. Not only will this lower your heating bills, it will help to lower your carbon footprint and reduce your households' environmental impact.

How low should you set your thermostat at night?

How cold should I let my house get at night?

The best winter thermostat setting is 62 to 68 degrees. On winter days, program your home's thermostat to 68 degrees for a comfortable indoor temperature while you're home and awake. When sleeping, program your thermostat to 62 degrees. Consider rolling this temperature back to 55 degrees when no one is home.

What is the most cost-effective way to use central heating?

Set your room thermostat

A room thermostat stops your central heating system using more energy than it needs to. It turns the heating on until the room reaches the temperature you've set. Once it reaches the set temperature, it turns the heating off until the temperature drops again.

Is 78 too hot for a house?

According to Energy Star, it's an ideal temperature. 78 degrees keeps you fairly cool and comfortable during the day. It also shouldn't make your electric bill skyrocket. Start with your thermostat at 78.

What is the best temperature to set AC at night?

The National Sleep Foundation recommends an optimal range to promote sleep, which is between 60 degrees and 67 degrees.

Is 75 degrees too hot to sleep?

Research shows sleep can be disrupted by temperatures anywhere below 65 degrees Fahrenheit or above 75 degrees Fahrenheit. But for most people, heat interferes with sleep more than cold does. Sleep experts believe the best temperature for great sleep is between 68-72 degrees Fahrenheit.

Why should people stop setting their thermostats to 72?

Setting your thermostat just a single digit higher can help you save 6 percent on your cooling costs, according to the EPA.

What is the perfect temperature to sleep?

The best room temperature for sleep is approximately 65 degrees Fahrenheit (18.3 degrees Celsius). This may vary by a few degrees from person to person, but most doctors recommend keeping the thermostat set between 65 to 68 degrees Fahrenheit (15.6 to 20 degrees Celsius) for the most comfortable sleep.

Is it OK to run AC all night?

Running the “auto” function of your air conditioner all day and night isn't the best idea for any home. There are a few reasons you don't want to run your AC system all the time: System stress: Your air conditioner unit needs time to take a break.

What temperature should I be overnight?

An ideal bedroom temperature is around 16-18°C (60-65°F). If you've ever been too hot or too cold when trying to sleep, you'll understand how difficult it is to catch some Zzzs. Hot, cold and draughty rooms can seriously impact your sleep, in particular REM (rapid eye movement) sleep.

What's the lowest temperature you should keep your house at?

The World Health Organization (WHO) recommends setting your thermostat no lower than 64 degrees (F) in the Winter months while people are in the home. If there are infants or elderly individuals, they recommend keeping the temperature at 70 degrees at a minimum.

Is it cheaper to leave your thermostat at one temperature?

Keeping your home at a constant temperature generally means that your HVAC system will run constantly to meet it. This means that your furnace or air conditioner may run when you're asleep, at work, or out of the house. This wastes more energy than the minimal amount that you might save by having it constantly run.

How cool should my house be if it's 100 outside?

For many of us, 70 degrees is the ideal indoor temperature, but when it is close to 100 degrees outside, your AC unit will be working quite hard to meet these expectations. Consider setting your thermostat at 75 degrees to 80 degrees in your home if the outside temperature is approaching triple digits.

Is 72 too cold for AC?

While the standard room temperature of 72 degrees Fahrenheit is commonly favored by many, others argue for higher settings, particularly when it's hotter outside.

What is the best temperature for a thermostat at night?

Tonight, before you head to bed, check your thermostat. Set it somewhere between 60 and 65 degrees Fahrenheit. People sleep better in that temperature range. “Not only in terms of maintaining sleep, but also of falling asleep,” says Alon Avidan, MD, MPH, director of the UCLA Sleep Disorders Center.

Is it safe to sleep at 78 degrees?

“Anything under 68 degrees overall is ideal for sleep. If you get too hot in the middle of the night, reduce layers of clothing or sheets, turn on fans, or drink a little cold water.”

What is the best AC temperature for sleeping in summer?

78°F is generally considered a comfortable temperature for most people in a house, especially in warmer months. It balances comfort and energy efficiency. However, personal preferences and humidity levels can make it feel warmer or cooler, so adjusting slightly up or down may be necessary for optimal comfort.

Does keeping the AC at 78 save money?

U.S. Department of Energy research suggests that setting your programmable thermostat to 78 during the summer months is the best way to save money on your cooling costs while maintaining a comfortable temperature.

What temperature should a house be at night?

Ideally you should heat your home to a temperature of at least 18 °C. This is particularly important if you have reduced mobility, are 65 or over, or have a health condition, such as heart or lung disease. Having room temperatures slightly over 18 °C could be good for your health.

How to heat your house for free?

How To Heat Your House For Free
  1. With energy bills increasing by the year, more and more people are looking for ways to keep their property warm without turning on the heating. ...
  2. Let Sunlight In. ...
  3. Rearrange Your Furniture. ...
  4. Insulate Your Windows. ...
  5. Make A Terracotta Heater. ...
  6. Bleed The Radiators. ...
  7. Put A Shelf Above The Radiator.

Is it better to turn the heat off or down at night?

It's More Advisable to Turn the Heat Down, Not Off

HVAC replacement companies recommend turning the temperature down by at least eight degrees before you go to sleep for eight hours or more, depending on how long you sleep at night.

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