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What Temperature Should I Set My Air Conditioner In The Summer?

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The words "Air Conditioner Temperature" over an image of a mini split AC unit, representing the ideal summer air conditioner temperature and settings to use to save money, help the environment, and combat global warming.
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The average American family spends about $1,070 on electricity every year, and air conditioners can represent over 25% of your home energy costs, depending on where you live, according to the U.S. Energy Information Administration. As summer temperatures rise, so do summer electricity bills. Thankfully, you can keep your home comfortable without dramatically driving up energy costs by using the right temperature settings for your air conditioner in the summer.

The best way to lower your energy usage is to use your air conditioner less, but that can be difficult if you live in an area with lots of hot weather. With these guidelines for summer thermostat settings and energy efficiency tips, you can keep your home comfy without blasting the AC.

What Is The Best Thermostat Setting For Summer Air Conditioner Use?

The U.S. Department of Energy (DOE) recommends the following thermostat temperatures for your air conditioner in the summer:

  • 78°F during the day if people are home
  • 82°F at night if people are home
  • 85°F if no one is home

Are There Better Summer Thermostat Settings That Aren’t So Sweaty?

If you think those suggested air conditioner settings are high, you're not alone. Many people struggle with following them, especially if they live in a hot and humid place during the summer months. Keeping your home at those temperatures could make you feel like you're trapped in a sauna.

While you could manually adjust your thermostat settings throughout the day and night, we have a better idea: Just find the settings that keep your family comfortable, while not overworking your air conditioner all summer.

To find the right comfort level for your family, we recommend the following method:

  1. Start with your ‘normal’ temperature in summer that you typically set the thermostat to
  2. Increase the daytime thermostat setting by 1 degree each day, as this gives your body time to adjust to the higher temperatures
  3. Once you reach a temperature where it’s consistently too warm and doesn’t feel comfortable, just reduce that temperature setting by 1 degree and leave it there
  4. Repeat the exercise for nighttime to find your perfect sleep temperature

Factors That Can Impact Your Home's Thermostat Setting in Summer

Despite those DOE temperature recommendations, the right settings for your home can depend on several factors:

Your Air Conditioner’s Age

If you have an older heating, ventilation, and air conditioning (HVAC) system, it might not be able to keep up with demand if you run it on full blast for hours at a time. Older units can't distribute air as efficiently as newer ones because they typically don't have as much insulation around them and they were built without energy efficiency in mind.

If you have an older unit, consider investing in semiannual inspections to ensure your HVAC system stays in good working order. Because the harder it works to cool your home, the higher your energy bills will be.

Your Area’s Climate

Humidity refers to the amount of water vapor in the air, and it can have a significant impact on how comfortable your home feels. If there is too much moisture in the air, it can cause discomfort and even promote mold growth in your home. At the same time, without enough humidity, your skin may feel dry and itchy as it loses its protective oils.

The best way to maintain a healthy level of humidity is to ensure that the performance of your AC unit matches your climate. You should consult with a trusted HVAC specialist in your area to ensure that your air conditioner is calibrated properly.

Your Home's Insulation

Installing sufficient insulation is one of the best ways to reduce cooling costs in your home. Insulating your walls, ceilings, and attic helps keep your home cooler in the summer and warmer in the winter, so your AC doesn’t have to work as hard to maintain a temperature.

Since the location of your home can impact the climate you experience, ENERGY STAR has provided recommendations for home insulation R-levels. Talk to your local HVAC technician for additional suggestions, including advice for a company that can install the insulation for you.

Your Home’s Sunlight Levels

The summer temperature you set for your air conditioner can also depend upon the amount of sunlight that enters your home through windows, doors, and skylights. As the sun beats down on the windows and walls of your home, it raises the indoor temperatures.

If there are no trees or other structures between your home and the sun, you may want to find ways to block some of that sunlight during the day, including:

  • Adding interior curtains to large windows
  • Installing exterior shutters
  • Tinting windows and glass doors

Tips for Helping Your Air Conditioner and Thermostat Settings

The best way to keep your summer energy bills low is to find ways to reduce your total energy consumption. Since it can be hard to use less electricity while also keeping your air conditioner at a comfortable level for your family, we’ve assembled some tips to help your air conditioner perform better:

Check for Air Leaks

Leaks in your ductwork can cause your HVAC system to work harder than necessary, which quickly leads to wasted energy and large electricity bills. While you could use a DIY duct detector to check for leaks, the easiest way is to hire a licensed HVAC professional to inspect your system for leaks and make any necessary repairs. The cost of that work is often offset by the energy savings you’ll see from increased AC efficiency.

Install Ceiling Fans

Ceiling fans can help make your house feel more cool to save money and save energy costs by providing an alternative source of ventilation and air movement during hot months. They keep the cool air circulating in your home and across your skin, which helps you feel cooler without lowering the thermostat.

Studies show that ceiling fans can make your home feel up to 4°F cooler. Just make sure that you set the fan to blow air down into the room in summer, because most fans have a separate summer and winter mode.

Fix Seals Around Doors and Windows

If there are gaps in the seals around your doors or windows, hot air can enter your home instead of staying outside where it belongs. Correcting these issues is rather simple:

  1. Place your hand or face near the outer edge of your windows and any doors leading to the outside.
  2. If you can feel the flow of air in any way, your seals may need maintenance.
  3. Replace the weatherstripping around any doors and windows.
  4. Add fresh silicone caulk around the window frames.

Install an Efficient Programmable Thermostat

Programmable and smart thermostats allow you to set an ideal temperature for different times during the day. This means you don't have to remember to manually adjust the settings to reach your preferred temperature. These devices can save up to 10% on heating and cooling bills—but only if you use them correctly.

Before you start adjusting your settings to set your thermostat, you should check the manufacturer's recommendations for programming instructions. This is especially important if you've recently upgraded to a newer smart thermostat with more bells and whistles.

Conduct HVAC Maintenance

You can also reduce your energy consumption by simply taking good care of your HVAC system. The two biggest steps include:

  1. Change the filter every month (or quarterly, depending upon the manufacturer’s recommendation)
  2. Have it inspected by an HVAC professional regularly, especially the hardware, ducts, and registers

The goal of this maintenance is to ensure that everything works properly, and to make adjustments or repairs as needed. This helps reduce wear on components, and improves efficiency by allowing air to flow better through the system. A dirty filter causes your system to work harder and use more energy than necessary.

Summer Air Conditioner Settings

In the summer, experts believe the thermostat for your air conditioner should be set to at least 78°F during the day when people are at home. That setting is designed to help people avoid high energy bills in the summer. The lower your thermostat setting, the higher your bill.

However, we also believe that the actual AC temperature you use should be a matter of personal comfort. You don't want to be miserable in your own home. When setting your AC thermostat in the summer, several factors will affect how much energy you use, including local climate, how your home is built, and the age of your HVAC system

Thus, there are several tips you can use to help your AC work properly, lower your energy usage, and keep your energy bill from rising:

  1. Make sure you have good ventilation in all rooms, and use fans where possible
  2. Turn off lights when they aren't being used
  3. Replace the filter once a month (or quarterly at minimum)
  4. Find the right setting for your family that everyone enjoys, without running the AC all the time

Once you’ve reduced your AC use as much as possible, the next step to air conditioner savings is to power it with renewable energy from all the summer sunshine that’s warming up your home! The time of day when solar power is most efficient is also usually the warmest, so it’s a great combo.

Palmetto can help you install a solar power system on your roof, so you can turn that summer heat into cool savings. Get started today with our Free Solar Design and Savings Estimate Tool to see how much you could be saving with solar panels.

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