What is the best cooling setting for AC?

Author: Robin Aufderhar  |  Last update: Friday, March 13, 2026

The recommended rule of thumb for summertime is to set the temperature to 78 degrees Fahrenheit when you're home and higher when you're away. In general, set it to 82 degrees Fahrenheit when you're asleep and 85 degrees Fahrenheit when you're away.

Is 72 a good temperature for air conditioning?

Setting your air conditioning to 72°F is generally considered a comfortable indoor temperature for many people. It strikes a good balance between comfort and energy efficiency, making it a popular choice for residential settings.

Which mode of cooling is best in AC?

In general, air conditioners work best in cooling mode when the temperature is set between 22°c to 24°c with a medium or high fan speed setting. You can change it according to your preferences at any given moment, but the efficiency may be impacted negatively.

Is 74 a good temperature for AC?

If it's just you and your spouse, you may be fine with the temperature set at 75-77. But if you have kids and pets running around, or you're cooking and using your oven, these things can all raise the indoor temperature noticeably. So, you might find a temperature setting in the 72-74 range more comfortable.

What should I set my AC to in summer?

What is the Best Thermostat Setting for Summer Air Conditioner Use? Energy Star 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.

Best AC Setting For Cooling: Best Air Conditioner Temperature to Save Money, Set AC to Auto or On?

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.

Should AC be on auto or on?

There are benefits to having your air conditioner set to “auto” and “on.” The benefits of the “auto” setting include higher efficiency, lower energy bills, better humidity control, less wear and tear on some components, and quieter running.

What is the best AC setting for cooling?

In most situations, 78'F is the ideal AC temperature to save electricity. The U.S. Department of Energy advises keeping your home between 72° and 78° Fahrenheit to preserve comfort and a manageable electric expense.

Does keeping the AC at 72 save money?

Best AC Temperature Settings While You Are Home

As you consider the most comfortable room temperature for your lifestyle and family, keep in mind that for each degree that you set your thermostat above 72 degrees, you can save up to 3% on your energy bill.

Is 75 too cold for AC?

Since 72 degrees is generally agreed upon to be an ideal indoor temperature, most people would probably still feel comfortable setting their AC units slightly higher than this, perhaps at around 75.

What is the best fan setting for AC in summer?

Keeping your fan on AUTO is the most energy-efficient option. The fan only runs when the system is on and not continuously. There is better dehumidification in your home during the summer months. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside.

What temperature does AC best cool?

The ideal temperature for your AC depends on several factors. In general, it's recommended to keep your thermostat between 24°C (75°F) and 26°C (78°F) for a good balance between comfort and energy efficiency. Setting your AC lower won't cool the room much more but will make it run harder and cost you more money.

What is the most efficient setting for air conditioner?

Set your air conditioning to the highest level that's comfortable. Turning our attention to the air conditioning unit itself, the most energy efficient action is to set the temperature to the highest value that's still comfortable (26°C during the day and 22°C when sleeping is often recommended).

Which mode is best for AC in summer?

Cool mode: Ideal for hot days, this mode reduces the room temperature to your desired setting. Dry mode: Perfect for humid conditions, this mode removes excess moisture from the air without significantly reducing the temperature.

Why is my AC set to 74 but reads 78?

If the temperature is set to 74°F but the thermometer shows 78°F, you will have to recalibrate the thermostat to account for this 4-degree deviation. Even with older AC units or furnaces, you might have to recalibrate your thermostat from time to time.

Is 72 too cold for summer?

To maintain a comfortable indoor environment during the summer, the American Society of Heating, Refrigerating & Air Conditioning Engineers recommends a range of 73 to 79 degrees Fahrenheit. On scorching hot days, you may want to adjust your thermostat toward the higher end of that range.

What should I set my AC to at night?

Recommended AC Temperature for Sleeping

The Sleep Foundation says 65° is the best temperature for sleeping. However, if you prefer a slightly warmer or cooler room, that's okay, too. The recommended range is 60–68°, so there is some wiggle room.

Is 72 for AC too cold?

When setting your thermostat, most homeowners find 72 is a good temperature for air conditioning. However, you may need to adjust that setting based on weather conditions. The bigger the difference between indoor and outdoor temperatures, the higher your energy bill will be.

What is the cheapest temperature setting for AC?

Choosing the Best Temperature for Your Air Conditioner

You can also reduce your energy costs significantly by raising the temperature while you are at work, away from home, or asleep. For the greatest savings, consider setting your thermostat to: About 78 degrees while you are at home.

What is the lowest you should set your AC to?

In short, the 20-degree rule of air conditioning states that you should always keep your AC unit at no more than 20 degrees lower than the outside temperature. It means that, if the outdoor conditions are at 95 degrees, you should set your thermostat at no less than 75 degrees.

What is the highest cooling mode in AC?

The turbo mode is the most powerful. It's for absolute quick cooling. It allows users to cool a room quickly and effectively by operating at a span of 30 minutes before switching back to the previous settings.

What is the best temperature for 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.

What is the best setting for AC?

The Best Temperature for Reducing Energy Usage

The U.S. Department of Energy recommends setting your thermostat to 78°F for a balance of comfort and savings. Smart thermostats can further optimize cooling, letting you increase temperatures while away and automatically cool the house when you return.

Is it OK to run AC in auto mode?

Yes, Auto mode is intended to save energy. The air conditioner can conserve energy and save you money on your energy bills by automatically adjusting the temperature and fan speed based on the ambient conditions and the presence of people in the room.

Why is AC not blowing cold air?

First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.

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