How cool should my house be if it's 100° outside? The majority of air conditioning units are designed to only cool the air about 20 degrees from the outside temperature. If the temperatures outside are approaching triple digits, you should set your thermostat at about 78°.
They recommend that when it's 90 degrees outside, you should try setting your air conditioning thermostat at 80 degrees or higher. And when it's 95 to 100 degrees outside (and higher), you should set your thermostat at 85 degrees or higher.
Generally speaking an air conditioning system is designed to accommodate up to a 20 degree difference between the outside air and inside air while still keeping around a 55% humidity level which is comfortable.
In fact, heat pumps are more likely to have trouble keeping up in bitterly cold climates, since they rely on pulling heat from the ground or water. HVAC experts maintain heat pumps cool a home just as effectively as a standard air conditioner, no matter what the heat index.
The majority of air conditioning units are designed to only cool the air about 20 degrees from the outside temperature. If the temperatures outside are approaching triple digits, you should set your thermostat at about 78°.
HVAC systems are designed for an average temperature in your area. Your system is also designed to cool to a maximum of 20º below the temperature outside. So when we are having average temperatures, you should have no problem cooling to 70º or 71º if you like.
This is more of a personal question, as different people feel comfortable at different temperatures. 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.
A residential AC can lower the indoor temperature a max of 20°F. The heat transfer capacity of an air conditioner can remove enough heat from a house to drop the temperature by 20°F. It can be set to do less, but it can't be made to do more.
It's best to not set your thermostat lower than 70 to 72 degrees. Most units are not designed to cool a house below that point, and you risk the system freezing up. I recommend trying to keep your house below 80 degrees at all times during the summer.
Best House Temperature While Away: 55–80 degrees
In general, it's safe to increase indoor temperature up to 80 degrees in summer and decrease indoor air temperature to 55 degrees in winter, but there are exceptions - for example, if you live with a baby or an elderly or immune-compromised individual.
Any time you're awake and at home during the summer, the ideal thermostat temperature is 78 degrees. This home temperature for energy efficiency lowers your cooling bills by 12 percent compared to keeping it at 74 degrees. If you're afraid 78 degrees is too warm, remember to dress for the season.
Your AC Is the Wrong Size
It makes sense that if your air conditioner's cooling capacity isn't enough for the space it needs to cool, you'd experience discomfort. So if you're cranking up the AC and still feeling warm and sticky, the AC might be too small to properly cool the size of your home.
Day Time Temperature Setting
To achieve optimal comfort, it is recommended for homeowners to set their thermostats between 68 to 72 degrees while there are people inside of the home.
Yes, water on the roof will help cool it. Cooling with liquid water running off from a sprinkler is not efficient, but evaporative cooling from a small amount of water (like a periodic sprinkle) is very efficient. 1 gallon of water consumes 8000 BTU as it evaporates.
Get strategic with your windows
Close windows, blinds, shades and curtains to keep heat outside. Light-colored window coverings also help reflect heat away. Close windows and window coverings in hot weather during the day to keep hot air out. Open windows at night or early morning to let cool air in.
The best AC temperature for sleeping is generally between 60-67 degrees, according to sleep psychologist Michelle Drerup. As your body falls asleep, its temperature decreases slightly. So, setting your thermostat between 60-67 degrees helps this process, therefore helping you fall asleep faster and more comfortably.
To stay comfortable and save money this summer, the U.S. Department of Energy recommends setting your thermostat to 78F (26C) when you are home. Setting your air conditioner to this level will allow you to stay cool and avoid an unusually high electricity bill.
The Ministry of Power (Bureau of Energy Efficiency) has said that all room air conditioners (AC) will have to ensure a default temperature setting of temperature in the appliances at 24 degree celsius from January 1, 2020.
Turning your AC to 69 degrees is getting relatively close to the “danger zone” for causing it to freeze up and break. Typically, we recommend keeping your thermostat set to no less than 68 degrees. Since 69 is above that temperature, it would most likely be safe.
What's The Best Temperature To Set Your Thermostat: Summer
Typically, our bodies are most comfortable when the air inside our home is 74-76 degrees. So, a safe setting is 75 degrees. However, this is only necessary when you're in your home. If you're like most, you are gone during the day.
Your AC will actually run longer overall if it is left on all day instead of being shut off. If you turn it off for part of the day, it runs less and results in more energy savings for you. In almost all cases, it will save you money to shut off your AC while you are away from home.
How Long Should You Run Your AC Each Day? During a warm or humid day, an average air conditioning unit should run for about 15 or 20 minutes. After 20 minutes, the indoor temperature should reach your desired setting and the unit will turn itself off.
If your ac is still not cooling there is one more thing you need to do. This is very important.... TURN IT OFF and call your HVAC service provider to assist you. We always tell our customers to turn off an ac that is not cooling properly.