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How Long Should an AC Run on a 100 Degree Day?

How long should an ac run on a 100 degree

In Southern California, 100+ degree days are becoming more common. Extreme temperatures can put quite a strain on your AC. In general, air conditioners run in cycles of about 15 to 20 minutes. Longer than that can indicate a problem, but how long should an AC run on a 100-degree day?

Your AC will work harder to cool your home when outdoor temperatures are higher than normal. The compressor will run more frequently to reach and maintain the desired indoor temperature. The air conditioner may run all the time if the temperature hits 100℉ and soars even higher.

Is My AC Working Properly?

Even though your AC will likely run often on a hot day, there are signs to look for that might indicate a problem, such as the AC running continuously, yet your home isn’t staying cool or getting cool at all. This can mean:

  • The thermostat isn’t set right.
  • Airflow is blocked.
  • The evaporator or condenser coil is dirty.
  • There’s a refrigerant leak.
  • The AC is too small for your home.

The thermostat is the first place you should look. If it was accidentally switched to heating mode, then your home won’t get cool. Switching it to the proper mode should resolve the issue. Also, use the “auto” setting so the system will run until it reaches the desired temperature. For the most efficient performance, set the thermostat 20 degrees lower than the temperature outside. On a 100℉ day, set it to 78℉ to 80℉ to manage utility costs.

If there’s a lack of airflow, the filter may need to be changed or AC vents cleaned. But it may also mean your air conditioner needs professional repair. If an evaporator or condenser coil is dirty, this can block the transfer of heat, so the air coming from the vents may be less cool. Low refrigerant levels can cause your AC to run all day. You may also hear a bubbling or hissing noise or see refrigerant leaking, which can be a dangerous situation.

If your AC isn’t working properly, it’s important to call an HVAC contractor quickly to resolve the problem.

Don’t Run Out and Get a Bigger AC

Average daily high temperatures seem to be increasing and there are more hot days per year than ever before. But an AC must still be properly sized. Oversizing a unit will cause your house to cool too quickly. It won’t run long enough to remove humidity, making it clammier and more conducive to condensation and mold. The system will also use more energy leading to higher electricity bills.

Tips for Running Your AC on a 100 Degree Day

In addition to keeping the thermostat at a reasonable setting, here are some ways you can keep your home cool on the hottest days:

  • Close the doors to unused rooms.
  • Cover windows that face direct sunlight.
  • Let the dishwasher air dry with the door open.
  • Air out clothes instead of using the clothes dryer.
  • Take shorter showers and open a window to vent warm air.
  • Use fans to improve air circulation and the cooling effect.
  • Have a barbecue and cook outdoors.
  • Make sure your AC is regularly maintained.

Contact NexGen for AC Repair, Installation, and Maintenance

NexGen is a leading air conditioning services company in Southern California. If you’re wondering how long an AC should run on a 100-degree day, and suspect your system isn’t running properly, our licensed, insured technicians will quickly identify and fix any underlying issue. Google Certified for Home Services, we service all types, makes, and models of ACs. We know air conditioners tend to break down on the hottest days. Contact us today to request immediate residential and commercial AC services.

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