Asked by: Belkis Melle
home and garden indoor environmental quality

How long can you run an air conditioner continuously?

Last Updated: 17th January, 2020

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So, your air conditioner should run for about fifteen minutes at a time on mild days and almost constantly on the hottest days, all while keeping your home nice and cool.

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Keeping this in view, how long can ac run continuously?

On a normal summer day, you can expect your air conditioner to run somewhere around 15 minutes during every cooling cycle. But if your cooling cycles are lasting 30 minutes, an hour or all day long, there's a good chance that something is amiss with your system.

Also Know, can you run your air conditioner 24 7? The simple answer is no, you should not run your air conditioner 24/7. According to multiple sources, running your unit constantly puts strain on the air conditioner and wastes large amounts of energy. It is also wise to turn down your air conditioner if you're leaving for extended periods of time.

Similarly one may ask, is it OK for my air conditioner to run continuously?

Here's the thing: It's normal for your AC to run continuously during hot summer months. You see, on extremely hot days—we're talkin' high 90s to 100s—your system needs to keep up with the incoming heat. To do that, it will run longer in order to maintain a constant, desired temperature in your home.

How long should AC run before shutting off?

15-20 Minutes

Related Question Answers

Aram Calderay

Professional

What happens if my AC unit is undersized?

An undersized air conditioner is too small to properly cool the home in which it is installed. This forces the system to stay on for far longer than it was designed to, resulting in the same issues as if the air conditioner was too large.

Sarbjit Boatella

Professional

How many hours should AC run per day?

In mild weather, a correctly sized and functioning AC will run in cycles of about fifteen minutes each. This is approximately two to three times per hour. If your air conditioner runs for less than ten minutes at a time instead, then it's probably oversized—too big for your home.

Hadilla Koglsperger

Professional

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

More specifically, for our area, most systems are designed to lower your indoor temperature about 20°F from the outdoors. So, on days when it's 100°F outside, and your system is running at its peak efficiency, your indoor temperature will likely never maintain a level lower than about 80°F.

Kiran Andia

Explainer

Why is my AC not shutting off?

The most common reason that your Air Conditioner fan won't turn off is because a stuck relay keeping the circuit closed. If it's not the relay, your thermostat likely has a shorted cable or needs to be replaced.

Abdessadeq Everson

Explainer

Why is my air conditioner not cooling my house below 80 degrees?

A dirty air filter
Your air filter is designed to trap contaminants in the air before it gets pulled into the AC system. But over time that means that your filter gets dirty and clogged. And if a dirty filter isn't replaced, it can seriously limit your AC's cooling power.

Rosalva Occa

Explainer

Why does AC run constantly?

An undersized system struggles to cool your home, which is why it's running constantly. This constant running will reduce pressure in the evaporator (cooling) coil until it freezes over. This is dangerous because the freezing can cause liquid refrigerant to flood back to the compressor and damage it.

Lancelot Koppula

Pundit

What should the AC be set at in the summer?

The Ideal Air Conditioner Temperature Setting Is 22-26°C
Most people find that a temperature range of 22-26°C is the ideal indoor temperature during the summer. Not too hot, not too cold, but just right. Studies have shown that for each degree you raise your thermostat, you can save 3-5% on cooling costs.

Cataisa Aldeanueva

Pundit

Is it better to let AC run all day?

The theory behind leaving it running is that the stable temperatures mean the air conditioner won't have to work as hard. If you let the house get hot when you're away, the air conditioner will use more energy when it's time to cool things down. It also helps your air conditioner work more efficiently.

Allan Borst

Pundit

Is it better to leave AC fan on or auto?

The fan only runs when the furnace tells it to. On cooling, the fan will run only when the air conditioner is running. Pros. The "auto" setting means less energy usage, because it keeps the fan running the least amount of time at the slowest speed needed for heating and cooling.

Assumpta Matencio

Pundit

Is it better to keep AC at one temperature?

Pros of Leaving Your Thermostat at One Temperature
Some simply find the steady temperature comforting, while others just don't want to go through the effort of changing it all the time. But as it turns out, the only real pro to keeping your thermostat one temperature is convenience.

Shumaila Mittasch

Pundit

Is it cheaper to leave AC on all day?

In general, it is cheaper to leave the AC on all day during very hot temperatures. However, it's not efficient to keep it on full blast all the time. Your exact results may vary depending on your AC system. So, it's best to consult a professional if you aren't sure about how to lower your energy bills.

Masum Ryom

Teacher

Why does my air conditioner keep running after it has reached the set temperature?

Without enough air flowing over the coils, the system can't remove humidity and cool the air to the set temperature, so it keeps running when it shouldn't. If your thermostat is not working correctly, the unit doesn't know to turn off even when the temperature is reached.

Darlena Bertoldi

Teacher

Does outside temperature affect air conditioner?

Outside Temperature. The lower the temperature of the outside air, the more cooling is done by the heat exchanger, instead of the compressor. When the outside air temperature increases, the air-conditioner works harder to cool the home because the compressor works more.

Hazem Westendorff

Teacher

How can I reduce my AC bill?

11 easy ways to lower your air conditioning bill this summer
  1. Upgrade your windows. If your home has old windows, they might not be energy efficient.
  2. Seal your windows.
  3. Install a programmable thermostat.
  4. Use ceiling fans.
  5. Replace your HVAC air filters.
  6. Avoid cooking indoors.
  7. Reduce the sunlight.
  8. Insulate your walls and attics.

Manola Fedchenkov

Teacher

Should the fan be on when the AC is on?

Increases Humidity
When the fan is set to “On” your AC won't dehumidify your home as well as it should. The air conditioning cycle continues to run as the indoor coil gets colder. Now water vapor (pulled from the air) begins to condense on the coil while passing over. If the compressor is turned off, the coil warms up.

Darek YtuarriƧaga

Reviewer

What is short cycling AC?

While the average air conditioning cycle lasts around 20 minutes, sometimes your air conditioning system can go through cycles too quickly—an issue known as “short cycling.” Short cycling is a term that means the air conditioner turns on and off in short bursts and does not heat or cool your house properly.

Janna Bauert

Reviewer

Does turning off AC save electricity?

But what we have been left with is a bunch of myths, such as: “Leaving your air conditioner on all day saves more money than turning it off while you're away.” The reasoning behind this myth is that by leaving your AC on, it doesn't have to use excess energy every time you turn it back on.

Iola Liepa

Reviewer

How long does it take a window AC to cool a room?

An individual unit can cool a room in less time than a central air conditioning unit typically can, if the door and all of the windows in the room are closed. A relatively small, 10-by-10-foot bedroom should become noticeably colder in 20 minutes, reaching a more comfortable, colder temperature in about an hour.

Wedad Agaphonoff

Reviewer

How can I run my air conditioner more efficiently?

Ways To Make Your Air Conditioner Work More Efficiently
  1. Schedule a maintenance check–up. A tune-up of your cooling system will ensure that it is working at peak performance and efficiency.
  2. Leave the thermostat alone.
  3. Keep the curtains closed.
  4. Use the dehumidifier.
  5. Keep your air conditioner out of the sun.
  6. Save chores for the right time.