How to Turn Off an Air Conditioner

Even the best air conditioners run into mechanical problems. When this happens, one of the first things HVAC experts will implore you to do is turn it off. This task sounds simple — and it is — but there’s a proper way how to turn off your air conditioner. To turn off an air conditioner, first locate the power switch, which is typically on the unit itself or on the wall. Turn the power switch to the ‘off’ position. If your AC unit has a remote control, ensure it is also turned off, or the batteries are removed.

And as a logical next step, you can also read our article on how to turn on a central air conditioner.

Additionally, if you’re stuck on AC filters, you’ll want to consult our guide on what size air conditioner filter do I need.

The Correct Way to Turn Off an Air Conditioner

People need to turn off their central air conditioning units for many reasons; for instance, during winter months, the blower is used to circulate warm air for comfort. This sometimes means unlocking the A/C thermostat first. Sometimes it is to lower energy costs or mechanical issues — like poor electrical circuit connection or a refrigerant leak. You also might need to turn it off for running tests (see how to test an air conditioner compressor). Other maintenance is cleaning and straightening out the air conditioner fins and unclogging the air conditioner drain pipe.

However, the primary cause of reduced cooling capacity and energy inefficiency is a dirty condenser coil, dirty blower fan, and dirt clumps blocking airflow.

These are all circumstances under which you’ll need to know how to turn your AC completely off for a longer period of time. Below is a step-by-step guide on how to do this safely and efficiently.

STEP 1 Turn the System Off

1. Go to your programmable thermostat and push the power button until the thermostat setting shows that the system is now off.

STEP 2 Check the Air Filter

1. If you are getting ready to switch over indoor temperatures from AC to heat for the winter, check to see if you have a dirty air filter. If so, purchase a new filter and replace it to maintain good indoor air quality at comfortable temperatures.
2. If it’s washable, clean it with soap and water, then let it dry before placing it back in the unit.
3. Switch the humidifier vent from the closed position to the open position.

STEP 3 Disconnect the Unit from Power or Locate the Breaker Box

1. If you have central air, go to your outdoor central unit, locate the breaker box that connects to it, and then find the electrical disconnect switch that connects directly to the AC unit.
2. If you have a window or portable unit, unplug it from the wall.

STEP 4 Inspect the Central Air System for Damage

1. Examine each electrical component in the breaker box for damage or burn marks.
2. If any damage is identified, call an HVAC professional to come and assess the damage.

STEP 5 Shut the Power Off to the Central Air System

1. Go to the electrical box and find the switch or lever that controls the power.
2. Switch it to the off position.
3. If you have a waterproof cover, go ahead and put it over the AC unit.

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