How Does an AC Turn On?

An air conditioner turns on by engaging its two main power switches.

Understanding AC Power Switches

Most central air conditioning systems have two crucial power switches, both of which must be in the "on" position for the AC to operate:

Indoor Unit Switch: This switch controls the power to the indoor components of your AC system, typically located near the furnace or air handler.
Outdoor Unit Switch: This switch manages the power to the outdoor condenser unit.

Locate the Switches: Identify the indoor and outdoor power switches.
- The indoor switch is usually near your furnace or air handler.
- The outdoor switch is generally located outside near the condenser unit.
Ensure Both Switches are On: Check that both the indoor and outdoor unit switches are flipped to the "on" position. If one or both are off, your AC will not work.
Thermostat Activation: Once both power switches are on, set the desired temperature on your thermostat. This activates the system, prompting it to start cooling.

If your AC doesn’t turn on, double check that both the indoor and outdoor power switches are in the "on" position.
Check your thermostat to make sure it's set to "cool" and the temperature is set below the current room temperature.
If the issue continues, consult a professional HVAC technician.

By ensuring both power switches are engaged, you can successfully turn on your AC system.