If your outdoor AC unit isn't turning on, check these switches, levels, and lines yourself, before calling for professional ...

split and whole house/building units, they still work the same, with the compressor, condenser and expansion stages. Extending the wiring for the AC unit’s controller board (Credit: HowToLou ...

The compressor is the power unit of the air-conditioning system that puts the refrigerant under high pressure before it pumps it into the condenser, where it changes from a gas to a liquid.