| Thermostat | The batteries in your thermostat may be dead, or the thermostat may not be on the correct setting. | Put new batteries in your thermostat and ensure that it is on the cool setting. |
| Circuit breaker | The breaker switch may have flipped. | Move the breaker switch back to the “on” position. |
| Not blowing cold air? | Air filter | If the filter is clogged with debris or dust, it won’t be able to do its job. | Replace or clean your air filter so that air can flow freely. |
| Outside unit | The air conditioner may not be able to have air flowing freely if there are dirt and debris around the unit. | Make a two-foot space around your unit that is clear and free of leaves, greenery and any other blockage so that it can vent air properly. |
| Refrigerant | If the refrigerant is leaking, your unit will not be efficient at cooling since there is less cooling fluid to run through your unit. | Get a technician who can solve this problem. |
| Insulation | Insulation is important to keep air from leaking out. Cracks, old windows and doors are all spots where cold air can escape. | Windows are the main places where cool air escapes. Consider upgrading to insulated windows or use blackout curtains. |
| Dripping water? | Condensate line | The pipe that exits your air conditioner could be clogged. | Blow compressed air through the pipe to dislodge the clog. |
| Drain line | Water can overflow in the drain pan if the drain pipe is blocked. | Check the drain line for any clogs and remove them. |
| Making odd sounds? | Blower motor or belt | Squealing sounds can come from the belt or the blower motor. | Use lubricant on the parts to help them run better without squeaking. |
| Fan blades | If the sound is repetitive like a card stuck in a bicycle spoke, there is a chance something is caught between the blades. | Switch your unit off and check the fan blades to see if anything is trapped and remove it carefully. |
