If your thermostat isn’t telling your air conditioner to work, it won’t turn on.
The first point is ensuring it’s switched to “cool” and not “heat.” Otherwise your air conditioner might not turn on. Or you may get. heated air moving from vents because the furnace is going instead.
If you’re using a regular thermostat:
- Swap out the batteries if the monitor is blank. If the screen is presenting garbled numbers, get a new thermostat.
- Ensure the correct mode is on the display. If you can’t change it, cancel it by dropping the temperature and pressing the “hold” button. This will make your AC start if the configuration is wrong.
- Test setting the thermostat 5 degrees cooler than the room’s temperature. Your AC won’t cool if the thermostat is set the same as the room’s temperature.
Once your thermostat is calibrated properly, you should start getting cool air quickly.
If you have a smart thermostat, like one produced by Nest, Ecobee, Lux, Honeywell or Bosch, go to the manufacturer’s website for troubleshooting. If you’re still having problems, contact us at 703-260-1148 for assistance.