If your thermostat isn’t telling your system to work, it won’t switch on.
The most important step is checking it’s set to “cool” and not “heat.” Otherwise your air conditioner will probably not start running. Or you may have. warm air blowing from vents since the furnace is on instead.
If you have a regular thermostat:
- Swap out the batteries if the readout is empty. If the readout is displaying garbled characters, get a new thermostat.
- Make sure the proper mode is showing. If you can’t update it, cancel it by decreasing the temperature and pressing the “hold” button. This will force your AC to work if the configuration is wrong.
- Try setting the thermostat 5 degrees cooler than the space’s temperature. Your AC won’t cool if the thermostat is set the same as the room’s temperature.
Once your thermostat is set accurately, you should receive cool air quickly.
If you’re using a smart thermostat, such as one produced by Nest, Ecobee, Lux, Honeywell or Bosch, go to the manufacturer’s website for troubleshooting. If it still won’t work, call us at 361-265-4371 for help.