Heater comes on instead of air conditioner?

If the heater comes on instead of the air conditioner, it could be due to a few reasons. First, check the thermostat settings to ensure it's set to "cool" rather than "heat." Additionally, there may be a malfunction in the thermostat or a wiring issue that is causing the system to switch to heating mode. If the problem persists, it might be best to consult a professional HVAC technician for further diagnosis and repair.