The answer to 'thermostat blowing hot air' is that there are several common causes, including a malfunctioning thermostat, issues with the HVAC system, or problems with the wiring. Symptoms may include the thermostat display showing the wrong temperature, the HVAC system running constantly, or the home not reaching the desired temperature.
Some potential solutions include checking the thermostat's batteries, calibrating the thermostat, or inspecting the HVAC system for any issues with the compressor, refrigerant levels, or ductwork. If the problem persists or you're unsure of the cause, it's best to call a professional HVAC technician to diagnose and repair the issue.