The answer to 'thermostat blowing hot air' is that your thermostat may be malfunctioning, causing it to blow hot air instead of cool air. This is a common issue that can be caused by a variety of factors, including a broken thermostat, a problem with the HVAC system, or a wiring issue.
Some common symptoms of this problem include the thermostat display showing the wrong temperature, the HVAC system running continuously, or the air coming out of the vents feeling warm instead of cool. If you're experiencing these issues, it's important to troubleshoot the problem as soon as possible to prevent further damage to your HVAC system.