Cold air - hot air - cold air
My 4-ton central ac unit is 8 years old. The Ac unit works normally for up to an hour then starts to blow warm to hot air.
If I shut it down for several hours it might start up cold again. If I leave it overnight it does start up cold then turn warm.
The Tech thought adding a kick-start cap might help. It did not. I get my system cleaned every season. Is there a relay or switch in an HVAC system that could be faulty? Or compressor?