This video gave a good education on how these things work. I have an American Standard pump and have always had issues with it when it’s gets cold outside. I’ve had the unit replaced and another set of coils replaced on my 2nd unit. When it starts up it always sounds like a it’s in defrost , sounds loud and blows cool air. After a while it will get warm. I wonder if I have an an issue with the emergency heat kicking in at start up. I added a wireless thermostat years ago and wonder if I messed it up somehow. After watching this I have a good understanding and can tell the service company what might be happening.
