I recently had a new Amana, dual fuel, 2 stage heat pump installed. I also had a new variable speed, high efficiency, 2 stage gas backup furnace installed. The system is hooked up to a honeywell vision pro stat. After the installation I had some issues with the ductwork so the installer sent out a tech. The tech corrected the ductwork but said the system wasn't programmed correctly. He said the heat pump and furnace were turning on at the same time. Obviously this shouldn't happen. According to my wife he spend between about 2 hrs correcting the problems, but he said he has it fixed. This is the first time I've owned a heat pump. Here are my questions:
1. Has the simultaneous operation of the furnace and heat pump damaged the system?
2. Now I notice that the blower sometimes kicks on and blows out what feels like cool air. When I look out the window at the compressor I notice it's not on. When the compressor turns on in a minute or two the air heats up (although not as much as when the furnace is on). Is this correct system operation, or should there be no air flow until the compressor is on?
3. I definitely notice that the furnace blower is sometimes blowing softly and other times it ramps up to full speed. What controls the system's fan speed decision?