We had a heat pump and air handler install in our building in 2007 and have had a lot of problems, the lastest being we had to replace the compressor. The company that fixed the compressor said that the manufacturer would not warranty the new compressor because the heat pump is a 5 ton and the air handler is a 4 ton. They recommended that we replace the heat pump with a smaller one to match the air handler. My question is does this sound reasonable and would it be better to replace the air handler rather than the pump?. Here is what we have now: American Standard model 4A6H6060B heat pump and model 4TEE3F49B air handler. From what I have read it sounds like if the heat pump is larger then it could cause problems with the compressor. Thanks for any advice.