To make a long story short I've have a bad experience trying to get some repairs done to an existing aire-flow unit. $800 later I'm scrapping the unit. I've ordered (online) a new Rheem Classic 3 ton 13 seer condenser, coil and 100,000 BTU gas furnace. I am not going to try to install the unit myself, I just want to gain some knowledge before I get someone to install it. I plan on requesting that they install a thermostatic expansion valve, a liquid line dryer, a liquid line sight, and a suction line dryer. Is that overkill? Any input would be appreciated.