I just had a new compressor put in my five ton Carrier Infinity. Gentleman came out and fixed it fast. I was not home when he came so didn't see him work. I was sitting down to do a review and decided to go outside and look over his handy work and noticed that he didn't replace the original filter dryer on the system. Unless things have changed, my dad as an ac man and never changed a compressor or condenser unit without a new filter drier. I thought I would ask here to see "what the norm" is before calling him or placing my review.