I have a 4 ton 10 SEER Coleman/Intertherm system with a Nordyne A-Coil. The A-Coil keeps freezing up, and I have pretty much determined that I have a leak, and that more than likely it's the A-Coil. Having said all that, I was advised that I might be better off getting a new system. If I do get a new system, do I have to go back with the trailer crap that I had before (or some other name brand trailer crap)? I got less than 6 years of service on this equipment so I would like to have something that I can rely on. Second part of the question is; would I be able to change out say the outside unit and the inside A-coil part without changing out the heater portion (trying to save money)? Sorry for being so long winded. Any advice is appreciated.