We have currently solicited multiple bids to replace our A/C unit. We are looking at low cost options since we will be selling the house within the next year. I am getting conflicting advice from different contractors so I was hoping for some advice from people who do not have monetary gain involved.
Part 1: (Keep existing evap. coil or replace)
Two contractors have advised it would be okay to keep our existing 6 year old Carrier CD5A coil (certified R22 and R410) which is currently running R22, but upgrade it with a R410 TXV and replace the leaking 12 year old A/C unit with a new R410 unit. Keeping costs in mind this seems like a feasible idea. But another contractor told me this was a bad idea and when they have done this before it always resulted in failure of the new A/C compressor, sometimes in as soon as 6 months. Is it safe to keep the existing coil? If so, what prep should I be making sure they do to make sure the coil will not cause problems with new R410 unit.
Part 2: Carrier vs Payne
Our deck was built around the concrete pad that the outdoor unit sits on. We live in townhouse limited area to put unit. So the two units we are looking at are a Carrier 24ABB and a Payne PA13NA. These are the only units that will fit in the existing space without modification of the deck. As far as I can tell these two units are identical. Could someone tell me if I missing something in comparing these two units? Why should I pick the more expensive Carrier unit over the Payne?
TIA -- Patrick