It's been years since I was here but I always remember how good the quality of advice was when I had some questions years ago. Now I need to replace a heatpump for the third floor with refrigerant lines that travel through finished space up to a knee wall where the AH is located. Lines can't be easily replaced and I am going from 22 to 410a. So I am going to have lines run up outside wall in downspout.
I have two questions that I am hoping somebody can answer:
Any problem with running a lineset into the basement and then back outside to run up an outside wall? The location that the outside unit needs to occupy is such that this would work best if there are no issues.
Finally, I am looking at Carrier 15 seer performance series HP and wondering if there are any disadvantages to the compact units. I see the HSPF rating is a little lower, and I assume they cost more, although I don't know if it is significant. I'm comparing 25hpa5 series to 38QRR series (two ton units).
Any comments would be appreciated. Many thanks.