As you know from my other thread, my architect was working (since mid-October) on a design for heat-pump placement that couldn't possibly work. (I'm surprised now that a heat-pump installer either let himself be convinced or convinced her that this was possible.) Now we have two alternatives that I can see:   1) installing the external element on the roof (probably optimal, though now the architect is saying this will involve delays and fees (payable to her), as well as reinforcing the