Actually it's a father/son business. The father pushes Natures Comfort, the son pushes P & M. He has 4 3444 is stock with 2 of those supposedly sold. In contrast they have about 30 NC's in stock. I get the sense he is just more comfortable with BL's. Also, the county they are in, next to the one I'm in, is very big in coal. And his point of the BL's being load and forget while the gasser's require more attention is somewhat true. In our mind though a 10 to 15% efficiency would be environmentally worth
it. When I read of 30 to 50% gains, I'm suspected that's not from BL to Optimizer.
On the heat load. Currently the heat pumps address 3300 sq ft which we'd like to expand to about 5500 plus 2 water heaters. Heat load calculations are a bit obscure
to me. I've read a normal home is 2 to 3 tons (or 24 to 36,000 btus) which would put our double at about 60,000 btu. The additions would seem to put it around
100,000. But the BL spec sheet indicates 4000 sq ft requires 225,000 btu and 8000 is 370,000. However, the Optimizer sheet shows 5000 sq ft at 190,000 and so on.
The relationship between manufacturer's furnace max specs and a/c tonnages doesn't mesh obviously. That is why I was hoping for some experienced input.
Thanks for your feedback btw.