Ductwork design/furnace sizing
Hello all! So here's the scoop. My wife and I are putting in a modular home this coming spring. It will be a 30x36 cape style with a 12/12 roof pitch. The upstairs come unfinished. Plan is for me to to finish it off. I'm pretty handy so not a problem, been there done that. But when it comes to furnace sizing and ductwork( home comes with none) I'm at a stand still. I have used my local hvac guys for new installs and such, but feel I get burned every time. Why I end paying 3-4 times than the next guy is beyond me. So I guess what my questing is, is there any outside(online) sourcing I can do for the ductwork system design if I can supply floor plans? And do the installs myself.