I've been on Rheems site looking at gas furnaces for an 1129 sq ft house.
BTU will be somewhere around 60.
Rheems site has extensive literature about their units.
I'm looking at the RGTK Classic 90, 90TJ Value Line, and the RGPN CLassic 80.
Looking for the goods and not so goods.
If this is the wrong forum, please advise and I'll move