At the time the furnace was purchased, Attic was only 2 inches loose insulation, full basement non-insulated. No heatload calc was done. they had this table they use. I figured should be similar to
The NEW furnace installed is Rheem 80% 2 stage: model RGPK-O7EAMER
As per sticker on the furnace: rated 1st stage: 52500BTU
2nd stage : 75000 BTU House is typical box with roof (barn type?) 1140 sqft area.After a year, I had added insulation to the attic (added R12 bats 3 layers). Also insulated the basement walls to R14 Roxul, sealed the sills tried to eliminate air drafts. I havent touched the old windows yet. Just used clear plastic to minimize draft.
This winter found out that running the furnace in 1st stage only, the furnace is able to maintain temperature. It appears like I don't need the
2nd stage. The temperature does not dip even at coldest outside. The 1st stage do run much longer before it stops when temperature is met.I guess my question is, do I have an oversized furnace?
Thanks,
Gerry