I'm replacing my 20 y/o AC unit and was told I should consider replacing my furnace (said American Standard Freedom VS 80 100,000 BTU).
I moved into this 2400 Sq ft 1975 two story last summer. We had gas bills over $300 during the coldest months last winter. I know I have inadequate insulation (which will be remedied this month) leaking duct in the crawl space (which I think I've gotten under control) and a large family room on a cement slab that always seems cold.
The furnace is in the garage, and seems to keep the un-insulated double car garage almost as warm as the house. Is this normal to have this much heat loss at the furnace? Its been about 50 degrees the last few days and the furnace has been kicking on every 10 -15 minutes and running for 4 minutes. Is this an appropriate cycle?
I've had three companies give me a quote. They all seemed thrilled to sell me a new furnace, but not concerned with the system as a whole. None of them did any calculations and just used the numbers off of the old furnace to determine what size I would need. I didn't really think that much about it until I ran into this site a few days ago and have become enlightened.
I expect to get some improvement on the system just from the duct work I've done, and the insulation in the attic. Should I replace the A.S. 80 VS for something new in the 93% AFUE range, or just try to improve the insulation and duct work some more, and ride the old furnace out?
Thanks in advance.