Then how can it be undersized? If it is undersized, it will not be able to meet the demand at the design conditions, will run continously and not get the temperature to what the theromstat is asking for. If it is oversized, then it will short cycle.Originally posted by thorton
Certainly does sound undersized. A furnace that small in a 2000 sq ft home should be running almost all the time, right?Originally posted by jeffshvac
i wonder if a load calc was ever done 45,000 btu furnace with a nearly 2000 sq ft home?sounds a little undersized.
For what it's worth, I have a 1950 square foot house in a much colder climate (average 7560 degree days per year). The house is old (108 years) and not too well insulated by today's standards. At the design temperature of 14F outside, 69F inside, the heatpump runs continuously and supplies about 40kbtu/h. I'm always astounded at the seemingly massive furnaces people talk about installing here - it's almost as though there's some macho pride in saying "yeah, I have a 185kbtu/h furnace". All that says to me is either their house has crappy insulation and/or they've wasted their money on equipment which is completely mis-matched to the task at hand.