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New London, Wisconsin | What Paul2sd said is also what I was told by my heating and cooling people.
That said, there is a bit more to the story.
Paul's house and my house, per his description, are almost exactly the same size, same age range and same size furnace as built new. When mine was due for replacement I asked about upsizing to a larger unit. The reason was in bitter cold days during winter, it ran constantly and I feared it could not keep up if it ever got colder. That's when I was told it was sized perfectly for efficiency. I asked for a larger unit and got it. A 75,000 btu furnace and I like it a lot better. We have not noticed any unusual pattern in utility cost. But the house feels warmer. The reason is if you set your thermostat at 72 and forced air comes into a room at 80 it will work fine. But skin temperature being in the 90's doesn't feel as warm. Stepping up 10-15% does make that air a bit hotter and I found more desirable.
100,000 for an upstairs won't run long unless it's not sealed well or insulated to new standards. It might be overkill but I did not see how big that upstairs is.
Jim | |
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Oversizing a home furnace
