Is my furnace oversized and efficient?


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Old 12-04-10, 09:46 AM
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Is my furnace oversized and efficient?

I bought a house in the Detroit MI area in 2008. It was built in 1934. The furnace is forced air gas Ducane Model MPGA075B3 that is 80% with 75000 btu input. There is also central air attached to the furnace.
The house has a 563 sqft basement, 582 sqft main floor over the basement, 213 sqft addition not over the basement and 332 sqft second floor. There is a supply to the addition with an inline fan. There are 4 supplies and 2 returns on the main floor. The upstairs has 2 supply and 1 return duct.
I have the thermostat set at 60 F. I am only heating the main floor of 582 sqft. It has used 400 ccf for the last 2 winters.

Is the furnace the proper size?
Is the amount of gas used reasonable?
 
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Old 12-04-10, 10:17 AM
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There are many factors to consider when sizing a furnace. There are programs available on the net to help you figure the heating requirements of your home. Search the net for heat load calculators.
 
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Old 12-04-10, 06:11 PM
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What is your gas bill for the month or on cold months??? Your bill in the coldest month with 582 sq feet( if thats where the t stat is should be around $ 150)

Yes????


Mike NJ
 
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Old 12-05-10, 10:31 AM
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The cost of gas is about $1 per ccf (100 cu ft). In the coldest month of January, the bill is over $100.
 
 

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