How to deal with oversized furnace?


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Old 11-16-10, 04:13 PM
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How to deal with oversized furnace?

I have a 2000sq/ft split level with good insulation, 80% 75,000 btu input furance and honeywell tstat set to 3CPH. With this configuration I get quite a bit of short cycling, the tstat will call for heat every 20mins of so and only run for 2-3 minutes then turn the burner off. Should I set the CPH down 1 to 2?
 
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Old 11-16-10, 05:03 PM
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Is the stat near a vent? A false reading will throw it off and cause it to shut down soon.

Has it always done this or just started it?

You could try 2 and let it relearn for a day or two.
 
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Old 11-16-10, 05:39 PM
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Originally Posted by Jay11J View Post
Is the stat near a vent? A false reading will throw it off and cause it to shut down soon.

Has it always done this or just started it?

You could try 2 and let it relearn for a day or two.
No, it's accurate... no vents near stat and it's always done it, just way too much furnace for the space... I set it down to 2 and it seems to be much better. But still paying too much for BTU's that aren't needed
 
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Old 11-16-10, 06:21 PM
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So? Turn it down to the minimum and see if that makes things more comfortable.


The only time a heating system is "properly sized" is on the coldest day of the year for which it's designed. When it's warmer out, heating systems are a compromise in various ways.

When it gets colder I would suppose you'd want to set the cycles higher, But for the "shoulder" season when you don't need much heat, by all means reduce the cycles and see if that helps. That's what it there for.
 
 

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