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Old 08-21-2011, 06:53 PM   #46
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sizing choice on system upgrade


Look at your old furnaces CFM rating at statics/ESPs above .5".

Again, improve the homes insulation and seal it better. this will save you money in both heating and cooling season every year, year after year. A larger furnace just uses more fuel, and cost you more money year after year.
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Old 08-21-2011, 07:07 PM   #47
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sizing choice on system upgrade


The Bryant manual only has the single topline numbers for "certified conditions" between .15 and .5 so no way for me to check that. I might try to borrow a manometer and see what my actuals are. That would be interesting.

Not much to seal here. House is pretty modern. I guess I could put a storm door on the windward exterior door. Almost impossible to do anything in the attic with cathedral ceilings. Only an 8x8 area is accessible. Not sure what R-value the flex ducts up there are but replacing them would cost way more than any savings.



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Originally Posted by beenthere View Post
Look at your old furnaces CFM rating at statics/ESPs above .5".

Again, improve the homes insulation and seal it better. this will save you money in both heating and cooling season every year, year after year. A larger furnace just uses more fuel, and cost you more money year after year.
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Old 08-21-2011, 07:12 PM   #48
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sizing choice on system upgrade


Any switches or receps on outside walls? Also the ones on inside walls sometimes leak a lot also, if the holes in the plates at the attic and basement/crawlspace aren't sealed.If so, seal them. How about worn door seals?
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Old 08-21-2011, 07:17 PM   #49
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sizing choice on system upgrade


Yup, door seals could use replaced. Or just add a storm door on the windward door that is the main front entrance. The south side leeward doors (2) aren't so critical. The attic is impossible. I have cathedral ceilings so no way to get anywhere but an 8'x8' "attic" in the center of the house. Otherwise need a spry midget with a light and dust mask to try to crawl in the rafters up to the wall plates..... or rip out ceiling drywall. Not gonna happen!

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Any switches or receps on outside walls? Also the ones on inside walls sometimes leak a lot also, if the holes in the plates at the attic and basement/crawlspace aren't sealed.If so, seal them. How about worn door seals?
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Old 08-21-2011, 07:23 PM   #50
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sizing choice on system upgrade


Any sealing you can do, will help greatly. Also helps keep the indoor humidity up in the winter.
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