# sizeing furnace's[quicky]

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• 02-08-2005, 06:47 PM
roosterman
I calculate a furnace[quicky]average insolation ,no holes in wall's,etc,window's,looking,we'll insulated[weather stripped] 40btu's per square foot exampel 2000 squar foot liveing area multiplied by 40 btu's =80,000 btu furnace i would appreciate any feed back P.S yes a can read the cooling/heating load manuels,this has way save's me some time and it's worked good for ME[feed back wanted]
• 02-08-2005, 06:55 PM
billva
oh crap....
• 02-08-2005, 07:03 PM
Wild Leg
Too many variables.
I wouldn't use it.

Brave man to post it here...
• 02-08-2005, 07:11 PM
btexpress
There is no magic formula for all installations. There are way too many variables involved. If you have used load calcs in the past, I would suggest doing so in the future.
• 02-08-2005, 07:38 PM
BaldLoonie
You stand across the street and put your hand in front of the house. The number of fingers it takes to cover the house is the number of burners the furnace needs.
• 02-08-2005, 07:52 PM
beenthere
You said that way has worked well for you.
I guess that means you have never been undersized.
But, how do you know your not oversized by 30, or 40%?
• 02-08-2005, 08:06 PM
filterchanger
Hey guys I think after reading some of willies post that he is just jerking our chains,,,he cant be for real
• 02-08-2005, 08:11 PM
prtslnger
The Easy Way
Just ask your supply house guy "Hey I got a 2000 Sq Ft house. What size do I need?" And they will hook up!
• 02-08-2005, 08:15 PM
justri
no you are right as a quick refernce thats good. The only thing i do differently is if ther is a cathedral ceiling i take the cubic footage and x 5 and never had a problem
• 02-08-2005, 08:18 PM
fireye03
baldlonnie's stand across the street finger calculation works well for sizing a/c units 1 finger = 1 ton
• 02-08-2005, 08:28 PM
beenthere
Quote:

Originally posted by fireye03
baldlonnie's stand across the street finger calculation works well for sizing a/c units 1 finger = 1 ton
Also works for boilers, 1 section for each finger.
• 02-08-2005, 09:52 PM
karsthuntr
If he was doing my house I would have a finger for him. ;)
• 02-08-2005, 10:02 PM
pipedope
that is why he isn't a proffesional member!!!!!!! You can see his install work at the wall of shame.
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