View Full Version : rule of thumb
10-18-2006, 12:53 PM
the old rule of thumb for sizing cooling was i think 400sqft per ton? is this still true? residental
10-18-2006, 01:01 PM
10-18-2006, 01:32 PM
Depends how big your thumb is. If only it were so easy to rule of thumb it and be accurate. That could be right for some area's, could be waaaaay oversized for others, even varied per house.
There's a nifty (cheap) program called HVAC-Calc (look on the top of the page), that'll take your thumbs out of the process ;-)
10-18-2006, 01:39 PM
See, ya stands across the street and holds up your paw in front of your face. The number of pinkies it takes to cover the house is the number of tonses you puts in the house.
Well, about as accurate as the sq ft per ton method :D
10-18-2006, 01:44 PM
here's the thing with rule of thumb sizing....
2 tons of cooling may be right for a particular 1000 square foot home in a Northern region of the country, but does that mean 2 tons of cooling will be adequate for a 1000 square foot office building in Arizona filled with people and computer equipment?
see the difference?
use a load calc program and be sure.
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