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hdnvn
Nov 25, 2007, 03:56 PM
I have one furnace in my 5000 square foot houswe and want install an additional unit for the upstairs, separating the house into a split system. How do I go about calculating for this? I want gas heat and AC in the attic to supply the entire second floor. Thanks

KISS
Nov 25, 2007, 04:12 PM
It's not as easy as it seems. This should answer your question. HVAC Software, HVAC-Calc for Heat Loss, Heat Load Calculations (http://www.hvaccomputer.com/)

What your looking for is called "Manual J" calculations.
"Manual D" calculations are use for duct design.