Load Calculations vs. Square Footage

[Dormer_man]

Withe good reason, Richard (Rabadger) always requests the load calculations rather than square footage when sizing a central AC or a heat pump.

Here are a couple of articles that discuss some of the issues on why square footage may be a poor indicator for sizing a HVAC unit:

http://www.proctoreng.com/articles/bigger.html

http://www.fsec.ucf.edu/bldg/pubs/ACsize/