An easy to use Heat Loss/Gain program recommended by Dan Holohan of HeatingHelp! HVAC-Calc software is from the makers of Lennox Logic Jr II, York SmartChart and Rheem The Master Calculate heat loss with HVAC-Calc - for Contractors and Home Owners Where is hvac-calc residential 40 and manual j and calculating air conditioner size and manual j software and heat load software and can find The HVAC Load Calculator recommended by Bob's Fix It Shop Where is hvac duct and hvac load calculator and NonSE_minisplitdirect.com and goodman heat pump and load calc and can find HVAC-Calc sizes boilers and hot water baseboard too!