All - I am helping a relative who is in the process of purchasing a Kohler generator. Just for some background, this person owns a 2,200 sq. ft house (on a slab + 2 car garage) in the Deep South (think AL, GA, NC, SC etc) and is looking for a generator that can essentially allow them to operate at business as usual capacity in the event of an outage, brownout, etc. (Essentially, they want to be able to run a normal set of electrical equipment furnace, AC, refrigerator, etc. along with lights with some power left to spare; just to add, they have upstairs/downstairs AC/heating units). My relative got an estimate from a local dealer rep which Im including below. 1) Is it conventional to calculate the power needs of the AC / furnace together - are they really additive like this quote suggests? Im not an expert by any means but right off the bat, it strikes me as somewhat aggressive in terms of calculating power needs (not to mention a calculation error in determining the power needs for the lower power generator). 2) Also, both of these models retail for significantly less than what this quote suggests - what factors would drive those costs up to those levels? Any help would be greatly appreciated. More than happy to answer any follow-ups. Thanks much.