House too large for one system?
Total replacement of gas furnace and ducts, also adding A/C. I personally wouldn't pay for A/C in my area, but it will probably make the house easier to sell when the time comes.
Fairly mild climate, San Jose, California, 95132.
The house is single story L-shaped over crawlspace, about 3400 sq ft. I come up with 93k BTU/hr peak heat loss after I remodel. Heat gain isn't too bad, thanks to decks with overhanging roof; very little sun-glass exposure until a couple of hours before sunset.
Too large for a single system?