We will be building a home and will only have propane and electric for heating and ac. Rural area. Home will be approximately 1700 sq ft. Location is Central California, coastal inland. Will freeze winter nights (below 28 for usually 6wks, around freezing for 6 wks, low 30's for an additional month and days warm to 50's to low 60's). Normal average summer temperature is high 80's to low 90's, and it will get over 100 (14-21 days of around 100 - 105). Summer nights cool to the 60's normally at night, so wouldn't use AC often. However, it was 117 (all time high in the 20 years I have lived here) on Saturday, so I would like to have AC on those over 100 days - especially to cool the house at night. Also, would a whole house fan be a good option to complement whatever system that would be best? Thanks all!