I think the thought about high ceilings was a good guess as to why so high. 1500 sq. ft. with mostly flat 8 foot ceilings is not the same as 1500 sq. ft. with volume ceilings. I don't want to do the math right now but I'll bet it is around 40% more cubic volume in homes with volume ceilings as it is in homes without them. Also I think that every degree below 78 may be somewhat of an exponential raise in energy use. Most ACs work very well in cooling/drying down to 15 degrees below outside temp. We keep our home very cool (72) up here in MA due to our daycare setup and we pay the price during the summer. As much as $450 during the 3 main summer months.
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