I have a 1100 sq CYV south of Spanish Springs built in 1995, but has upgraded attic insulation to greater than R-60 and new double insulated windows...also have an attached lani that is 260 sq feet and we use a mini split. We keep our temp 77 daytime and 71 to sleep overnight. July Duke bill $229 and August Duke bill $212. Prior to those hot months. June was $170 and prior to that the average was about $130.
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