> My personal electric bill with my heat pump is also about 2x as expensive in the coldest winter months (heating from 25°F to 70°F = +45°F) as in the warmest s

> My personal electric bill with my heat pump is also about 2x as expensive in the coldest winter months (heating from 25°F to 70°F = +45°F) as in the warmest summer months (cooling from 90°F to 70°F = -20°F). What is the typical humidity at 90 F where you live? As my previous calculations showed, that makes a huge difference to the heat transfer required. From the costs you give, I suspect your area is not very humid (say 50% RH at 90 F, vs. 80% or 90%, which is more typical in a hot, humid climate). For a home, there are also other significant variables, such as how much sunlight vs. shade your home gets, how well insulated it is, how often you open the doors and windows, etc. Those variables can affect heating and cooling differently, which makes any comparison harder.