Well just got off the phone with an oge geothermal/hvac specialist and was told that at 1108 sq ft my house is too small for the geothermal to be financially worth it! So insulation, sealant, window insulation and tinting it is! Guess that saves a lot of guesswork...
Add two wind turbines to your roof. Get the sealed bearing types. They draw far more air threw then the peak or static vents even on a day with no wind.