Zip code 95460. The house has energy compliance heat loss calculations to predict how it's supposed to perform. They were part of the permitting process, and they predict 17k BTU/hr loss in the worst case. As an aside, I have professional heat loss calcs for my current residence which I built 25 yrs ago, and I'm monitoring our heating system in order to calculate the actual energy required to maintain the comfort level of the house. It will be interesting to see how they compare. We have a mild climate stabilized by the proximity of the Pacific Ocean and not hard on a heating system.
The plans call for a geothermal heat pump to provide space heat, but that's another story.
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