Air to water heat pump – GreenBuildingAdvisor

blackfeet | Feb 16, 2025 11:07am | #2

Thank you. We will be insulating well. The climate zone is 4 marine. New Washington state energy code requires me to accumulate at least 8 “energy saving credits”. Because of this, we will be doing at least 5kw of solar (you get 1/2 credit for every 600 watts up to a max of 4.5 credits). Ore current c3 calculator is calculating heat required of 34,000 btu on coldest design day which is 25 degrees. We have a lot of windows but primarily .23 u factor. R60 ceiling, r23 walls, conditioned crawl. The most efficient way to heat this is with mini splits. But we love the idea of in floor heat. I certainly appreciate any thoughts!