I'm looking to build a small single level passive solar orientated house with double walls or Larson truss (either would have dense pack cellulose) on a slab foundation with radiant in floor heat. I saw a post with a chart showing code built, better insulated and super insulated. The chart showed monthly payments (mortgage and untilities) and the better insulated home had monthly savings over the code built house while the super insulated house cost more per month due to the added up front building cost. I'd like to aim for the better built house with instant payback but how do I determine how much insualtion to use? EPS under slab and on side, dense pack cellulose in walls and loose pack cellulose in ceiling. Thanks.
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