Steve chiro
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I am building a new home and sealing the entire envelope and roof deck with closed cell spray foam insulation. I believe that I can only put a high eficiency non combustible furnace in the attic as the whole attic is non vented. My HVAC contractor wants to instead build a closet or small room around the furnance and vent just that room to the outside while keeping the attice totally nonvented. He states that he prefers to put an 80% efficiency furnace in an attic. Any thoughts? Also If I use spray foam over batt insultaiton how much can I cut back on heating BTU's and air condition tonage. My HVAC contractor wants to put in the same units that he would as if the house was insulated with batt insulation in a vented attic.