Quote:
Originally Posted by lucerne96
I am planning a low heat project now. The plan is to run PEX ALU under a standing seam metal roof, pull off the heat & bring it inside a super insulated building for underfloor heating. Building is R70 roof, R 50 walls, R40 under the slab in Philadelphia, PA area. Double stud wall construction - no thermal bridges. .6 ACH
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A house insulated that well has enough thermal storage from its own mass to make it through a cold night with little temperature drop. On the other hand, you may be surprised at just how little heat you will get from PEX tubing under a metal roof.