Preventing freezing water lines in slab
I recently purchased a slab home with in floor radiant heat. Slow heat up times coupled with fast heat loss & high heating bills make me wonder if the slab was properly insulated. I am considering relying more upon the backup forced air unit to cut costs. My concern is that all of my plumbing runs through the slab. How low can I drop the in floor heat without risk of freezing my water pipes? Could I ever rely upon only the forced air for heating - does that warm the slab enough to prevent frozen pipes - I'm guessing not? Also, I live in Minnesota where January highs are sometimes below 0.