That temp is about the ball park for radiant. It doesn't take as high a temp since your heat exchanger area is large. Slabs to have lag affect and can take a bit to warm up and cool down.
Your idea sounds interesting but I would skip it go just insulate the foundation and stick with tried and tested. I would also put pex into the slab for radiant.
Keep it simple and insulate first before other strategies is always a safe and cheaper bet long term.
|