We plan to build a house in one to two years. What is the best active heating source? Radiant heat? Is embedding the pex tubing better in 1) concrete, 2) lightweight concrete, 3) aluminum plates above a 1 1/2" floor deck, or 4) aluminum plates under 1 1/2" floor deck???? Is there a quantitative comparison? Does radiant create a type of heat that rises such that ceiling height matters in a well-insulated house? Should I cycle the heat back down with ceiling fans or tubes/ducts with fans? I will face the house to the south and have a small solarium.