[Billbo]

When I built my barn I installed radiant hot water floor heat with long term heat storage. Started with a 6 mill vapor barrier, 2" hard foam insulation then 1800' of pex, 8" of sand on top of the pex and 4" of concrete to top it off. The entire structure was spray foamed. I keep the thermostat at 60 and it is a absolute joy to work in. The floor heat and spray foam was the best money I've spent. It has an 18' ceiling peak but it is warm where it counts. Winters here get a wee bit below 0. When I build my home it will have radiant floor heat.