It makes sense for in floor heat but does it make sense for radiant heat? I put in floor heat in in our garage and basement floor of our house. I am not sure I want to go through all the effort and cost for the shop. I was thinking with radiant heat we could keep the thermostats on a low setting for most of the winter and turn up the areas we are working in when we are in there. It would give us fast heat when we need it and a much lower cost of installation. Would the boiler heat be a lot more energy efficient? I still not sure what to do. Good boilers are not cheap and only have a 15-20 year life expectancy. With in floor insulation could a guy do the perimeter 8-12 ft under the cement around the inside of the grade beam. Would it be better to chain trench a 4ft deep slot all the way around the grade beam on the outside and put a vertical 4ft 2 inch thick styverfoam in the soil on the outside of the grade beam to keep the cold from coming in?