Legalett Radiant Systems

i have had to trouble shoot a system of simalar design early this winter ,it was of homemade design and i would gather it was based off a design the original archatech had come up with it's responce time was terrible and i guess when designed oil was like 20 cents a gallon so it did not cost much to heat but as time went on between critters and surrounding water table and more homes being built ,roads and less open land to drain rain waters it ended up costing a small fortune to heat the slab enough to make the home comfortable .they where using standard oil hot air furnace and they cycled on limit ,i believe ther a waste of fuel and energy and really don't offer the same comfort of wet radiant systems clammy