We've been in our home for 2 winters. House was built in early 60's with concrete floors and hydronic heat. We also have conventional heat/ac. I had never had warm floors before, they are wonderful. We never use the conventional system for heat. Our home is 1400 sq ft ranch. Not terribly well insulated, but I find this heating to be the most comfortable, quiet, and economical system we've ever experienced. Our gas boiler installed about 15 years back, it isn't the "top of the line" for efficiency. We've found the warm floor allows us to keep the air temp a little lower. Biggest issue is the lag time when your weather takes a big change, house will be cool for a while until the floor heats up and starts radiating warmth, reverse is true, house will be warmer than desired when outdoor temp goes up, but floor is warm and still radiating.
