I have a radiant heat system in a new house I just bought - given all the good things I have heard about it I was a bit surprised at the heating costs this past winter. I know that standard air furncaes have gotten a lot more efficient over the past 10-15 years - and as my system is about 15 years old was considering an upgrade. But given all that it is just a boiler (gas) it may be that upgrading to a new one won't make much difference - and it seems to work.
Anyoen know if the efficiency gains have been as great for radiat as forced air? Thoughts on how much more efficient?