I have to give my opinion on radiant floors after having them myself for over a year now.
I seriously know that radiant floors are the future of whole home heating. Right now the price of radiant floors are easily much up there and not all the people can afford them! But I think that in time, radiant floors are going to go the same way that central heating plus a/c did about 25 years ago! Which is that the prices will come down to where the average working class person can afford to get radiant floors for their home. It will be the way that all the people heats their homes in the future I think, central a/c will still exist for cooling until someone comes up with another more energy efficient concept, but the central heating plus a/cs will no longer be that, then they will be just stand alone central a/c units, then your heating will be taken care of from radiant floors throughout the home, and ever since I have had radiant floors not only has my energy bills been super low in the cold winter time months of the year, but also the way the radiant floors heat my home is like no other form of heating I have ever experienced. Everything is so warm with no cold spots in the home whatsoever. Also I have to say that the radiant floors deliver off a better form of heating than central heating plus a/c’s gas heating systems do.