@ gerdesj:You should see what I've done to my U/F heating. I nearly cooked the dog.
OT from the point of the article but never mind...
Some friends of ours had a major refit of their home after an equally major flood a few years ago, and that major refit included underfloor heating. In this case the ground* - to - room interface was some very nice tiles. The effect was to nearly cook anyone who entered the room, particularly in what used to be called "stockinged feet". (Curiously their dog didn't seem to mind.)
I had a quick look around and discovered that (a) there didn't appear to be a room stat, (b) what might loosely be called the "control system" was at the back of a cupboard at ankle height, (c) the "back of the cupboard" was actually the outer leaf of the wall, and (d) it was noticeably draughty in there.
Needless to say I was unable to keep the diagnosis to myself, and I advised them about what to tell their installer, including the results of a quick on - line search for a suitable wireless thermostat, etc. I suspect their installer was a bit hacked off about someone else telling what was required, but he did it anyway, and the result was a properly controlled temperature.
It's quite amazing how non - technical friends will interpret "basic engineering principles" as a branch of black magic and general wizardry, and it would have been inappropriate to dismiss the whole thing as "Simples".
We wizards need all the adulation we can get.
*Yes it really was the ground; it is a very old house.