Living in a house with laminate flooring and underfloor heating, I can assure you that it is not a cost effective method of heating the room. True the floor is warm, but the heat reaches to about knee height with the air above it still cold. Having just come through this winter, I have had to have extra heating running to keep the room at 17 degs C. The under floor heating was wacked up to 30 degs and the room with just that on was still unbearably cold. I am thinking of installing wet radiators to the rooms with underfloor heating before next winter and the underfloor will be switched off.
The Rock Doc, February 2010