Quoted from not4tilts:
I am moving to the beautiful state of Wisconsin (escape from Illinois!) and our new house has in floor radiant heat in the cement. I was considering an epoxy type floor but am leaning toward carpet for the acoustics. Does anyone have any pros/cons/recommendations with regard to carpet over radiant heat? I like to work on games and the room I have now has a cement floor and is really easy to move games and clean up. Seems like carpet might reduce heat transfer some.
Here's pics of the new space.
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Opinions from Snow Mexico (i.e. Canada).
I have had three homes with radiant in floor heating and there are ZERO issues with heat transfer when the slab is covered with underlay and carpet.
Radiant heat is more efficient than furnace heat. Run the radiant thermostat at a higher temp than the furnace thermostat.
Carpet and underlay is nicer on the feet. But that brings up another debate about wearing shoes in the house. (In Canada that's a big no no, but depending on your State taking shoes off inside a house may be considered odd.)