Be careful on the air stat.
Typically floor warming is done at 10-12 watts per square foot. Space heating is substantially higher and could result in an overly hot floor.
The worst case was the death of an elderly man in Niagara-on-the-Lake through a total screw up.
The senior fell on the floor in the bathroom of his home, where Niagara Falls contractor Pro-Teck Electric had installed an in-floor heating system
nationalpost.com
The contractor installed a 120 volt cable but hooked it up on 240. Controllers have a maximum setting of 104°F but the sensor was air mounted so didn't detect the floor temperature. To completely bury himself the contractor didn't take out a permit, not that an inspector would have been guaranteed to notice.
For rough guesstimates each watt per square foot give a temperature rise of 2F°. When you double the voltage you quadruple the output so 12 W/SF becomes 48 W/SF and a potential temp rise of 96F° above the ambient. With an ambient of 70° F or higher the floor was well over the scald limits.
I'm not a fan of air stats. If you need to heat a room you need to do heat loss calculations and figure a safe way to do it. Overly hot floors can damage carpets etc.
