Date: 4/10/2008 11:05 am EDT
What heat mat are you considering? Avaire tile is compatible with any in-floor heat system that ensures the temperature is maintained at 115F or less. Since most radiant heat systems are designed to work with engineered wood, and wood requires the temperature to be less than 85F, Avaire tile is compatible with those systems. You should verify the maximum temperature is less than 115F.
You'll need to check with the heating system maker's policies about their mat protruding under carpet.
Short answer: Avaire tile is definitely compatible with most infloor heating systems!