QuietWarmth® Radiant Heat Film for Under Subfloors

Radiant Heat - Subfloor

Quiet Warmth® radiant heat film for under subfloors is the perfect solution to add comfort and warmth to any existing flooring, including nail-down wood floors. Simply place the mats between the subfloor joist and run pre-attached lead wires to an available thermostat. Because it is an electric floor heating system, there are no hot water pipes to worry about, thick electrical cables to bury in cement, and most of all no messy installation. Retro-fit radiant heat to any of your existing floors to add gentle heat for your feet.


  • UnderFloor Warming Mat System installs between existing floor joists; from available crawl space or basement beneath
  • Keep your existing floors you love, simply staple the appropriately sized mats between existing floor joist beneath the flooring
  • Heat will radiate upward to heat existing flooring. (Insulation beneath heated mats, sold separately)
  • Thin and flexible film technology provides cozy and gentle heat with low cost operation
  • Simple to install, no messy mortars or glues
  • Can be cut to length with a pair of scissors
  • Efficient heat, only costing pennies per day to operate
  • Maintenance free design, control floor temperature with a floor sensing thermostat
  • It works under most types of flooring, including nail-down hardwood and carpet
  • Comes with 15' factory attached lead wires

Easy Installation

Step 1

Roll out film mat and staple to one side of joist.

Step 2

Staple the film mat to the adjacent joist.

Step 3

Run lead wires to junction box and install insulation below.


QuietWarmth Radiant Heal Film for Under Subfloors is available in four rollout pad sizes that will accommodate most any layout.

  • 16" x 5' - 120V and 240V
  • 16" x 10' - 120V and 240V
  • 16" x 15' - 120V and 240V

Technical Hotline 888-WARM PAD