QuietWarmth Joist Heat Mats for under subfloors are designed to add warmth to existing flooring, including nail-down wood floors and carpet. Installation entails stapling the flexible carbon film between 16-inch-on-center subfloor joists and running pre-attached lead wires to an available thermostat. The mats can be cut to length and come in 120V and 240V versions. We found a 17-inch-by-5-foot 120V mat online for about $50. mpglobalproducts.com

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