The TomorrowHouse® TH-1 Thermostat Plus™ add-on device fits and works with almost all forced-air heating systems and has been listed with Underwriters Laboratory and has CSA approval.

TomorrowHouse® TH-1 Thermostat Plus™ add-on device is installed on the outside of your furnace's plenum (The central point on top of your unit where the ducts come together). It is then wired into your thermostat and calibrated. Once installed and calibrated, it requires no further attention.

Your TomorrowHouse® TH-1 Thermostat Plus™ add-on device is backed with at least a 20% savings guarantee and will go on saving year after year. In addition to saving you money on your heating costs the TomorrowHouse® TH-1 Thermostat Plus™ add-on device will also provide improved comfort from more even temperature to the controlled space.