Thermal Envelope may be the exterior building envelope or it may be portions of the exterior envelope and portions of interior elements. The thermal envelope is the barrier used to protect your interior environment from heat transfer from inside to outside. The effectiveness of this barrier is dependent on insulation levels, air tightness, and thermal properties of windows and doors.
Improvements in the thermal envelope can reduce heating and cooling requirements dramatically over code compliant construction practices at little to no added costs. The thermal envelope is the first line of defense in a home or office for comfort, low energy bills, and healthy indoor air quality.