The importance of thermal insulation in the construction of the built environment in Canada cannot be overemphasized. The impacts of climate change are felt in every aspect of our lives and infrastructure. Thermal insulations help us save energy and reduce the carbon footprint of our built environment. For all practical purposes, the thermal transmission properties of traditional thermal insulations are considered constant. Hence, the level of thermal insulation required considering the current climates will be inappropriate in future climates. In this context, the concept of climate-adaptive or dynamic insulation can play a major role in optimizing the energy efficiency and carbon footprint of our built environment. This paper will review the fundamentals of adaptive or dynamic thermal insulation and demonstrate its effectiveness in the Canadian climate context using selected results from numerical simulations. It is hoped that the observations presented in this paper will aid engineers and construction professionals in developing a better understanding of the opportunities and challenges associated with the application of dynamic thermal insulations in the construction of our built environment.