Energy Savings with Thermal Insulation
In a fully insulated house up to 48% of the heat loss can pass through the windows. This is due to two processes occurring, conduction and convection. Conduction is direct heat flow transferred through a solid medium and convection is a transport of heat within a gas or liquid, caused by the actual flow of material itself (mass motion).
Warm air created from a heat source rises to the ceiling where it cools and is displaced by more rising warm air. As the displaced air cools, it travels down the walls to the floor.
Whenever this falling air comes in contact with cold exterior glass it will be further cooled. This faster falling air creates “cold spots” and convectional drafts that can often be felt coming from a window.