It is very common to have air leaks in the house. Many of them come from windows and electrical outlets. The average house in Canada looses up to 40 % of heat due to air leaks. Air sealing and weatherstripping can help to reduce amount of air leaks in your house. The electrical outlet air leak can be sealed with a weatherstrip outlet plate. These products can be easily found at Canadian Tire, Home Depot, Lowe's or other hardware outlets.