Whether it's summer or winter, energy moves through the walls, roof and cracks of your home. Either cool air conditioned air is lost to the outside during the summer or cold winter air is finding its way into your home during the winter.
Where does a home lose heat energy? Well you can generally categorize it into five areas:
- Floors and Below Grade Space
- Windows and Doors
- Infiltration (air leakage)
- Infiltration / Air Leakage: 35%
- Windows and Doors: 18%-20%
- Floors and Below Grade Space: 15%-18%
- Walls: 12%-14%
- Ceilings: 10%
Focus on buttoning up your home to air infiltration and leakage first including windows and doors, then focus on investing on insulation. Also, considering insulating the attic first. Although less heat is lost there than the walls, it is much less expensive to insulate the attic than the walls.
Do It Yourself Home Energy Audit
Here is a great source of information on doing an energy audit on your home and finding ways to improve the energy efficiency of your house. This comprehensive checklist provides you a way to evaluate your home and identify and prioritize potential energy efficiency upgrades.