Be sure to install caulking around all the openings on the outside of your home. This includes all windows, doors, dryer vents, electrical outlets, telephone cable boxes, cable TV boxes, electrical boxes, pipes, and any other openings on the exterior of your home. One thing to remember when looking for air leaks is that you want to make the air inside your home stay inside.  If you do not, you will be heating or cooling the outside with any air leaks. Caulking is the best remedy to fill these small holes and stop the heat / cool loss. Caulking can be done by yourself and save you as much as $200.00 per year in energy bills. A good sign that you have an air leak is the appearance of any light coming in from the outside. No matter how big or small the leak is, the bottom line is that air leakage in the form of hot or cold air is a waste of energy. A tube of caulking will run you around $4.00 per tube and the caulking gun will cost around $2.00. I think we can all agree that this would be a great return on your investment.  Try this web site for more information: www.dap.com