Leaks around windows or other areas of your house allow cold air to continuously flow outside. This forces your air conditioner to keep running in order to try and cool down the house. There are two ways to remedy this problem. The most comprehensive option is to hire an inspector to do a blower door test and identify all leaks throughout your house. If you prefer to do the work yourself, feel around electrical sockets, light switches, doors, windows and baseboards for leaks. When you find one, use caulking or foam to seal it.