If you find any air leaks (drafts), note them on your list. You can save up to 30% or possibly more per year once you get those taken care of. Look for things such as baseboard gaps, gaps at the edge of the floor, gaps in walls and ceilings. Check those areas to see if you feel air coming through. You would be amazed at the items you may find that need repairing.
Other places where you should check for drafts include:
If you can rattle windows and doors, there may be a possible air leak. Daylight in a door or window frame can constitute an air leak. Use caulking or weatherstripping to seal up the air leaks. Make sure the storm windows in your home are not broken.
If your home has old doors and windows, you will eventually need to replace them with those that are of high-performance and are durable.