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Don't let your hard work, electricity payments, and cool air go out the window! The New York State Energy Research and Development Agency (NYSERDA) offers the following tips.

First, if you're buying a new room AC, be sure to select an ENERGY STAR(r)-qualified model, which will save you more than $100 in energy costs over the lifetime of the unit.

Next, installing your room AC unit correctly can save a bundle in energy costs, too. Researchers have found that the average room air conditioner leaks as much air as a six-square-inch hole in the wall.

Here are some tips for installing units most effectively:

• Seal the unit's top and bottom: Since most portable air conditioners are installed in an open window, the window must be lowered onto the top of the unit. Even if it looks like the window is tightly closed, there is usually a space between the unit and the window where air is leaking. Use a foam strip to insulate the gap where the two sashes meet.
  
  
• Home improvement stores sell kits to insulate your AC unit, which include foam rubber strips that squeeze into small spaces for a snug fit.
  
  
• Hardware stores sell foam insulation for pipes, usually in the plumbing section, which reduces "sweating" of the pipes in summer. These are usually available in various lengths, but you'll only need 3-4 ft. Be sure to buy the insulation for a 2-inch pipe, approximately the same size as the bottom edge of a window. Open the insulation where it is split and push it along the bottom of the window.
  
  
• Check the sides: When you expand the accordian-like sides on the AC unit, be sure they are not cracked or split, and that they fit snugly. Replacement units are available at most hardware stores.
  
  
• Don't forget the area between the upper and lower sash: Be sure to insert foam insulation in the space that is left when your window is open.

NYSERDA also recommends the following tips to maximize the operation of your window-type AC unit:

• Size it up: A properly sized air conditioner will operate more efficiently and dehumidify more effectively.
  
  
• Stir it up: Run ceiling paddle fans on medium, blowing down, in summer.
  
  
• Close it up: Close shades and drapes during the day to help keep heat out in summer.
  
  
• Clean it up: Remove and clean the AC air filter monthly.
  
  
• Seal it up: Keep "fresh air" vents closed on window AC units.

When your air-conditioning unit is snug in its window, don't neglect the other places in your home where cold air could escape. Use caulk to seal other windows and doors.

For more energy-saving tips from NYSERDA, click here http://www.getenergysmart.org/Resources/Tips.aspx