Eco-friendly apartment renters weary of high utility bills can take simple measures to reduce the costs of heating and electricity.

Although the landlord is ultimately responsible for a building's energy efficiency, renters can make dozens of energy decisions every day, said the U.S. Department of Energy on its Web site, www.energy.gov.

To conserve energy, renters should turn off lights and computers when not in use and replace incandescent light bulbs with compact fluorescent bulbs.

Here are some other tips from the DOE to save energy and reduce heating and cooling costs:

• Windows are the biggest source of heat loss in a residence. Caulk and weatherstrip windows and exterior doors. For older leaky windows, put a sheet of plastic over the window and affix with two-way tape.

• Renters who have storm windows should remember to close them during winter. The layer of air between the windows acts as insulation and helps keep heat inside.

• Curtains, window shades and blinds can reduce heat loss in the winter and heat gain in the summer. Consider thick draperies or buy energy-efficient shades with high-reflectivity film. Keep drapes and blinds open during the winter to let sunlight warm the room. Keep window treatments closed during summer days to prevent heat gain.

• Renters who pay for their heat and air-conditioning can save on bills by monitoring room temperature levels. For each degree lower (or higher) you set the thermostat, you can save 2 to 10 percent on heating or cooling costs. During the winter, use the timers to keep the thermostat at 68 degrees during the day and 55 degrees at night. If it seems too chilly, put on a sweater or wear warm layered clothing.

• Clean filters on heating and air-conditioning systems can keep the systems working efficiently. Change filters regularly.

• Refrigerators are energy guzzlers. Set the fridge at 37 degrees and the freezer at 0 degrees. Clean the coils on the back. This will keep the fridge running with energy efficiency.

• If you have your own water heater in your apartment, lower the temperature to 122 degrees. Wash clothes in cold water.

• Temperature variations near the thermostat will affect the whole house. Be sure your thermostat is in an area that is not too cold or hot. If it's in the wrong place, ask the landlord to move it.

• Repair all cracks and holes, large or small, in the walls, doors and windows.

• Move furniture away from exterior walls. Putting space between you and the cold walls makes the house seem warmer. Leaving space for the air to move around actually makes it warmer.

• Dust tends to build up on radiators and baseboard heat vents and keeps the heat from getting into the rooms where you need it. Dust or vacuum all radiator surfaces frequently.

• An electric blanket is much less expensive than heating your bedroom.

• Check efficiency ratings before purchasing appliances.