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Check your window caulk. Is it broken or missing?
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Do all your windows that receive direct sunlight have shades to keep heat out during the air conditioning months?
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Is your hot water heater set at the optimal temperature? If you can live with really warm water instead of scalding water you can save a lot of energy.
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Check the weather stripping on all your exterior doors or doors that separate climate controlled spaces from non-climate controlled spaces like an attic. Is the weather stripping in good condition? Are there any gaps. If so, replace the material quickly.
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If your home's central air/central heat unit is more than 10 years old and hasn't been serviced in a while, have a company test it for its efficiency. Keep in mind, this company might try to sell you a new unit. If they say you need a new one, get a second opinion first.
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If you use your air conditioner a lot, are there any places you can add ceiling fans?
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Check the exterior of your house. Would an awning protect a big window from the sun? Would more tree cover help keep the house cool? If landscaping is in your plans, keep these things in mind.
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Monitor yours and your family's use of energy for a few days. Is everybody turning off lights and fans and computers when not in use?
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Check the exposed insulation in attics, basements and crawlspaces. Are there any gaps?
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Some energy companies will do a free home energy audit if you ask them. This is a good way to get knowledgeable information from folks who aren't trying to sell you something. Sometimes it doesn't make sense to make an expensive repair to save a little money on energy. But if you find such a situation, then it makes even more sense to make the inexpensive repairs.
