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That's not a bad idea: The government estimates that the energy Americans use just to run their homes makes up 21% of total energy use throughout the country. And that statistic doesn't even touch on the other environmental issues that can be addressed in a home, including water conservation and indoor air quality.

In an effort to make homes friendlier to the environment and cleaner to the people who live in them, manufacturers have been busy refining their home products. At the recent International Builders' Show, green products -- from paint to appliances -- were everywhere.

"When you go shopping now, it's not even a buzzword anymore -- it's expected," said Calli Schmidt, a spokeswoman for the National Association of Home Builders, referring to the "green" labeling of products. The NAHB sponsors the show.

Despite the many substantial investments that can make a home greener, smaller incremental changes often do count, Schmidt said.

For example, the federal Energy Star program claims that the country would save $600 million in energy costs annually -- or enough to light 3 million homes for a year -- if every household in the United States changed one light bulb to an Energy Star compact fluorescent light bulb. Properly insulating a home is another way to increase its energy efficiency.

But those interested in doing more might consider upgrading their homes with these five products. Some are new and some are just beginning to gain in popularity:

The newest washers are front loading, with features that use less water to clean clothes. Whirlpool, for example, has a washer that uses steam technology to save 73% of the water and 77% of the energy that top-load washers manufactured only four years ago use. A spin speed cycle is able to extract more water from clothes, cutting down on dryer time.

Dishwashers are benefiting from steam technology too. The KitchenAid Steam Option dishwasher saves about 2,400 gallons of water over the life of the appliance.

In many homes, toilets are the biggest water users. To save water in the bathroom, manufactures are developing toilets that use less per flush. Some models take it a step further, using different amounts of water depending on the type of waste being flushed.

Kohler has a Dual Force model under its Sterling brand that has two buttons on its tank: One allows 1.6 gallons for a "bulk" flush and another allows 0.8 gallons for "light waste" and liquid. Other single-flush toilets manage to use 20% less water than a traditional toilet, said Rob Zimmerman, senior staff engineer of water conservation initiatives at Kohler.

Paints have traditionally had some amount of volatile organic compounds present in them. Today's paints often have low amounts of the gasses that hurt a home's indoor air quality. A new product introduced at the show contains no VOCs at all.

The Freshaire Choice line of paints is being offered at Home Depot stores. It claims to have no VOCs in the base or the tint, and the paint comes in recycled packaging.

Generally, there has been an increasing awareness that poor indoor air quality can affect a family's health, said Deborah Jones Barrow, founder of TheDailyGreen.com, a Web site that offers suggestions for green living. "There is a lot of emphasis on increasing the health of the home environment," she said.

Programmable thermostats are often touted as a way to keep energy costs down. The only problem is, many times consumers use them incorrectly.

But online computer programs -- such as a new system from In2 Networks that works with Honeywell thermostats -- allow consumers to monitor heating and cooling consumption and control settings from their computers. The system can show homeowners the difference a couple of degrees could make, both in terms of dollars and the home's carbon footprint.

Low-flow faucets and showerheads may not be a new concept, but the latest versions perform a lot better than their older counterparts. As a result, homeowners who didn't want to sacrifice their hand washing or shower experiences for water conservation are giving these products a second look.

Delta, for example, has a Water-Efficient Showerhead with H20kinetic Technology, a product that creates larger water droplets and provides a more drenching spray, said Betty Hughes, a spokeswoman for the company.