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Smart Heating Options : Stay Warm and $ave

Posted on 02 January 2012 by Jason

The latest edition of the Consumer Guide to Home Energy Savings reports that heating costs represent the largest residential energy expense—35 to 50 percent—of annual energy bills. Fortunately, homeowners have many fuel- and money-saving options superior to turning up the thermostat on an inefficient gas- or oil-fueled furnace or boiler, using an electric space heater or throwing more logs in the old fireplace.

Before buying any major home heating equipment, it makes sense to first fix leaks. Beef up insulation; seal places where heat typically escapes—around windows and doors, dryer vents and cable and phone lines—and make sure heating ducts and pipes are working properly. Good ventilation is also vital in an air-sealed home, both to control moisture and prevent build-up of indoor pollutants.

Once the home is sealed against unwanted heat loss and maintains regular circulation of fresh air, take bigger energy savings steps. Here are five options to consider, based on local climate, home size and budget.

Air-source heat pump: Because above ground heat pumps transfer heat—from inside to outside or vice versa—rather than create it like a conventional heating and air-conditioning unit, they can provide up to four times the amount of energy they consume, according to the U.S. Department of Energy (DOE). They also help dehumidify indoor air, reducing the need for air conditioning in warm months.

The DOE notes that such devices can cut energy use by 30 to 40 percent in homes that use electric heat in moderate climates. However, they are not a good option for cold climates, where the amount of heat easily drawn from the outdoors is greatly diminished.

Geothermal heat pump: Geothermal or ground-source heat pumps involve loops of pipe buried in four-foot-deep horizontal or 200-foot-deep vertical holes in the yard. They exchange a home’s hot and cold air underground, where the temperature remains relatively stable year-round (between 45 and 75 degrees Fahrenheit). Geothermal heat pumps are three times as efficient as a typical furnace; even the excess, known as “super heat,” can be captured to heat household water. Estimated payback on a geothermal unit is two to 10 years.

Solar heat: Solar heat is either active—capturing the sun’s heat by means of solar collectors—or passive—captured via a home feature such as a sunroom with a south-facing wall that vents warm air into the home. For an existing home, an appropriately designed shed or garage can be well suited for a solar collector; otherwise, a shade-free roof space is often the best option. An active solar-heating system can be air-based or water-based; the latter requires installation of a water storage tank, either in an insulated box outside or beside an existing indoor water tank.

The DOE advises that the most economic designs use an active solar heating system to supply 40 to 80 percent of a home’s heating needs. By combining such a system with passive solar design features—such as thermal walls and tile floors—families may need very little supplemental heat other than solar.

Wood stoves, pellet stoves and inserts: Traditional fireplaces look cozy, but they can send as much as 300 cubic feet per minute of a home’s precious heated air straight up the chimney. Woodstoves, meanwhile, have come a long way, environmentally speaking. Whether old-fashioned or modern in appearance, a contemporary woodstove can serve as an efficient space heater.

The material matters: Steel heats up and cools down quickly; soapstone continues to radiate heat long after the fire is out; and cast iron falls somewhere in the middle. Pellet stoves burn rabbit-feed-like pellets of sawdust, wood chips, crop waste and other organic materials.

The DOE considers pellet stoves the cleanest solid fuel-burning residential heating appliances, so efficient (78 to 85 percent) that the U.S. Environmental Protection Agency exempts them from smoke testing. Pellet stoves can be freestanding, or pellet stove inserts can be fitted to an existing fireplace. With airtight doors, temperature controls and easy loading and cleaning capabilities, fireplace inserts readily turn an energy-wasting fireplace into an efficient home-heating machine.

Radiant Heat: Radiated heat—distributed through a home’s floors, walls or ceiling panels, as opposed to baseboard panels, steam radiators or forced air systems—is more efficient, doesn’t aggravate allergies, and can complement a variety of heating systems, including gas- or oil-powered boilers and solar water heaters if it’s a hydronic (liquid) model. With hydronic radiant floors, the most efficient and popular method, heated water flows from the boiler to specialized underlying tubing that is either embedded in concrete or seated between layers of subfloor.

One downside: a radiant floor can’t be covered with carpet. But with all that toastiness under our toes, why would anyone want to?

Brita Belli is the editor of E-The Environmental Magazine and the author of The Complete Idiot’s Guide to Renewable Energy for Your Home.


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