New Ways to Use Less Energy at Home
Concrete countertops? Blown fiberglass insulation? The payback may be quicker than you think.
By JIM CARLTON
For new-home buyers, green is the color of money.
The share of homes being built in the U.S. with environmentally friendly features jumped to 16% of
single-family starts last year from 2% in 2006, says McGraw-Hill Construction, a market-research firm in
New York. Fueling the trend, industry officials say, is a desire to save energy at a time of high fuel costs.
Indeed, in a recent survey, 93% of builders named increased energy efficiency as an important green
practice—far more than cited any other benefit.
"People understand energy efficiency because it's easy to measure," says Michele Russo, director of
green content at McGraw-Hill, a unit of McGraw-Hill Cos. "They get that bill all the time."
Green homes generally cost anywhere from 2% to 10% more than a typical home, depending on the
features included, though the difference is shrinking. About 4%, or $14,000, of the cost of a $398,000
home purchased last year by Keith and Rebecca Sorensen was for green features, including a solar water
heater and added insulation, says Michael Chandler, who built the three-bedroom residence in Chapel
Hill, N.C. But the couple says their energy bill has been cut by two-thirds from their previous home. The
roughly $200 a month in savings means the Sorensens' green premium will be paid off in about six years.
"We're kind of tree-huggers, if you want to call us that, but I hate spending a lot of money hurting the
environment," says Mr. Sorensen, 38, an accountant.
Many of the latest practices in green building revolve around ways to make homes use less energy.
Here's a look at some recent innovations.
Blown Fiberglass Insulation
Blowing fiberglass between walls, rather than installing matted sheets, is a relatively new technique for
addressing one of the best ways to improve the efficiency of a home: making sure it's properly insulated.
Johns Manville
Blown fiberglass insulation is more effective than traditional batts
"After all, it doesn't make any sense to outfit a home with all of these great new, highly efficient
technologies and then have it in a home that leaks like a sieve," says Michelle Desiderio, director of the
green buildings program at the NAHB Research Center, part of the National Association of Home
Builders, in Upper Marlboro, Md.
The old standard in walls was fiberglass sheets, or "batts," but they often didn't keep rooms sealed very
tightly. That led to a slew of competing products in recent years, such as cellulose, or recycled paper,
and polyurethane spray foam, which provide more insulation because they are blown in to fill all the
nooks and crannies between walls, Ms. Desiderio says.
The fiberglass industry has fought back with new products that have insulation values rivaling cellulose
and spray foam, without the potentially harmful chemicals they may contain. (Officials of those latter
two industries say that toxicity is an issue only when the materials are being installed, and that workers
are instructed to wear appropriate safety equipment to avoid exposure.) One technique has been to
design a system of blowing fiberglass into wall cavities, such as the JM Spider Custom Insulation System
from Denver-based Johns-Manville Corp.
Builders who have switched back to fiberglass say that while the blowing technique costs as much as
40% more than using the batts, it's up to 50% cheaper than using spray foam. Cellulose costs about the
same as blown-in fiberglass, but unlike the Spider fiberglass it can hold moisture, says Stephen Crouch, a
residential market manager for Johns-Manville.
Green-building experts say the higher insulation costs will eventually be offset by the home's overall
energy savings, which can vary widely depending on what other green features are included.
Mr. Crouch says Johns-Manville's Spider sales have continued to increase during the housing slowdown.
Cellulose and spray foam have both continued to gain share in the home insulation market, say officials
of the two industries. And cellulose has "superior" moisture-handling capabilities, says Daniel Lea,
executive director of the Cellulose Insulation Manufacturers Association, in Dayton, Ohio. Mr. Lea adds
that cellulose is the "greenest of green" insulation, in part because it has such a high content of recycled
materials including newspapers.
Spray foam, meanwhile, has added benefits such as being able to reinforce the structural integrity of a
house, says Kurt Riesenberg, executive director of the Spray Polyurethane Foam Alliance in Fairfax, Va.
Heat Pump Water Heaters
Heat pump water heaters have hit the residential market over the past two years as a way to slash bills
on electric water heating. Made by companies including General Electric Co. and Rheem Manufacturing
Co., the water heaters suck heat out of the air such as in a garage or basement, like a refrigerator
running in reverse, and use it to help heat water in a house.
The savings can be significant: In the case of the Rheem HP-50 heat pump water heater, Rheem officials
say the average annual operating cost of the device is between $225 and $280, or about half that of
standard electric water heaters.
But the heaters aren't cheap. They cost up to $1,500 for a 50-gallon model, or three times as much as a
comparable conventional electric water heater and five times as much as natural-gas-powered units
(though natural gas isn't available everywhere). To pay back the higher investment would take three to
four years, based on the annual savings.
Another issue with the heat pump units is that homeowners could inadvertently end up paying more to
heat the home if one is installed in the wrong place. "If you put it in the garage, that's OK, but if you put
one in your basement, that will pull heat out of the basement—forcing you to put more heat back in,"
says Joe Wiehgen, a senior research engineer at the NAHB Research Center. He suggested that wouldn't
be as much of an issue in more temperate climes.
Electronic Monitoring
Several companies have come out with home monitoring systems over the past year that let
homeowners track their energy use so they can turn off electricity where it isn't needed.
In February, France's Schneider Electric SA introduced the Wiser Energy Management System, which lets
homeowners see a computerized display of their power consumption so they can make adjustments,
such as shutting down power to unused appliances. Costing about $600 with installation, the Wiser
system can take $60, or 20%, off a $300-a-month power bill, meaning a payback period of as little as a
year, says Jeff Drees, president of Schneider's U.S. division.
Similarly, Newton, Mass.-based Powerhouse Dynamics Inc. last year introduced the eMonitor, which
costs about the same and advertises a comparable payback period. At the Sorensen residence in North
Carolina, the builder, Mr. Chandler, says he included an eMonitor system in the home and has agreed to
monitor power use for the family.
"It shows you in a graphical format where there are spikes and stuff," says Mr. Sorensen, who shares the
home with his wife and their three children.
Concrete Countertops
At least one green building technology costs less right out of the gate: concrete countertops.
Inspired by "Concrete Countertops: Design, Forms and Finishes for the New Kitchen and Bath," a book
by designer Fu-Tung Cheng of Berkeley, Calif., builders around the U.S. have taken to making
countertops by mixing their own concrete on a home site. The technique is considered both greener and
cheaper because the concrete doesn't have to be shipped like the more prevalent granite counters, says
Mr. Chandler, who began building them last year.
According to online calculators, it costs around $1,100 to make 50 square feet of concrete countertop,
compared with $2,000 for granite.
But the do-it-yourself approach has its drawbacks. "The challenge is getting the right training for your
crew," Mr. Chandler says. "You have to know how to reinforce steel in the right way. It's not intuitive."
Mr. Carlton is a staff reporter in The Wall Street Journal's San Francisco bureau. He can be reached at
jim.carlton@wsj.com.