DURATION PREMIUM COOL SHINGLES MANUFACTURER: OWENS CORNING
S
everal studies have documented the potential energy savings from us- ing reflective roofing materials in hot climates. The concept is not new. In fact, the Florida Solar Energy Center notes that prior to the introduction of energy-guzzling air-conditioning in Florida, white roofs were considered essential to beating the heat. The FSEC looked at national data on various types of reflective roofing and found that “the percentage annual cooling savings varied from 13% (new construction in St. Louis) to 58% (existing construction in Los Angeles). The percentage by which heating requirements were increased in existing housing by reflective roofing varied from 3% in Miami to 6% in San Francisco.” New reflective shingles such as this line from Owens Corning represent an affordable upgrade for most contractors. The shingles achieve an initial solar reflectance of .25, and meet the Energy Star requirements for the American
Reflectance Solar Reflectance Thermal
Thermal Mass
Transpiration Convection
Reinvestment Recovery Act. http://
roofing.owenscorning.com/homeowner/ shingles/
duration-premium-cool.aspx
Resistance
Thermal
Roof Cooling Principles
VOLTEX HYBRID ELECTRIC WATER HEATER MANUFACTURER: A.O. SMITH
T
his water heater from A.O. Smith borrows heat from ambient air near the unit, and trans- fers it, heating the water. As a side benefit, it dehumidifies and cools air in the vicinity— making it a good choice for installations in a finished basement. Operation of the heater is,
depending on the season and the application. It has a special “high efficiency” heat pump mode, along with the normal hybrid mode. It can also operate as a no-frills electric water heater. The company estimates that for a four-person household, a Vortex operated in heat pump mode can save $525 annually over a typical 50-gallon electric water heater. That’s a fast payback.
The heater is also Energy Star qualified, so it qualifies for the ARRA credit of up to $1,500. www.
hotwater.com/newproducts/index.html
Appliances Other Electronics Lighting Water Heater Cooling Heating
36
GreenBuilder September 2010
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