In many southern states, it’s common for an HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. contractor to install an air handler and ductwork in a vented unconditioned attic. In July, the attic temperature rises to 120°F. Perhaps the homeowner, irritated by his hot bedroom and concerned about his high electricity bills, sticks his head through the attic access hatch, and nearly faints. It’s a sauna up there.
Trade groups representing plastic recyclers in Europe and the U.S. are working together on a common definition of the word "recyclable" in an effort to reduce confusion in the marketplace.
By ANTHONY J. MARCHESE and DAN ZIMMERLE
By JAMES A. HOLTKAMP
Two congressional committees ledLight-emitting diode. Illumination technology that produces light by running electrical current through a semiconductor diode. LED lamps are much longer lasting and much more energy efficient than incandescent lamps; unlike fluorescent lamps, LED lamps do not contain mercury and can be readily dimmed. by prominent Republicans are looking into whether some U.S. environmental groups are acting on behalf of foreign countries.
As an environmental lawyer and professor with ample international experience, this probe troubles me. I’m concerned that these efforts may mark the start of an attack on free speech that discourages efforts to improve American environmental policies.
By SHELLEY POTICHA
By LAURIE GUEVARA-STONE
and CHRISTOPHER BURGESS
California has successfully reduced carbon emissions to 1990 levels, beating its goal by four years.
The Sacramento Bee reported that according to the California Air Resources Board, emissions dropped to 429 metric tons in 2016, a decline of 12 million tons from a year earlier and enough of a decline to meet the state's climate change objectives.
The dew point is a temperature. In my article on the psychrometric chart, I defined dew point as “the temperature at which moisture in the air begins to condense on hard surfaces.” Dew point can be measured or calculated for a specific point in time at a particular location, indoors or outdoors. No matter where it’s measured, the dew point is always less than the air temperature.
Here are a few other definitions for “dew point”:
Colorado is expanding its energy assistance efforts to make solar electricity available to more low-income households. The state is using a systematic approach that experts say could be a "clear roadmap" for other states.
By ROBERT BRULLE
Here we are in the middle of air conditioning season. So why don't we chop down some myths and misconceptions about ceiling fans?
What got me on to this topic was a video of a fan with blades that hide on top of the fan when the fan is turned off. Sounds clever, but it's a ridiculous idea.
Anyway, here are seven things about ceiling fans that a lot of people seem not to know.
Researchers earlier this year said were surprised to find atmospheric levels of a banned blowing agent used in the production of spray polyurethane foam were much higher than expected. All they could deduce was the source was somewhere in East Asia.
Editor's note: This is one in a series of blogs detailing the construction of a net-zero energyProducing as much energy on an annual basis as one consumes on site, usually with renewable energy sources such as photovoltaics or small-scale wind turbines. house in Point Roberts, Washington, by an owner/builder with relatively little building experience. You'll find Matt Bath's full blog, Saving Sustainably, here. If you want to follow project costs, you can keep an eye on a budget worksheet here.
Steve Mackay is already committed to radiant floor heat in the house he is building. Why not, he wonders, use the same system for cooling?
Mitsubishi and Fujitsu sell air-source heat pumps (ductless minisplits and ducted minisplits) that work well in cold climates. Many GBAGreenBuildingAdvisor.com readers report that these appliances are providing dependable space heating in climates as cold as Minnesota, Vermont, Maine, and Quebec, where temperatures drop to -20°F or colder.
Traditionally, U.S. manufacturers of air-source heat pumps have favored ducted units over ductless units. Most air-source heat pumps sold by Bryant, Carrier, Lennox, and Trane, for example, are designed to be hooked up to forced-air ductwork, just like a typical furnace.
The amount of methane leaking into the atmosphere from gas and oil operations in the U.S. is far higher than official government estimates, putting at risk the environmental advantages of burning natural gas over coal to make electricity.
A study published in the journal Science last month reports that emissions of the powerful greenhouse gas are roughly 60% greater than what the Environmental Protection Agency thinks they are.
By SHERRI BILLIMORIA, LEIA GUCCIONE,
and MIKE HENCHEN
By ALISA PETERSEN
The U.S. Green Building Council has named a high-performance house in a Decatur, Georgia, historic district as its 2017 Outstanding Single-Family Project.
The house will be familiar to Green Building Advisor readers. Carl Seville, who built and owns the 2,646-square-foot, two-story home, is a longtime GBAGreenBuildingAdvisor.com author who detailed the ups and downs of this home's construction in a series of posts beginning in 2016.
By CHRIS SELLERS, LINDSEY DILLON and PHIL BROWN