Energy Efficiency
Energy efficiency involves a set of strategies that can be used to reduce the consumption of energy—especially fossil-fuel energy—in buildings. These strategies include:
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monitoring energy use
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improving building commissioning
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applying insights from building science
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selecting innovative HVAC and building envelope technology
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using natural ventilation and daylighting to provide low-cost alternatives to standard systems
Energy Efficiency
Deep Dives
Get up to speed on complex topics. You can also earn CEUs and download PDF Spotlight Reports.
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The Challenge of Existing Homes: Retrofitting for Dramatic Energy Savings
Feature
Greenhouse gas emissions associated with residential energy use account for a fifth of all emissions in the U.S. Retrofitting existing houses to achieve a two- to three-fold reduction in energy use is necessary if we are to achieve the emissions reductions scientists say are required for avoiding catastrophic climate change. Here's a look at how it can be done.
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Counting Carbon: Understanding Carbon Footprints of Buildings
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Everyone seems to be talking about measuring carbon footprints and designing carbon-neutral buildings, but these terms mean different things to different people. Some focus just on operating energy, while others also look at transportation, materials, and other building-related emissions. As with so many things, the results depend on what you count and how you count it.
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Energy Dashboards: Using Real-Time Feedback to Influence Behavior
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Real-time feedback on energy use can change occupant behavior and save energy. Several products now on the market provide this feedback in varying degrees of complexity.
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Commercial Kitchens: Cooking Up Green Opportunities
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Commercial kitchens run energy- and water-intensive equipment for long hours, sometimes even when not in use. While the challenges of saving water and energy in commercial kitchens are daunting, they're not insurmountable. Careful equipment selection and a commitment to conscientious kitchen practices can dramatically cut down on waste-and utility bills.
Quick Takes
Jump straight to the essentials with these short explanations of green building concepts.
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Thermal Mass: What It Is and When It Improves Comfort
Explainer
Heavy or massive objects like masonry can help improve thermal comfort, if used properly. They often don't insulate well, however.
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How Active Dehumidification Works
Explainer
Whether you choose a refrigerant-based or a desiccant-based system, dehumidifiers use energy and produce waste heat.
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Comparing Fuel Costs
Explainer
One would think comparing the costs of different heating fuels would be simple, but figuring out the amount heat available in a given quantity of fuel-and the associated cost-can be tricky.
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Post-Occupancy Evaluations: Ignorance Isn't Bliss
Explainer
POEs tell you everything you ever wanted to know about your buildings. Don't be afraid to ask.
Product Guidance
Unbiased information from our product experts helps you separate green from greenwash.
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High-Efficiency Refrigerators and Freezers from SunDanzer
Product Review
SunDanzer offers small, DC-powered, highly insulated refrigerators and freezers.
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Colt's Faade Shading with Passive Control
Product Review
Colt International's Solarfin shading louvers with Girasol controller adjust automatically in response to solar exposure.
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Phoenix Solar Tank Does it All-Efficiently
Product Review
The Phoenix Solar hot water tank stores both primary solar-heated and secondary gas-heated water.
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An Affordable Heat-Pump Water-Heater Retrofit
Product Review
AirTap is an affordable heat-pump module that can be retrofit onto a conventional electric or gas water heater. The unit has a first-hour rating of 42.5 gallons, an efficiency of 240%, and a GAMA-tested energy factor of 2.11.
In The News
We break news down to the essentials and provide expert analysis.
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Obama Pushes Appliance Efficiency
News Analysis
President Obama ordered the U.S. Department of Energy to update federal standards for several residential and commercial appliances by August 2009.
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D.C. Energy Performance Ratings Set National Precedent
News Analysis
Energy waste in Washington D.C.'s public buildings is getting increased scrutiny as performance numbers are released under a new statute.
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A Surge of Popularity for Efficient DC Power
News Analysis
Which is more efficient: alternating or direct current? Experts say DC is the future of power distribution-and they're ready to get started now.
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Report: For Better Buildings, We Need Better Data
News Analysis
With CBECS fading, where can we turn for reliable building performance data?
Perspective
Thought-provoking opinions from the most trusted minds in sustainability.
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Installing Insulation With the X-Floc Ventilated Dry Injection System
Blog Post
X-Floc claims the blowing equipment they use delivers cellulose at a more consistent density, and they were willing to prove it with this demonstration.
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R-10 Vacuum-Insulated Glazing
Blog Post
The technological challenges for high performance, vacuum-insulated glazing may have finally been surpassed, but the results are still under wraps.
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7 Tips to Get More from Mini-Split Heat Pumps in Colder Climates
Blog Post
Air-to-air heat pumps are getting more popular as a primary heat source in colder climates. Here’s how to get the most from your system.
Learning Resources
Syllabus supplements and CEU content, with automatic reporting for AIA and GBCI.
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Just For Fun
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