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:

  • monitoring energy use

  • improving building commissioning

  • applying insights from building science

  • selecting innovative HVAC and building envelope technology

  • 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.

Quick Takes

Jump straight to the essentials with these short explanations of green building concepts.

Product Guidance

Unbiased information from our product experts helps you separate green from greenwash.

  • New Products from Greenbuild 2023: Part Two

    Product Review

    In part two of our Greenbuild expo product roundup, I’m covering CO2 heat pumps, a ground-source system heat pump system, agricultural fiber panels, construction equipment wash systems, and more.

  • A Standard for Managing Outdoor Lighting’s Negative Impacts

    Product Review

    Design Lights Consortium’s LUNA Standard balances verified energy efficiency and performance data with environmental concerns to help design teams select application-specific lighting.

  • Blanket and Batt Insulation

    Product Guide

    Batts and aerogel blankets with high recycled content, reduced air-quality concerns, or superior performance

  • Blown Insulation

    Product Guide

    Blown-in products with high recycled content, superior energy performance, and low-toxicity ingredients

In The News

We break news down to the essentials and provide expert analysis.


Thought-provoking opinions from the most trusted minds in sustainability.

Learning Resources

Syllabus supplements and CEU content, with automatic reporting for AIA and GBCI.

  • The BuildingGreen Guide to Thermal Insulation

    Special Report

    The BuildingGreen Guide to Thermal Insulation, Fourth Edition, provides detailed guidance on insulation products and practices, including environmental and health comparisons, and recommendations on what insulation to use and what to avoid.

  • We Must Decarbonize Existing Buildings by 2050—but How?

    Feature Article

    Curbing carbon emissions requires that we address our vast stock of existing buildings. Here’s how to make the case and get it done.

  • Is Using Smart Glass Smart?

    Feature Article

    Electrochromic glazing holds the promise of less glare and better energy efficiency with fewer attachments. The reality is much more complicated.

  • Net-Zero Energy Isn’t the Real Goal: 8 Reasons Why

    Feature Article

    Net-zero-energy buildings don’t always reduce carbon emissions. These are the tweaks we need to ensure they do.

Just For Fun

Something weird happens every April at BuildingGreen...