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LEED for Homes 101: Energy & Atmosphere Credits
Rise's LEED for Homes series attempts to help you understand the best practices of sustainable home building. In effect, we are translating a highly technical reference guide written by a team of experts into something the average homeowner can understand.
So far, we have introduced LEED for Homes 101 and provided an in-depth guide on the first four out of eight LEED categories: Location & Transportation, Sustainable Sites, and Water Efficiency. Last month, we looked at the Prerequisites for Energy & Atmosphere, the LEED rating system's largest point-earning section. But those prerequisites are the bare minimum. Here, we discuss how a home can earn up to 40 out of 100 LEED points in this section alone - implying that energy efficiency might be an essential attribute of a sustainable home.
Table of Contents
What's the LEED for Home's Energy & Atmosphere Goal ?
While the title may sound wonky, the goal is pretty simple: reduce your home's energy usage. Reducing energy needs will not only save you money year after year, but it also reduces your home's carbon footprint.
How Do You Earn Energy and Atmosphere LEED for Homes Points?
There are four parts to earning Energy and Atmosphere LEED for Home Points. They are:
- Annual Energy Usage (up to 36 points)
- Efficient Hot Water Distribution System (1 to 2 points),
- HVAC Start-up Credentialing (1 point), and
- Refrigerant Management (1 point)
What is Annual Energy Usage In LEED for Homes?
The first credit is called "Annual Energy Usage." While the prerequisite states that homes must meet, at a minimum, the requirements of ENERGY STAR for Homes, Version 3, anything beyond the minimum earns points. It all depends on your HERS Index score. The HERS (Home Energy Rating System) was developed by the Residential Energy Services Network (RESNET). Each home receives a score of 0-150 based on its predicted level of energy efficiency. The higher the score, the less efficient the home. The current "built to code" home, which is the basis for comparison, is the home built to the 2006 International Energy Conservation Code, which receives a score of 100. So, if your home's score is 75, it is 25% more efficient than that same home built to code.
How Do You Get a HERS Rating for Your Home?
Of course, unless you're an energy rater yourself, you'll need to find someone to do the energy modeling. The cost of having an energy rater model your own home can vary widely and is typically between $300-$1,500. RESNET offers a handy search tool to find a professional in your area so that you can gather a couple of proposals. HERS is a great tool to understand your home's relative energy efficiency and a starting point down the path of reducing your home's annual energy usage.
What is HVAC Start-up Credentialing?
A home can earn another point by doing something relatively simple: hire a "credentialed" HVAC contractor to make sure that all the home's heating, ventilating, and cooling equipment are operating as they should—ideally, at peak efficiency. A credentialed contractor is trained by the HVAC Quality Installation Training and Oversight Organization (H-QUITO). This credit requires that the contractor utilize the ENERGY STAR for Homes, version 3, HVAC system quality installation contractor checklist. Again—a complicated piece to do on your own. But with a qualified technician, it is a quality control measure that will ensure you save the energy that your systems were designed to save.
What Does Refrigerant Management Mean?
This final credit, worth one point, is intended to reduce ozone depletion. Refrigerants—chemical compounds found in all cooling equipment—are some of the world's worst substances from a global warming potential standpoint. The nonprofit organization Project Drawdown's book, The Most Comprehensive Plan Ever Proposed to Reverse Global Warming, has ranked refrigerant management its number one solution to reduce greenhouse gas emissions in combatting global climate change.
What can a homeowner do? Make sure that all of your cooling equipment uses refrigerants where their global warming potential (GWP) is equal to or less than that of R-410a (an alternate refrigerant). It also needs to have an ozone depletion potential of 0. The list below of complaint refrigerants is current as of 2021.
The Bottom Line
Homes and their energy needs have become quite complicated—from the components that affect their energy usage to all the appliances and devices that utilize power. Becoming aware of these is the first step toward managing and reducing the energy your home consumes. Meeting and exceeding LEED for Homes credits will take you even further. And as you work to reduce it, you'll be saving money and reducing your carbon footprint at the same time.
*Note: Cover image of the LEED Platinum Pappas Residence, courtesy of the USGBC.
Melissa Rappaport Schifman
Melissa became the Twin Cities’ fifth LEED for Homes Accredited Professional (LEED AP) and completed the work necessary to get her own home LEED Gold Certified, the basis for her book, Building a Sustainable Home: Practical Green Design Choices for Your Health, Wealth, and Soul, (Skyhorse Publishing, August, 2018). With her corporate experience in finance, marketing, and business development, and an MBA and Master’s in Public Policy from the University of Chicago, Melissa has been providing sustainability advisory services to businesses, governmental agencies and non-profits, focusing on strategic and operational change that provide bottom-line financial returns. She has led the LEED certification of two million square feet of commercial buildings, written GRI-compliant Corporate Sustainability Reports, is a LEED Pro Reviewer and LEED mentor with the U.S. Green Building Council. She is the founder of Green Intention LLC where she writes about sustainable home living.
