s
SHARE

Degree Days Shuffle

Posted by Jim Gunshinan on December 12, 2017
Degree Days Shuffle UC Berkeley campus on a summer day.

A 2015 study, “Impacts of global warming on residential heating and cooling degree-days in the United States,” comparing heating degree-days (HDD), cooling degree-days (CDD), and HDD + CDD across the United States during the historical period 1981–2010 and the future period 2080–2099 predicts that New York City weather will become more like today’s Oklahoma City weather and Seattle’s will become more like present day San Jose’s weather. In general, there will be a significant decrease in HDD days in the North and a significant increase in CDD in the North and South.

The authors, Yana Petri and Ken Caldeira, use a “business as usual” climate model to predict changes in both HDD and CDD in regions across the United States and in particular, for 25 U.S. cities. Among their findings: San Francisco will be the city with the lowest number of HDD + CDD—a measure of heating and cooling energy use—with 2,634 combined degree-days. Minneapolis will be one of the highest in terms of combined HDD and CDD, with 7,174. Interestingly, for San Francisco, that represents a few hundred degree-days less than today and for Minneapolis, more than a thousand less.

On a national scale, the U.S. Climate Change Science Program looked at about 20 studies of climate change since 1990. They predict a 9.2% energy reduction for heating and a 5–20% increase for cooling per 1 °C of temperature change. In the worst-case scenario, worldwide average temperatures will increase by nearly 5 0C. The result? Some heating dominated areas will become cooling dominated. In general, that means less natural gas and fuel oil used and a lot more electricity used for cooling.

Comments
Add a new blog comment!

Enter your comments in the box below:

(Please note that all blog entries and comments are subject to review prior to posting.)

 

While we will do our best to monitor all comments and blog posts for accuracy and relevancy, Home Energy is not responsible for content posted by our readers or third parties. Home Energy reserves the right to edit or remove comments or blog posts that do not meet our community guidelines.

Recent Blogs
Degree Days Shuffle

Degree Days Shuffle

Jim Gunshinan

A 2015 study, “Impacts of global warming on residential heating and cooling degree-days in the United States,” comparing heating degree-days (HDD), cooling degree-days (CDD), and HDD + CDD across the United States during the historical period 1981–2010 and the future period 2080–2099 predicts that New York City weather will become more like today’s Oklahoma City weather and Seattle’s will become more like present day San Jose’s weather. In general, ... [continue reading]

Cool—and Warm—Clothing

Cool—and Warm—Clothing

Jim Gunshinan

“Why do you need to cool and heat the whole building? Why don’t you cool and heat individual people?” asked Yi Cui, professor of materials science and engineering at Stanford University. [continue reading]

Smarter Homebuilding: How to Best Incorporate Smart Tech Features

Smarter Homebuilding: How to Best Incorporate Smart Tech Features

Eric Murrell

The old way of integrating technology into a home could be a major headache. If a client doesn’t know exactly what kind of tech they want early in the building process, they could later face the agony of tearing into drywall or missing out on certain features altogether. Speakers and security products required hard wiring, advanced lighting systems required an electrician, and something as simple as installing outdoor security cameras presented its own ... [continue reading]

Building Science Can be Fun

Building Science Can be Fun

Jim Gunshinan

We've come a long way in understanding and providing homeowners with the means to create healthy indoor air. But comfort is a separate matter from good IAQ. Ian Walker and Robert Bean, building scientists from the United States and Candid respectively, and both experts on ventilation, discuss this and much more in an entertaining yet very interesting and informative video produced by Debra Little.  [continue reading]

People Who Save Energy

People Who Save Energy

Jim Gunshinan

According to the American Council for an Energy Efficient Economy (ACEEE), there are millions of workers in the country creating homes that are more energy efficient, and safer and more comfortable to live in. In fact, the Department of Energy puts that number at more than 2-million people working for energy efficiency in the United States. Compare that to the 1.9 million workers producing electricity, coal, natural gas, and gasoline. And the number working for energy ... [continue reading]

Coping with Dust and Smoke From Fires

Coping with Dust and Smoke From Fires

Alex Stadtner

October will long be remembered in Northern California, where wildfires destroyed over 8,000 structures, killed scores, and forever changed Sonoma and Napa counties. Survivors face new threats and hazards seldom addressed in design-build magazines and chat rooms. [continue reading]

Integrating Building Performance with Design

Integrating Building Performance with Design

Elizabeth Grant

Now, more than ever, it is important for design professionals to be advocates of environmentally responsible design. Architects should aim to create places that occupants care about and care for, and maintain and enjoy for a long time. Unfortunately, architects may not have adequate training or experience to handle performance mandates relating to building integrity and comfort. This can result in situations where these parameters are either inadequately addressed, or are relegated to consulting engineers ... [continue reading]

New Home Builders Tackle Zero-Energy Home Building in Connecticut

New Home Builders Tackle Zero-Energy Home Building in Connecticut

Amber Schilberg

Connecticut’s 2016 Zero Energy Challenge reinforces the growing interest in the zero-energy home building movement. In addition to increased participation among experienced homebuilders, the 2016 challenge had an influx of inexperienced zero-energy home builders trying their hand at zero-energy homebuilding for the first time, with two winning. [continue reading]

Housing Innovation Awards Wrap-Up

Housing Innovation Awards Wrap-Up

Stacy Hunt

Earlier this month at the EEBA High Performance Home Summit, the DOE Zero Energy Ready Home program had the pleasure of honoring 24 of the nation’s leading builders with the 2017 Housing Innovation Awards. These awards not only recognize these builders for their incredible homes, but also their leadership. “Housing Innovation Award winners are leading a national movement to Zero Energy Ready Homes, providing better places for Americans to live, stronger communities, and a ... [continue reading]

Energy Data Gains Traction in Real Estate Listings

Energy Data Gains Traction in Real Estate Listings

Ryan Meres

For more than a decade studies have consistently shown that homebuyers want energy efficient features, but few are actually aware of the impact those features have on energy cost. The average U.S. homeowner spends more on energy than property taxes and insurance, but energy is the only one of those three common expenses not considered in the mortgage process. The recent announcement and report released by the Rocky Mountain Institute (RMI) that real estate ... [continue reading]

Earn BPI CEU credits
HEP
Home Performance with EnergyStar

Harness the power of
HOME PERFORMANCE!

Get the Home Energy
e-newsletter

FREE!

SUBSCRIBE

NOW!