According to the study, the positioning of the tree is key to the amount of energy savings. The results of the study show that:
- Trees planted within 40 feet of the south side or within 60 feet of the west side of the house can save you up to 30% on your cooling costs.
- Tree cover on the east side of a house has no effect on heating or cooling costs.
- A tree planted on the west side of a house can reduce net carbon emissions by reducing summertime A/C use by 30% per year.
We typically tell customers to use heavy curtains to control heat gain (close curtains in summer, open in winter). Many trees shed their leaves in winter, allowing sunlight into the home, and their leaves block the sun in the spring/summer/fall to keep heat gain out. This means you can plant a tree instead of buying heavy curtains to achieve similar results.
Thus, properly placed trees can improve air quality by not only by sequestering CO2 as they grow, but also by reducing demand for electricity that is typically from carbon-producing sources.
“For each degree you raise your thermostat in the summer, you will save 3.3 percent on your power bill,” explained Professor David Laband in a separate study that showed a household’s electricity usage could be reduced by slightly over 10% from trees that provide a house with around 20% heavy shade coverage compared to those with no shade at all.
With all of these benefits in mind it should come as no surprise that the State of Maryland has set up a program to plant 1 million trees by 2011. A key part of this program includes incentives that promote community and individual involvement, including a $25 discount for every tree you buy. Montgomery County also offers a $25 discount on every tree purchased. Go to http://trees.maryland.gov and http://www.montgomeryplanning.org/Leaves/ to get your $25 coupons. With all these incentives, and spring well under way, there is no time like the present to start planting trees and save some real green.
For more information check out:
http://trees.maryland.gov/
http://www.montgomeryplanning.org/environment/forest/
http://www.montgomeryplanning.org/Leaves/
http://www.dnr.state.md.us/forests/
http://www.newglarusvillage.com/LW/Attachments/Tree_Facts.pdf
http://www.greenbuilder.com/sourcebook/LandscapingEnergy.html
http://www.springerlink.com/index/MPXK119Y7KK9GP7T.pdf
http://www.physorg.com/news160838589.html
http://www.physorg.com/news150384050.html
http://www.physorg.com/news145939611.html
http://www.livescience.com/environment/090105-shade-trees.html