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23 Tips for Keeping the House Cool

23 Tips for Keeping the House Cool

Puzzling out how to keep your house as cool as possible during these hot summer months? Trying to remember the conventional wisdom but not quite sure how it goes? Those window fans, for example, should they be placed to draw air in or out? Upwind or downwind of the dwelling? And what about windows, shades, and awnings? Are windows on the North side of the house better left closed or open during the day? Are awnings better than shades?

Find out the answers to these questions and more, right here:

The recent heat spell on the East Coast dredged these questions up for me, and I am sure these questions are seasonal for many of us. Efficient cooling saves money, energy, and the quality of our lives.

Turning to Consumer Guide to Home Energy Savings by Alex Wilson, Jennifer Thorne, and John Morrill of the American Council for an Energy-Efficient Economy has provided a wealth of answers to just these questions and more. I’ve compiled 23 tricks about how to keep a house cool to reduce the need for air conditioning from this book, as well as a few from The Real Goods Solar Living Sourcebook. These tips are really useful.

1. Reduce the cooling load by employing cost-effective conservation measures. Provide effective shade for east and west windows. When possible, delay heat-generating activities such as dishwashing until evening on hot days.

2. Over most of the cooling season, keep the house closed tight during the day. Don’t let in unwanted heat and humidity. Ventilate at night either naturally or with fans.

3. You can help get rid of unwanted heat through ventilation if the temperature of the incoming air is 77 F or lower. (This strategy works most effectively at night and on cooler days.) Window fans for ventilation are a good option if used properly. They should be located on the downwind side of the house facing out. A window should be open in each room. Interior doors must remain open to allow air flow.

4. Use ceiling fans to increase comfort levels at higher thermostat settings. The standard human comfort range for light clothing in the summer is between 72 F and 78 F. To extend the comfort range to 82 F, you need a breeze of about 2.5 ft/sec or 1.7 mph. A sow-turning ceiling-mounted paddle fan can easily provide this air flow.

5. In hot climates, plant shade trees around the house. Don’t plant trees on the South if you want to benefit from passive solar heating in the winter.

6. If you have an older central air conditioner, consider replacing the outdoor compressor with a modern, high-efficiency unit. Make sure that it is properly matched to the indoor unit.

7. If buying a new air conditioner, be sure that it is properly sized. Get assistance from an energy auditor or air conditioning contractor.

8. Buy a high-efficiency air conditioner: for room air conditioners, the energy efficiency ratio (EER) rating should be above 10; for central air conditioners, look for a seasonal energy efficiency ratio (SEER) rating above 12.

9. In hot, humid climates, make sure that the air conditioner you buy will adequately get rid of high humidity. Models with variable or multi-speed blowers are generally best. Try to keep moisture sources out of the house.

10. Try not to use a dehumidifier at the same time your air conditioner is operating. The dehumidifier will increase the cooling load and force the air conditioner to work harder.

11. Seal all air conditioner ducts, and insulate ducts that run through unheated basements, crawl spaces, and attics.

12. Keep the thermostat set at 78 degrees F or higher if using ceiling fans. Don’t air-condition unused rooms.

13. Maintain your air conditioners properly to maximize efficiency.

Additional tips from the Real Goods Solar Living Sourcebook, edited by Doug Pratt and the Real Goods staff.

Warm Weather Window Solutions

14. Install white window shades or mini-blinds. Mini-blinds can reduce solar heat gain by 40-50 percent.

15. Close south and west-facing curtains during the day for any window that gets direct sunlight. Keep these windows closed, too.

16. Install awnings on south-facing windows, where there’s insufficient roof overhang to provide shade.

17. Hang tightly woven screens or bamboo shades outside the window during the summer to stop 60 to 80 percent of the sun’s heat from getting to the windows.

18. Apply low-e films.

19. Consider exotic infills in your windows, a new technology that fills the space between panes with krypton or argon, gasses that have lower conductivity than air, and which boost R-values.

Tips for your A/C

19. Provide shade for your room A/C, or the outside half of your central A/C if at all possible. This will increase the unit’s efficiency by 5 percent to 10 percent.

20. Clean your A/C’s air filter every month during cooling season. Normal dust build-up can reduce air flow by 1 percent per week.

22. Turn off your A/C when you leave for more than an hour.

23. Several studies have found that most central air conditioning systems are oversized by 50 percent or more.

Read more: Home, Reduce, Recycle & Reuse

Adapted from Consumer Guide to Home Energy Savings, by by Alex Wilson, Jennifer Thorne, and John Morrill. Copyright (c) 2000 by the American Council for an Energy-Efficient Economy . Reprinted by permission of Chelsea Green Publishing Company.
Adapted from Consumer Guide to Home Energy Savings, by Alex Wilson, Jennifer Thorne, and John Morrill.

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Annie B. Bond

Annie is a renowned expert in non-toxic and green living. She was named one of the top 20 environmental leaders by Body and Soul Magazine and "the foremost expert on green living." - Body & Soul Magazine, 2009. Learn Annie's latest eco-friendly news on anniebbond.com, a website dedicated to healthy and green living.

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Consumer's Guide to Home Energy Savings

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99 comments

+ add your own
1:36PM PDT on Apr 2, 2014

In the summer we always shut all of our blinds, it causes the temperature to stay even more cool than if they were open. Sometimes it gets a little dark with the blinds shut so we have to open them to let the light in, but it really does make a difference. My dad always says that we should keep the basement door shut because cool air searches for the lowest places to go.

Luke | http://www.auroramechanical.ca/services.html

1:36PM PDT on Apr 2, 2014

In the summer we always shut all of our blinds, it causes the temperature to stay even more cool than if they were open. Sometimes it gets a little dark with the blinds shut so we have to open them to let the light in, but it really does make a difference. My dad always says that we should keep the basement door shut because cool air searches for the lowest places to go.

Luke | http://www.auroramechanical.ca/services.html

10:00AM PST on Nov 7, 2013

After reading this article I just want to say to everyone to follow this article. We know that in summer we spend more for our electric bill, but there are few ways to save energy bill. First plant trees around our house and take proper care of your air conditioner. Please do not open your windows and doors without any reason. Just follow this and save money.

12:50PM PDT on Jul 11, 2013

This summer has been miserable. I'm living farther south than I'm used to, and the heat is killing me. Just wish I had something other than a floor air conditioner. Cincinnati heat is the worst.http://www.clarkheating-cooling.com

3:36AM PDT on Jul 11, 2013

Thank you :)

12:27AM PDT on May 11, 2013

I will share it more

12:24AM PDT on May 11, 2013

Thank you for sharing.

12:23AM PDT on May 11, 2013

Thank you for sharing.

2:49PM PDT on Apr 4, 2013

Good tips,thanks for sharing

11:55AM PDT on Mar 21, 2013

Thanks for sharing! I've been looking for someone that repairs heating and air conditioning in Fayetteville, NC to fix a few small problems. I think I'll try some of these first before spending money on a professional. Great tips! http://www.capefearair.com/services.php

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