Good morning! As I’m writing this, it’s 9:30 in the morning on a Sunday, and my house is already cooled for the day. I live in the Sacramento are of California, so I enjoy Rome-esque temperatures during the summer. Our dry-hot summers make California perfect for being the agricultural capital of the US: over 75% of crops that feed US families is grown here. We produce tomatoes, avocados, and just 35 minutes south of my house is Lodi. Bring on the wine!
It also means that almost every house built since the ’60s has central air conditioning, and houses built before that are frequently retrofitted with central air and heating units. So, we aren’t really prepared here for when suddenly the AC unit stops working. Two years ago I was pet sitting for two weeks with huskies, and during the first 110 degree heat wave their AC blew. The homeowners were in China, and for the first time in my life I was coordinating overseas to fix an AC unit. I’m glad it happened, because later that summer when the AC stopped working in my house, I knew how to handle it.
Since then, I have managed to figure out some ways to save money during the summer on cooling my house. These things are crucial when you don’t have air conditioning, but they can save the big bucks when you do.
- Purchase fans. At my small two bedroom duplex we have three big fans, one small fan, and one standing air purifier fan. Amazingly, the air purifier, the small fan, and one of the big fans are all in the bedroom. One big fan is in the living room, and the most powerful fan is in the office. Through the use of these three big fans, we get the air circulating throughout the house. Air naturally flows through the Northern Hemisphere in a clockwise direction. If you get the air in your house also flowing in a clockwise direction when the outside temperature is 10 degrees cooler than inside, you will be able to get your house temp to drop a good three degrees in a half hour. Trying to force the air to go counter clockwise… just doesn’t work (unless you’re in the Southern Hemisphere!)
- Timing. Open your house and use your fans at night and in the early mornings. The coolest part of the day is usually at about 4 or 5 a.m., and although most of us won’t bother getting up that early to open the house and get the fans going, purchasing window jamb locks or dowels so you can keep your windows locked open overnight and run your fans will ensure that the house is suitably cooled through the night. Then, a little later in the morning when it starts warming up you can shut everything and close the blinds for the day.
- Keep the sun out. Once things start warming up outside – usually at about 8 or 9 a.m. here we hit 70 degrees – it’s time to shut up the house. Close all the doors and windows, close the blinds, drapes, and blackout curtains. The goal is to keep out as much sun as possible, because with the sun comes the heat. By keeping as much heat out for as long as possible you can keep the AC off for as long as possible.
- Understand peak hours. An additional cost-saving tip is to understand peak hours. No, these are not the best hours to use energy; quite the reverse, actually. These are the times when energy costs are at their peak. Try not to use energy between 2 and 7 p.m. The best times to use energy are between midnight at 5 a.m. Electric companies intentionally raise prices during the times (read as the heat of the day and when they come home from work) when people want to use energy the most. These are the good times to entertain yourself without electronic devices: read a book, cook dinner outside on the grill, and, if it’s cool enough, eat outside, too. By not heating the house or using electronic devices (which also increase the temperature in your house) you can save energy at the time when it costs you the most.
- Fix up your house. Clearly, this only applies if you own your home and have the disposable income to alter your house. But, double-paned windows keep more heat out while still allowing sunlight in. It isn’t a perfect barrier for heat, but the difference is considerable and slows the temperature rise in your house during the day. Also, a whole house fan is a worthwhile investment. You can lock your windows open at night and run the whole house fan, and it will pull the cool are into your house through the windows, up through the attic, and back out. In effect, it can cool the whole house to the outside temperature in an hour or two, and it take a fraction of the energy of the air conditioning unit. Getting proper insulation in your walls also helps keep heat on the proper side of the walls – outside in summer and inside in winter – and plant trees on the South (in the Northern Hemisphere and North in the Southern Hemisphere) and West sides of the property to provide shade during the hottest part of the afternoon. Not only do these changes save you a ton on your energy bill, they also increase the value of your property if you are trying to sell!
- In case you don’t have an air conditioner. If your AC goes out, or if you just don’t have one, there are a few things you can do to cool off. First, you can do as my parents did and purchase a portable air conditioning unit. This requires that you have the correct type of window, and can be more costly as the units themselves can be quite expensive and they still use a lot of energy. But, you can also make your own. Get a powerful floor fan, a bucket, some copper tubing, a water pump, some zip ties, and a water pump that will fit the tubing. Bend the copper tubing into a spiral and use the zip ties to attach it to the front of the fan. Leave a length of tubing free on each end because you need both ends to be able to reach into the bucket. Attach the water pump to one end of the tubing and stick it in the bucket; the other end will pour the water back into the bucket. Then, put a big block of ice into the water and fill the bucket with cool tap water. Turn on the pump and the fan, and once you get freezing cold water moving through the copper tubing the fan will blow the cold into the room. You can get the room a couple degrees cooler at least. If you don’t want to do all that, freezing a case of water bottles in your freezer and then sticking them in front of the fan until they defrost works, too, though not quite as well.
- Run your AC at a higher temperature. Where I live in California, we get a total of about two weeks each year of 110+ degree weather and about a month or two of 110+ degree weather. Most public buildings keep the temperature at 70-74 degrees, but the AC kicks on more frequently and for longer periods with a lower temperature. by keeping the internal temperature of your house set higher – at 78 or 80 degrees, for example – you are able to save a good 25% on your energy bill because the AC doesn’t kick on as often or for as long. Besides, you will adjust to the warmer temperatures eventually. If it really bothers you, spend a few hours outside where it’s hot; the warmer inside temperature will feel great when you come back inside!
- It may be worth it to turn your AC off. Are you at home in the afternoon? Do you have pets? Do you work full time while your kids go to school? If everyone is gone for the same eight hours in the day and there aren’t any pets that need a cooler temperature, then it may be ideal to just turn off the AC until you get home. Think about it: it may cost double to turn on your air conditioning and cool your house, but if no one is home then it may be better to only have to pay for a few hours of cooling versus all day of cooling. However, if someone stays home all day or there are pets, then keeping the thermostat set at the same temperature all day actually saves energy in the long run, especially if you are using fans to cool the house at night.
I hope these tips help you! There’s nothing better than coming into a cool house at the end of a hot day, but that cool house doesn’t have to cost you a fortune.
Stay cool!