Set Your Thermostat Right to Save Money and Energy

Updated on April 6, 2016

While I have the good fortune of living in Seattle, with a fairly even climate and temperature plus, even when you do need to use the heater in winter, electricity costs little... others are not as fortunate, living in places with bitterly freezing winters, blazing hot summers and expensive electricity: running the air conditioning (A/C) and heater constantly pushes many monthly electric bills into the hundreds of dollars.

I feel your pain. I grew up in Las Vegas, a place where, if you didn't have air conditioning in the dead of a 115 degree summer day, you got cooked. Literally. The desert winters felt surprisingly harsh, dropping temps into the 20's and 30's, a bitter cold for people accustomed to blazing summers.

I learned over time how to manage your thermostat and, ultimately, your electric bill, developing these key principles:

If you're not home, leave the air conditioning off

Air conditioning is designed for your comfort, but what good does that comfort do you if you aren't home for it? Granted, coming home to a cold home in winter or a hot house in summer can feel miserable, but the unpleasantness is temporary as turning on the air conditioning improves the temperature within a few minutes.

Throw it on once you get home, if you need it, and it shouldn't take long for the home's temp to normalize. People who work during the day in hot locales benefit most from this approach.

Set the thermostat at 78 degrees in the summer

The normal comfort zone temperature sits around 72-73 degrees, but an air conditioner isn't a highly scientific machine. In hot weather, air conditioners only blast cooling freon with air into the room until its internal thermometer reaches the indicated temperature, then stops until it goes a couple degrees above, then starts again until it returns to that temperature, and back and forth it goes.

The difference in where you set the thermostat only affects how much cold air it blows into the room. The lower temperature at which you set the thermostat in summer, the more air it blows in.

Setting the thermostat at 78 degrees typically keeps enough cool air in the room for comfort. Unless you developed a keen temperature sensitivity, you won't likely notice the difference between 73 degrees and 78 degrees. But your electric bill will certainly show it, as your A/C will not run as frequently, and as long. And if you spend the day outside in the heat, coming inside to 78 degree indoor air feels a lot better anyway.

Set the thermostat at 60 degrees in winter

Basically as I said above, except replace the cold freon of the air conditioner with the heated air of the heater.

You won't notice the cold while asleep as long as you have sufficient blankets. Buy a down comforter for bed, and how warm it keeps you may surprise you.

Some recommend shutting the heat completely off before bed. While normally sound, I understand that in places where the temps drop precipitously low at night, below the teens and such, this can make the room temperature dangerously low. If you live in such a place, please wear layers at night and, if you must, keep a heating source on.

Make sure air circulates during the summer

Buy oscillating fans and use them in each room. On milder days, shut off the A/C, crack the windows and try to get by on just circulated air as long as you can. Often, air feels hotter simply because it stagnates indoors and doesn't circulate.

Find inexpensive excuses to go out

Since you won't use your A/C when you're not home (right?), try to spend time away from home during your free time, so you have an excuse not to use the A/C. Go to a bookstore. Go out to dinner. Go to a concert, go run some needed errands, go hang out with friends... anything to get out of the house... and remember to shut off your thermostat before you leave, of course. (Obviously, if you drive, try to multitask so you don't drive too much, or you may use so much gas that it offsets any cost savings)

One added bonus: most of these places have air conditioning.


While by no means a comprehensive guide, these starting suggestions should help you save electricity and, utlimately, money on your electric bill.

Below are materials that can further help you save energy and lower your energy bills:

Questions & Answers

  • Does it use more electricity to leave the thermostat set at 82 or 78 degrees?

    It depends on your objective: Are you cooling your home or heating it? If attempting to keep your home cool during hot weather, then setting it to 78 may use more energy. Meanwhile, if trying to keep your home warm during cooler weather, 82 is going to use up more energy.

  • If a room is 80 degrees Fahrenheit, does it make a difference if I set the thermostat at 60 or 70 for an hour?

    It probably would not make a huge difference at just one hour. The thermostat will automatically run until its internal temperature passes the temperature mark you've indicated, and it probably won't work strongly enough to get the room temperature to 70 within an hour, let alone 60. You could probably set it at either setting and get the same result, using the same amount of energy.

    The only concern would be if you forgot to turn it off after an hour and set it to 60. You could end up using a lot of electricity, and end up with an uncomfortably cold home!

  • If it is 80 degrees Fahrenheit outside, and my house is 72 inside, and I know it will get warmer, and I turn the A/C on, should I set it at 74 or 77?

    It depends on what temperature you desire for the interior of your home, as well as any concerns about electricity costs. Obviously, if cost is a concern, and 77 doesn't feel uncomfortable, then set the thermostat at 77. If that feels a little muggy or warm, then go ahead and set it at 74, cost permitting. Keep an eye on your energy bill!


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    • Steven Gomez profile imageAUTHOR

      Steven Gomez 

      2 months ago from Chicago, IL

      It's probably doing the bare minimum required for it to be technically functioning, so he may be right about not being obligated to replace or repair it. The thermostat may say 69 degrees but the internal functioning system apparently isn't able to get it below 74 for various reasons. Whether that's an insulation issue, a difference in the system's read temperature vs the temperature in your home, or just limits in what the system can do, I don't know. But it doesn't appear the system is outright broken if it's able to cool the place below 75 degrees.

    • profile image


      2 months ago

      I live near Tampa Florids and it is 85 outside and 74 in my house with the thermostat set to 69. Landlord had someone come out and said it is all working properly. Is he full of it or correct?

    • profile image


      13 months ago

      This is a sure lot helpful because I'm doing an IPL Take Action Kit and this sure helped me but I have 1 question? How much should you turn down your thermostat in the winter?

    • profile image

      Juan v. 

      15 months ago

      Good ideas thanks alot.

    • profile image


      15 months ago

      I'm sure some of these methods work when you live in a mostly DRY climate. However, these are like the worst suggestions for those who live in humid subtropical climates. I can't fathom opening a window in the middle of August during the day in Houston to let air "circulate." Lol, what air?

      There's also a huge difference between 73 and 78 degrees when there's an 80-90% humidity rate. I also can't imagine turning the AC off prior to leaving the house. Our power was out for half the day yesterday and it took about 15 hours to cool the house downp

    • profile image


      20 months ago

      Great job! Thanks for sharing it. Smart AC Thermostat is a wonderful electronic device. It provides complete solutions of heating cooling, power and saves your money.‚Äč

    • profile image


      23 months ago

      So this writer's method to save money is to go spend money outside your home so you don't have to cool it. An expensive hydro bill maybe runs up to $500, and if you go out even for a cheap dinner it will cost you $8. If you do that every night that's half your hydro bill in order to save yourself a couple hours a night of a/c usage that would maybe amount to $40 over the month. And don't even get me started on going out to a concert to save money, this article is ridiculous.

    • profile image


      2 years ago

      Turning off your AC when you're not home? LOL, that's HORRIBLE advice, especially for anyone living in a hot climate. Get yourself a programmable thermostat and set your AC to go up 3-5 degrees when you're not home, and then come back down to temp when you are home. Even better, make it a smart programmable AC like a Nest or EcoBee. Seriously, turning off your AC is just very bad advice.

    • profile image


      4 years ago

      I usually shut the vents in the rooms that I am not using.. I keep mine at 74 and my bill don't run any more the 50.00 a month ... I also use aluminum foil on my Windows and it also helps keep the heat out..

    • profile image

      i live in miami at what temperture do l leave my a/c unit on andwhat temperture I leav it when im nit at home 

      6 years ago

      At what temperture do I leave my a/c unit on and when im not home at what temperture do I set it at

    • profile image

      misty atkins 

      6 years ago

      Leaving your unit set to 72 year round lowers your bill. I have done it this past year pulled all my bills out a save about 300 this past year by leaving it set at one temp year around. Put it really depends on what temp you like, but cutting it on and off the temp in your house is never stable which can cause cold and extra. Leave it at one temp for a month and tell me if you don't see a difference in the bill

    • profile image


      6 years ago

      There are many downsides to leaving the a/c off all day while you are gone, ranging from unsafe conditions for pets to food spoiling on the counter and in the cupboards, not to mention how hard your refrigerator and freezer work in those condiotions. Add to those the uncomfortable feeling for up to 2 hrs when you finally try to cool your home enough to prepare a meal over the stove. I find this approach somewhat extreme.

    • whitton profile image


      7 years ago

      Great Hub. I agree that having your thermostat set at the correct temperature definetly lowers your monthly bill.

    • profile image

      roofing contractors Miami 

      7 years ago

      Since the issue of global warming has become a hot seat, the number of people who are aware in saving the Earth increase every year. It is good to see people who are finding alternatives to be able to avoid carbon emissions and follow the green tips. This practice help us to be responsible in using the things around us.

    • profile image


      8 years ago

      I turned my ac up to 78 on both floors and started using ceilking fans and my power bill went from $313 to $450..

      I dont know what else to do int his economy its feast or famine. I cant afford to pay $450 a month for power. My gas bill is a whole nother story..

      Atlanta GA

    • Steven Gomez profile imageAUTHOR

      Steven Gomez 

      8 years ago from Chicago, IL

      Of course, Mike, you could also open the windows when you get home. Enclosed spaces tend to stay hot for longer periods, as I found out the hard way growing up in Vegas. If I kept my door and windows closed while, say, running the computer, it got HOT.

      It probably makes sense to air out your home when you return home, before turning on the A/C. Honestly, otherwise, you're burning power and jacking up your electric bill.

    • profile image


      9 years ago

      turning off your a/c when you are not home is a bad idea. when you do that you let your house get intensly hot and then when you come home and turn it on it has to run ten times longer to cool the house then it would if you just left it on all day.

      an air conditioner does not run harder at any given time it is simply the length of time that it runs. if you set your a/c to 79-80 degrees and leave it there you will pay much less than if you turn it off. trust me i live in arizona and have been doing a/c service work for 6 years. 79-80 all day is the way to go.

    • Steven Gomez profile imageAUTHOR

      Steven Gomez 

      10 years ago from Chicago, IL

      Caryl: that sounds similar to the swamp cooler my parents used in our house growing up. It was an effective substitute as long as all the bedroom doors were open, making it a pain if you wanted privacy, but nonetheless effective for the most part. Later on, after we had moved out, my sisters installed window-mounted coolers and found those effective and inexpensive as well.

      Lissie: Wow. I can only imagine trying to survive without A/C in 100 degree weather. It appears you've got the best of it thanks to the insulation and keeping the doors/windows shut, but I remember times when the A/C was broke and you just couldn't keep the heat out because insulation in Vegas buildings is so poor. One time I worked nights and my residence's A/C broke. I would wake up with heat exhaustion some nights. It was unhealthy, and fortunately the A/C got fixed within a few days so the situation was temporary, but it's quite a painful experience!

    • Lissie profile image

      Elisabeth Sowerbutts 

      10 years ago from New Zealand

      In Perth yesterday it was 39C ! We don't have aircon - but the flat is insulated on 2 sides, top and bottom by other flats / walls and is south facing so doesn't get much direct sun after 8am. It was hot yesterday - but its the first time I'd have liked a/con - up to this temp(100F) its been OK so long as we close all doors/windows in the morning and open them all about 10pm

    • Caryl Oliver profile image

      Caryl Oliver 

      10 years ago from Australia

      Living in Australia we have to deal with the extremes of temperature and after suffering a great many hot summer days and sleepless nights we did the research on air conditioning and finally installed evaporative cooling.

      Evaporative cooling works by sucking air over water and then circulating around the house, so we have a unit sitting on the roof that sucks in air over wet panels and then the fan is controlled from inside the house - and it is brilliant!

      There are three HUGE reasons why we have gone with this:

      1. No refrigerants so less damage to the environment. Uses about 12 litres of water if on all day.

      2. Very cheap to run - about $1.00 per day as against $1.25 per hour for normal split system air conditioning.

      3. And this is my favourite - you leave the doors and windows open to make it work best! Because it is bringing in cool air through the unit on the roof it needs the windows or doors open to draw the cool air to those areas. So during the day we have the bedroom windows closed and the back end open and then at bedtime we close the back and open the bedroom windows.

      The output is that is will drop the temperature about 10 degrees which is more than enough most of the time without making the place frigid.

      The cost was about the same at other air-conditioning and we just love it!


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