What is cheaper running the ac at 75 all day or just activating it when you get home putting it at 70?

By | November 20, 2015

i’m pretty sure that it is the first one because i read a lot of online articles.
it takes about 2 hours to cool down the house in summer weather.

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2 thoughts on “What is cheaper running the ac at 75 all day or just activating it when you get home putting it at 70?

  1. oneman2dogs

    Ultimately, it is cheaper to maintain a set temperature, 24/7, than to let temperatures fluxuate up and down. You can’t just look at your utility bill to see the savings, you must consider the wear and tear on your heating/cooling system, replacement costs, etc. A properly installed heating/cooling system set at 68 degrees will allow temperatures to rise to 78 degrees before the cooler kicks on and drop to 58 degrees before the heater kicks on.
    I’m a retired HVAC tech. and maintain my home at 60 degrees year around.

  2. Dan B

    That depends upon how long it takes to bring the temperature down. If it takes 45 minutes to bring the temperature down from 75 to 70, then that time should be your guide. If you will be gone for more than 45 minutes, then it will be cost effective to set the temperature higher until you get home.

    We set our thermostats to 85 when we leave for extended periods. It doesn’t affect our refrigerator operation either.

    It has been proven that it does cost more to maintain a lower temperature 24/7. AC systems cycle no matter what temperature you have set, so wear and tear due to starting and stopping isn’t the issue.

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