![]() When you're away from home, it's best to set your AC to around 85F, cranking it down to your preferred temperature when you return. The greater the difference, the more it has to work and the more it'll cost. What's most important here is the difference between your AC setting and the outside temperature. If that's too warm for you, drop it one degree at a time until the room becomes tolerable. The Temperature That's Best for Balancing Comfort and Cost.Įnergy Star recommends going no lower than 78F. If you just watch it sink without stirring, it could be some time before the particles dissipate, achieving equilibrium and distributing themselves throughout the water homogenously. Imagine squeezing a drop of blue food coloring into a glass of cold water. Unfortunately, this can often be a painfully slow process to move things along, you can force the cool air to circulate throughout the space by using a fan. To cool down the rest of your home, you'll have to wait for thermal transfer to get the job done naturally for you. For central units, the coolest areas are right around the vents. For window AC units, this means that the area right in front of the unit is coolest. ![]() In fact, ACs work way better when working together with fans ( Especially automated ceiling fans!).Ĭool air accumulates wherever it gets dumped out. ![]() Fans and ACs should not be seen as either-or, though. Most people use a fan when it's warm and switch to the AC when it's hot. This also means that your unit will need to stay on longer-wasted energy and higher bills. The more air space that needs to be cooled, the longer it takes to cool it all down. If all of your vents are open, the central unit is trying to cool every one of those rooms simultaneously. You probably have AC vents located in every room of your house. This will limit the amount of air to deal with to what is contained in that room, helping speed up how quickly the air is cooled. To maximize efficiency, keep the doors closed in any room that has a window unit running. In effect, the unit is trying to cool the air in your room and outside the room, a volume it might not be rated to accommodate. The cool air will leak out, and warm air will leak in. Your bedroom might be 150 square feet, but if you leave the door open while the unit runs, you've got a whole lot of hallway that you now need to factor into the equation. Remember how window units are designed with a certain amount of air space in mind? That air space assumes that all of the doors connected to the room are closed. There are a couple of different scenarios to run through here. If you're tired of coming home to a hot and stuffy house, consider getting a smart or programmable thermostat. The lesson: set your AC unit to your ideal temperature and let it do the work. Now, you're simply too cold and have unnecessarily wasted a lot of energy. If, for example, your ideal temperature is 72F and you set the unit for 65F, the unit will keep going until the room hits 65F. This is because the AC unit will keep working even after it reaches your ideal temperature. It's the worst thing that you can do in this situation. The temperature setting only tells the unit when to stop pumping out cool air changing the setting from 70F to 65F won't speed up the process. Your AC unit pumps out the same "strength" of cool air at all times, whether your room is 70F or 90F. What do you do? You might think that the best course of action is to crank your AC all the way down to 65F so the room will cool faster, but that's not how air conditioning works. After coming home from a long day at work, you step inside, only to be slammed by a thick wall of stale, 90F air.
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