In Spain, there are about 7.3 million homes with air conditioning and most of them don’t know what kind of voracious and carefree critter they have on their hands. They sense it, of course; They have heard rumors, it is true. But only when summer comes and it is eaten around 30% of the electricity bill It is when they understand the reality behind the ‘fresquito’.
That’s when the moral debates also begin. And just when he is going to leave through the door, our protagonist takes control of the air conditioning, directs it towards the split and asks himself… should I turn it off or not? Is it better to turn it off even if when you return the house has become an oven and you have to cool it down again? Or is it true that turning on the device is so expensive that it is better to leave it running all the time?
This is the story of how an old piece of advice has become so embedded in people’s consciousness that it continues to operate even though HVAC technology has changed. It is an answer, also, to one of the big questions of the summer.
From “don’t turn it off” to inverter… As I say, air conditioners have changed a lot. Old compressors had very high consumption peaks and this is the origin of the idea that turning it off is expensive. But current investors They work in a different way and their speed is modulated so that the starts are smooth.
However, this is more of a technical issue. The most important reason to turn off the air is another.
Inside and outside. What really rules in all this is the heat outside the house, the heat inside and the insulation that separates it. The first two factors are important because heat enters the house at a rate proportional to that difference. That means, roughly speaking, that if the house is warm, the heat enters more slowly.
In this sense, if we are going to go out for a few hours, it is best to turn off the air (or raise the thermostat a lot). He US Department of Energy He says it bluntly: the starting peak lasts seconds and you also have to pay for the machine hours.
Is it a good idea to turn it on and off while we are inside? As the OCU recognized, An inverter should be left to regulate only while you are at home. (without constantly turning it on and off by hand) and turning it off “when leaving the room permanently.”
In any case, the question that can save us is not so much whether we turn it off or not as how many degrees and how many hours we have it on. The world of air conditioning is full of myths: from those who think that setting the thermostat lower will cool the room faster to those who confuse the legal minimum for public spaces (27 degrees) with what experts recommend (about 24).
The last thing to keep in mind is humidity… cooling may have become relatively trivial thanks to inverter technologybut dehumidifying is not so much. So in very humid climates it pays more not to turn off the air because recovering a comfortable environment costs more.
But do we turn off or not? It depends on the situation. For a short getaway like picking up bread or running a quick errand, we can leave the air on. The difference is almost non-existent. If we are going to be away for a long time, it is better to turn it off or, at the very least, raise the thermostat.
Image | Kien Nguyen
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