No one would leave their refrigerator door open and expect the interior to remain at optimum coolness. Operating an air conditioner is much the same. If you leave doors and windows open while it is on, you cannot expect the house to stay cool. But it's not only windows and doors that cool air can escape from. Sometimes there are gaps around them - especially under doors. Using a draught stopper in the summer is just as important as using it in the winter.
Keep the outside part of the air conditioner clean and clear of bushes and debris from long grass or fallen leaves. If it can be placed in a cool or shady place, then it will function better. When it is not in use, cover it over to keep bugs and dirt out. In the wintertime, close the ducts of a cooling only system so that warm air does not leak out of your house.
If the temperature is below the 24 to 27 degrees Centigrade range, you should only need the fan on, rather than the whole cooling system. This will save on energy consumption and operating costs, as there is a 10% increase in energy consumption for each degree the thermostat is lowered.
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