Is it wasting energy when you are running the air condition and some one rolls down a window?
Answer:
YES
Yes, unless it's cold outside! Then again, if it's cold outside energy would still be wasting if the AC is on.
Yes, a rule in thermodynamics is that "heat travels to cold." Place a hot dish on a cold talbe and the table will be hot. If you open a window the hot air will rush in and the air conditioner will have to work harder to cool the air. This translates to more electric because the compressor will have to come on to compress the gas that causes the cooling in the AC itself.
Running air conditioning in general is wasting energy. Humans evolved in both hot and cold weather. Learn to keep cool in other ways, like utilizing the wind to cool your house or just go swimming.
Automobiles operate most efficently without the added workload of an air conditioner compressor. The only time this doesn't apply is at highway speeds when the drag on the automobile caused by an open window causes more fuel consumption than the compressor.
Therefore, when you drive slow, roll the windows down and turn the a\c off and when on the highway roll up the windows and turn the a\c on.
Old car air conditioners could weigh 45 lbs and use 12-15 hp, but new models are only 15 lbs and 3 hp. Since a car engine uses about 0.08 gal/hp.hr, this is costing you about 75c an hour.
At highway speeds, rolling down the windows will cause drag and use more than 3 hp, so the airconditioner is cheaper.
Yes there is a small waste involved because the A/C compressor will have to cycle back "on" a little more frequently to catch up; even though you have A/C on and its cool, the compressor cycles on and off periodically.
You make the car engine work harder and you decrease your gas mileage. Yeah, I'd call that a waste.
A/C's are a waste of energy. Get
a moon-roof.
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