I'm talking about in terms of using the AC (air conditioner) for cool air and hot as well. Sometimes I will just sit in my car for about an hour with the heater on on the phone to get away from my noisy house.

I have a Honda Accord Coupe 2006 V4.

Also if it does depend on what kind of car one has, how much of a difference does it make?

You won't see any difference in your driving mileage since you are not moving. Honda V4? I thought they were a straight 4 or a V6. It makes a big difference as to the type of car, color, glass area, size of engine and compressor, how cold you like it. Even if you burned an extra gallon of fuel in 1 hour, doubt it but, it costs you $3. Is it worth the quiet>

Tbank you and yes!