Re: air conditioning in cars - Is it the case that the colder the a/c, the more petrol you use?
With air conditioning in houses, they say that you use less electricity when the a/c is on a warmer temperature, rather than freezing cold. Does this apply with car air conditioning as well? Does it use more petrol when colder and less when just cool,
Not really new A/C systems do not load the engine down enough to make much difference in fuel mileage.
Difference is in home units the compressor is run off electricity. The compressor is actually a combination electric motor and pump.
In
Walking in this scorching heat and seeing people in their cars with their hair blowing from their air conditioning. -_- 
There should be a traffic lane specifically for cars without air conditioning in 100 degree Florida weather. 
Heading to davis in the rocketship. Fully equipped with air conditioning and radar detector. @ thanks for trading me cars!
Ford Focus (2008) for sale in Meath €8750: Driver airbag, Passenger airbag, Side airbags, Air conditioning, Ra... 