Why is my air conditioning not working on my central heat and air?

CinCin questioned: My heat works and my air conditioning does not. Would anyone know why. Do these units need freon to work? Thanks for your time.
Oh, wanted to question also. Is there a switch or something that I might have to switch on / off?

Is it possible for a home air conditioning unit to be the cause of its coils going bad?

ultradevguru questioned: My Mom owns a Trane air conditioning unit and has had nothing but problems with it. She had the coil replaced on it a couple of years ago. Now a technician is telling her that the coils are terrible again. They are telling her that there is something in [...]

Does using the air conditioning in my car increase the amount of fuel used?

Jordan N questioned: Does using the air conditioning in my car increase the amount of fuel used? And also, by how much? for example, if it does increase the amount of fuel used, is it a negliable amount? or is it rather significant?

How much of an effect does air conditioning have on my gas mileage?

Manda questioned: The gas mileage for my van seems to bottom out in the summer months when I have to use the air conditioning. This year, so far, it seems worse than ever. I am getting about 30 miles less on a tank of gas. Any suggestions or insights?

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