How often should I have my air conditioner & heater serviced?

How often should air conditioner & heater be serviced? It is a very good idea to have your air conditioning &

How do I choose a good brand air conditioner?

how, do, I, choose, a, good, brand, air, conditioner The answer to this question is, in part, tied to the question:

How often should an AC air filter be replaced?

How often should an AC air filter be replaced in Arizona? The frequency at which you should replace your air condition