When an air conditioner or furnace goes out, the resulting lack of temperature control leads most people to make hasty decisions about what air conditioning and heating company they hire. In most cases, the simple fact that air conditioning contractors are licensed, bonded and insured is enough to make most people feel comfortable about hiring them. But there are some other crucial indicators that also distinguish a reputable heating and air conditioning company from one that isn't. Below, we list six indications that a residential air conditioning contractor isn't the best choice for heating and air-conditioning replacement, even if the contractor is licensed, bonded and insured.