There are many ways to choose a company to install a new air conditioning system. Here are a few things I would recommend checking out:
You will want to make sure that the company you choose is licensed and insured to install air conditioning. Many companies out there claiming they are "licensed and insured" but I always like to see evidence in writing. You can find air conditioning and mechanical ventilation services from various online sources.
The companies need a properly licensed because it allows them to attract the necessary permissions and have the inspection completed by a city or town. It also shows that the company has the necessary training and experience to obtain a license, which means that your work will be done with code requirements.
Ensure that contractors are properly insured to do your air conditioning installation; you will want to make sure that the air-conditioning contractor carries liability policy and a worker's compensation policy to employees.
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Also, ask a few questions about the company's hiring and screening process of their employees. You will want to find a company that does background checks and drug screenings on its people. I would like to have an idea of what kind of people would come to my house.
There are a lot of contractors out there who have no hiring policy in place. It makes you think about who you will allow in your home. Do not forget to ask the contractor for customer references in which they have been doing work similar AC.
I would also recommend visiting the Better Business Bureau website. They have made it very easy to check for any contractor by simply typing in their company phone number. It tells you a lot about how a company does business.