Unless you have experience with brazing, electrical work, plumbing, and framing – and can handle refrigerant according to EPA regulations – installing a central air conditioner yourself is ill-advised. Professionals have the education, skill, and experience to install your central air conditioner safely and properly.
Not all contractors have the appropriate certifications and experience to work on your HVAC system. It's smart to seek out reputable, qualified contractors in your area. You can start by looking at online customer reviews on Google, Yelp, Citysearch, and more, which often reflect the quality of an HVAC installer. Don’t choose the cheapest bid or closest contractor without vetting their qualifications first. AHRI recommends finding a NATE-certified technician, as they have passed a nationally recognized test showing they know how to size, repair and install the proper system for your home.
Although professional HVAC installers often give specific recommendations on central air conditioners, take some time to do your research before you call so you can explain your needs.