This is especially true if you're adding air conditioning to an existing home where ductwork must be added. In this case, experience is a factor since it will take more thought, planning and know-how to get the job done. Get a cost estimate. To make a fair comparison, be sure the bids you are looking at include the services you've requested and are based on the same size and efficiency equipment and the same quality of workmanship. Inquire about equipment and labor warranties.
Warranties vary according to manufacturers.
Make sure the dealer explains the terms of your warranty and that you understand it. In addition, many manufacturers offer extended warranties, which you may be wise to investigate. Inquire about preventive maintenance service contracts. Many dealers offer service contracts that call for periodic maintenance of equipment and, if needed, repairs. The fee for such contracts is usually well worth it in terms of obtaining optimum efficiency and performance from your system.