Ask the HVAC contractor for local references.
Call to see if they were satisfied with the work. A reputable HVAC contractor will be proud to list their references. If possible, visit a job in progress to see how the contractor works. Talk to the customer about work habits, costs, and the contractor's level of cooperation. Find out if the contractor has maintained the work schedule and honored the terms of the contract.
Diamond HVAC: Contact Us or call 800-666-7722 for a list of Customer References.