Air conditioning/heating systems should be bought from dealers recommended by major manufacturers through their dealer locator services.
Major HVAC (heating ventilation and air conditioning) manufacturers are extremely concerned about customer satisfaction and recommend dealers that have been well trained in installation of their equipment and provide a good value for the consumer. If for any reason you are not satisfied with your installation or equipment, you can go directly to the manufacturer and the manufacturer can usually insure that you are satisfied, if the manufacturer recommended the dealer.
Tip: The best deals on purchasing can be obtained in the intermediate seasons, when the dealers are least busy; March, April, May, September, October and the first three weeks in December. Many dealers will take jobs at very close to cost at these times just to keep their installation crews busy.