We have a contract with Service All-Stars Heating and Air Comfort. They service all our ambulance stations' air conditioners and heaters. They also installed all of our package units. I continue to use them because they are reliable. And they don't rip us off. And they get the job done. Scheduling is easy. I just call Sal, and he organizes something. They're polite and courteous. They're easy to work with too. I would recommend Service All-Stars Heating and Air Comfort to my family and friends.