They provide the service and assistance that merited that five-star rating. We've used Jacob Heating & Air Conditioning for years and have literally known them for generations, and the service is always good and timely and accurate--and efficient. They perform maintenance on three existing units we'd bought in the past but continue to maintain. lt is always easy to schedule the service appointments, and they are also prompt in responding if there are issues that need to be dealt with. They are very friendly--and that counts for a lot.