I use their annual maintenance service plan.
Everything turned out fine when I recently used Airsmiths Home Performance. I have been using them many times before. This time they came out to conduct their annual maintenance call for our heating system. The technician was very knowledgeable and polite. He was professional and informative also. Airsmiths Home Performance offered to sign up for their annual maintenance contract for my air conditioning unit. So I signed up for that one too. I suppose the technician was doing his job by offering that, as well as doing what he initially came out to do. I would definitely recommend them to others.