I had a problem on a cold night with no heat. We checked what we knew about and did get it working. So I called the next day to have someone come and check out the whole system anyway. So in checking , he found a part needed replaced and he told me how much it would cost. Then with my ok , he went right to work and was finished in a reasonable time. They call to let you know when they are coming , call when they are on the way and give an itemized receipt.. This is a friendly and professional business that I will continue using.