What a wake up, cold and afraid something terrible was wrong with the heating here. But, I made a call and even though it was Sunday AM, someone answered very kind and polite and said someone would call and be at my home within an hour and a half. Well, Keith, called a few minutes later for info, and was at my door an hour later and soon, the heat was back on. Keith was very nice and explained all my questions. Thank you, Nebrasky.