I never write these things but I felt I had to today. I was at my wits end having no heat for a day in 13 degree weather. I called a ton of places and some were days out for appointments. I reached Tim at Sentry and explained the problem, he said he could take care if it within the hour. He was at my house in an hour and very courteous, professional and kind. He had my problem resolved in a few minutes and went beyond the job and cleaned my furnace at no additional charge. I not only would recommend Sentry but you should make it your first call! Could not be more pleased with my experience.