I had a maintenance service for my furnace, the service man showed up and drilled a hole in mt furnace to stick a camera in it. He then said I havd a hole in the heat exhanger and hd nedfs to shut it down and said need a new furnace or I might die from carnon minoxide. I have 4 carbon minoxide sensors in my home which never went off. They sent a sales person who tried to sell me an $11k furnace, but hold on! Tried convincing me I should rent it which would cost me $27k over a 13 yr period! The temperature was -5 that night and i couldn't turn on my furnace because it was tagged. The next morning, after sleeping with my clothes on and 3 blankets, I called another HVAC specialist. He did a thorough inspection, testing the aid quality at multiple points inside, and outside at the exhaust. Checked the heat exchange. Well, there id no hole and he said i don't need a new furnace or anything. My unit is working fine. What kind of sham is Enercare trying to pull?