When I installed our modern gas gas furnace several years ago, the HVAC contractor who handled the project commanded that I enroll in a repair idea with her contractor, then since I’d taken out a loan to cover the cost of the gas furnace, I was reluctant to spend more money, however the heating idea was already covered by a manufacturer’s warranty, and I assumed it would operate reliably for at least a few years, then i declined the repair agreement and planned to have the gas furnace professionally worked on in a couple of years; Although I was diligent about replacing the air filter every few weeks, I totally forgot about scheduling professional upkeep. The gas furnace seemed to operate just fine. It always started up in the fall and kept the house moderate throughout the winter. I failed to notice the longer running times and didn’t pay enough attention to the rising cost of our heating bills. The gas furnace eventually quit in the middle of December, when the outside temperature was sixteen degrees. Since it was a weekend, I was forced to pay for overtime emergency repair! Had I enrolled in the repair plan, there would have been no extra fee. If I’d have kept up with professional service, our manufacturer’s warranty would still have been in effect. Instead, I was responsible for the full cost of parts and labor. The accumulation of dust inside the gas furnace had jammed airflow and restricted the operation of moving parts. I’m severely lucky the heat exchanger reMEd in tact or I’d have needed to update the whole gas furnace. I have, however, l earned our lesson. I instantly invested in the repair agreement with the local HVAC contractor.