I heard a very strange sound coming from the furnace.
It sounded like two pieces of metal rubbing together.
I was worried there was an issue. Even though the furnace was running just fine, the sound was bizarre and it had me worried. I made an appointment with a local repairman. The repairman came to the house on Tuesday to look at the furnace related problems. The repairman asked me a couple of questions about my home and the condition of the furnace. The woman wanted to know when the last time was that the air filter was changed and she wanted to know if I regularly paid someone to service the assistant. I had not serviced the furnace in a while. I was embarrassed to tell the repair person the truth, so I told her that it had been about a year. I’m sure she could tell that was not true just by looking at the age and condition of the HVAC system. I was very thankful that the repair person took the time to explain the entire process as she looked at the system to put down the odd and bizarre sound. Towards the top of the furnace, there was an old jagged screw that had become lodged in the side of the machine. It was starting to scrape against the side of the system. Every time the furnace came on, the rattling of the screw made that noise. I was happy to find out that it was not a problem with the furnace and even happier that it was not an expensive repair issue.