I heard an unusual sound coming from the attic.
It sounded like a hissing noise. It did not exactly sound like a snake, but the hissing sound reminded me of a slithering reptile. I heard an unusual sound coming from the attic for a couple of afternoons. On Wednesday when I was off work, I decided to fully inspect the attic to see if I could find the problem. I got out a flashlight and I carefully lifted myself into the attic space. I had to maneuver around all of the Christmas and Halloween decorations! When the heating and A/C system started running, it startled me for a minute. It was absolutely really loud in the attic! A few hours after the heating as well as the A/C system started, I began to hear the same hissing noise. I carefully listened to the noise plus followed the sound. I heard that sound coming from the HVAC duct. I noticed that pieces of metal seemed to have a small gap. There should have been a piece of tape on the pieces of metal to connect them, but they were flapping around. I realized this was the reason for the hissing sound. I grabbed some duct tape from the garage and I carefully added tape to the edge of the sheet metal to seal up the area that was loose. As soon as I put the tape over the hole, the whistling sound immediately stopped. I do not want to brag about my skills, but I’m pretty sure that I saved myself a few hundred dollars by doing the work myself instead of calling a professional.