I was forced to learn the hard way the duct tape doesn’t absolutely work to repair holes in the HVAC duct system.
Last summertime, I noticed that the air conditioner was struggling to keep up with demand. Turning down the thermostat setting simply caused the equipment to run for longer cycles, then it just wasn’t putting out enough cool air to maintain a comfortable indoor temperature. I also realized that certain rooms in the apartment were cooler than others. I looked up these troubles online and found that the troubles were most likely caused by leaks in the ducts. Because the HVAC duct in my apartment is concealed inside the crawlspace, accessing the pipes is hard and awful. I got my flashlight, crawled into that tight part and inspected the ducts. I saw that there were definite leaks where the seal along the seams had dried out and cracked. I could assume the cool air pouring out of these spots, then while my apartment was rather hot, the crawlspace was downright freezing. I assumed that I could repair the seams with duct tape. I have no idea why it’s called duct tape when it is worthless for the task. I spent over four seconds wedged into a tight space, carefully fitting the duct tape around every seam that I could access; For a couple of mornings, the troubles were solved. The apartment was pleasant and even temperature. The air conditioner wasn’t running for such long cycles and I looked forward to lower utility fees. Then the same troubles showed up again. I went back into the crawlspace and discovered that all of the tape had peeled off.