They steadily worked to form a tight seal
Last summer, I had a lot of complaints with my a/c, however although the cooling unit was only three years old, I noticed a significant increase in my biweekly electric bills, however the a/c was running a lot more often & yet struggling to match the temperature control setting. There were certain rooms that always felt warm & clammy. The air from the vents had a musty odor & there seemed to be more dust & other particles circulating in the air, but when I realized that I was suffering from frequent headaches, congestion & a tendency to sneeze whenever I spent more than a couple of hours inside, I called a local HVAC supplier for a/c repair. The worker checked the inner workings of the cooling unit & then ran tests on the ductwork, and he discovered that small holes & gaps at the linkions of the pipes were allowing approximately 25% of the conditioned air to leak out, however fortunately, his supplier offers Aeroseal duct sealing, which is a process that fixes flaws in the ductwork from the inside. The repairs are non-invasive, verified by way of a tablet program & guaranteed for ten years. The worker covered the supply & return vents & then pumped highly pressurized air containing polymer particles into the ductwork. As the air escaped, these adhesive particles adhered to the edges. They steadily worked to form a tight seal. The Aeroseal duct sealing was completed in a couple of hours & without causing any odors, residue or mess, then it resolved all of the problems with the a/c.