For years after buying our house from it's builder, we were frustrated with he inability of the air conditioner to cool our top floor while leaving the basement freezing. Different contractors and so-called experts told us the only thing we could do would be to turn down the temperature further to sufficiently cool the upstairs but this meant completely freezing out the basement. Finally, we came across [insert name]. Vikter came to see us on a Saturday afternoon and within a few moments had identified our problem: there were huge gaps where are ducts joined together and even bigger holes where they had been improperly fitted together. He demonstrated the leaks that were occurring with an infrared camera screen so that we could see the problem for ourselves. Vikter's solution was to run a water based sealant through the system that coagulated at every gap and sealed them tight. He also expertly opened the walls where the ducts had to be reattached properly, did so, and then resealed the holes in the walls. The improvement was remarkable. We went from having the equivalent of a two foot square hole in our ducts to the equivalent of less than a square inch. The airflow through most of the upstairs ducts tripled and the upstairs now cools as quickly while the basement is now comfortable. Aeroseal worked neatly, cleanly and efficiently. We cannot think of anything of the many things we have done to improve our house with which we our more pleased.