I have been having a problem with the furnace in my home for over four years, and Paul Revere Revolutionary Service has been unable to figure out the problem. They were the ones who had installed it, but years ago the pipes started making a banging noise, which only got worse during the night. Throughout those years their technicians have come out to try and fix the problem, but they still haven't been able to find the issue. Their workers have all been lovely, but if it doesn't get sorted out soon, I'm going to look for another company.