I used Grizzly before to overhaul my very old hydronic heating system, at which time they did a stellar job. This time, they did a seasonal service and installed a smart thermostat. They were able to do so with an older furnace and without a mess when threading the new wiring required. I also had a suspected slow leak from a kitchen sink which was causing damage to the ceiling below. They diagnosed the problem and installed new piping quickly and efficiently. They are innovative plumbing and heating specialists who are able to figure out solutions to challenging problems. They are also great at cleaning up the job site. I recommend them highly.