Excellant
Greiber did an outstanding job, with prompt service, careful installation, attention to back entry and masking due to Covid 19, explaining the system, returning to fix noise in damper, and spotless clean up. I was disappointed that the repair of the noisy damper was not listed on the warranty, therefore, I will be billed for that part, even though it is a vital part of the operation of the furnace, and should be covered, as all the other vital parts are.