I had a noise in my new high-efficiency system. It wasn’t loud but I noticed it. I needed to replace attic ductwork anyway, so we hoped that might resolve it. Workman did a great job with Attic ductwork, but it did not completely resolve the noise. Michelle in the office sent Senior technician Ahmad Especially for this troubleshooting. He checked all possibilities, ruled out mechanical and resolve it with gas pressure adjustment. Excellent work In under one hour time. Thank you again, Each service has been at the top level.