Came out for noisy duct work for bathroom. Found the duct work is real thin and not insulated. Duct work size is 15†by 5†need about 20’. We need to replace duct work and insulate it. Gave options to do both or just insulate it. While I was here noticed water heater vent was not hooked onto water heater I hooked it back up. I also noticed air scrubber bulb was burnt out. Gave options to fix this and msc club. Today went with msc club. Duct work only make noise in heat mode. System was working properly when I left the call. Hvac system is 2014 same with water heater.