I arrived at the customer's home to inspect their HVAC system. Upon inspection, I found a vent in the guest bathroom that had some growth and was sweating. I inspected the duct work and found no issues. However, I did find three vents that were completely closed, which could be causing issues with static pressures and efficiency. I informed the customer of this and explained that it could lead to sweaty vents and other problems. The customer paid a $79 diagnostic fee with a credit card.
