Your team did a tremendous job restoring an ancient air conditioning system! The new filter is really paying for itself! Next to the kitchen’s floor duct is a black water cooler and the dog’s water bowls. The top of this cooler used to collect lots of fine dust and blonde dog hairs. Now, there are just blonde dog hairs. Also, because of their special efforts below the floor of rebuilding this plenum system with lots of great insulation, my wife immediately notices that the usual inside temperature of 73 degrees is much colder than before at the same temperature ! I guess she is going to be wear warmer socks and clothing. Looking forward to many years of great operation with the new system. Thank you again!