HVAC duct insulation in a 1983 is held together with failing duct tape how should this be worded?
“HVAC duct insulation is held together with failing duct tape. Recommend repair/replacement by a qualified person.” 
The supply air duct in a non-condition space has insulation separation allowing temperature loss Recommend repair/replace as necessary;-);-)
Boiler/plate
The HVAC ductwork is a total FUBAR, toss it.