Should one cold room lead straight to a duct replacement?
No. First separate how the room feels from the amount of air you can feel at its vents. A cold room does not prove a duct has failed. Say which vents have less flow, whether other rooms differ and when the change began.
Map the problem from inside the home
Make a room list rather than opening ceilings or reaching into vents. Mark where airflow feels weak and where it feels normal when heat runs. Note furniture or belongings that cover a vent or return. Keep equipment doors closed. Leave hard-to-reach filter housings alone.
Say if the problem started after moving furniture or work in the home. Timing is a clue, not proof of cause. Do not close other vents to force air toward the cold room. Describe the system as it is instead of trying to balance it yourself.
Check permission for access
In a North Naples condo or shared building, a room grille does not show who controls the duct beyond it. Ask the owner or manager about access above ceilings, in shared spaces or on the roof. The work may extend outside your room.
Share plans or past repair records if you have them. It is fine to say the layout is unknown. Ask what can be checked with finishes intact. Find out what needs consent before any opening is made.
Clarify the reason for duct work
Ask how the repair relates to the affected vents. Was airflow checked across the system? Separate equipment repair from duct changes or a visible blockage. Confirm who approves and restores any openings. Collier County's A/C replacement guide includes added documents for duct changes. Check which rules apply to the address and work.