One room not cold traced to room-side restriction, not low gas

What we found

One-room cooling loss needs comparison first. We checked how the affected room behaved against the other rooms.

• Other rooms were still cooling normally
• The affected room had weaker airflow and poorer cooling
• The pattern pointed to a room-specific indoor-side issue

The problem was in the indoor unit serving the warm room. Coil and airflow restriction in that room reduced cooling, while the other rooms performed normally. A system-wide gas issue would affect all rooms similarly.

What we did

No system-wide gas work needed. The issue is in the indoor unit for the warm room only. Restoring its airflow and coil condition brings that room back in line with the others. We compare all rooms after to confirm the system is balanced.

After the room-specific indoor-side issue was corrected, the warm room cooled normally again. No system-wide work was needed.

What we learned

How to tell a room-specific fault from a system-wide gas problem.

• Low refrigerant in a shared system reduces cooling across all rooms in a similar way. If one room is clearly worse while the others are still cold, the gas level is probably not the issue.
• When only one room is affected, the fault is almost always in that room's indoor unit — restricted airflow, a dirty coil, or a coil condition specific to that unit.
• Comparing room-by-room cooling behaviour before approving any system-wide work prevents paying for a gas top-up that would not fix a room-specific problem.