Why Some Rooms Don't Cool or Heat Properly

• Disconnected or crushed flex run — common in attics where ducts were stepped on or never properly supported.
• Long undersized branch — the run that's too small AND too far from the air handler always loses.
• No return path — closed door + no return = pressure imbalance + no airflow.
• Bad register location — air dumped at the wrong spot never mixes the room.
• System out of balance — the closer rooms steal the air the far rooms need.

"We need a bigger AC" is the most expensive answer to a hot-room complaint — and almost always wrong. A bigger system pushes more air into the same restricted ducts, which makes static pressure worse and rarely improves the underperforming room.

The fix is in the duct system, the return, or the design — not in a bigger condenser.

• Measure CFM at every register in every room.
• Compare measured CFM to the room's calculated load.
• Inspect the attic run feeding the underperforming room.
• Test static pressure to confirm whether system-wide restriction is part of the picture.