Ductwork Repair, Sealing & Airflow Balancing
In a Phoenix attic that hits 150°F, a leaking duct is not just wasted air. It is superheated attic air being pulled into the system you are paying to cool.
Duct leakage in a typical Phoenix attic wastes a substantial share of the cooling a system produces and is a leading cause of hot rooms and high summer bills. Reliable Air tests duct systems for leakage and static pressure, then seals, repairs, or resizes them to restore designed airflow.
Most Valley homes run flexible duct through an unconditioned attic. Over twenty or thirty years, those runs sag, crush against framing, pull loose at the boot, and lose their mastic seals. We routinely find return plenums that are effectively open to the attic, pulling 140°F air directly into the air handler.
Airflow problems also show up as equipment failures. High static pressure from undersized or restricted ducts makes blower motors work harder and shortens their life. If a home has replaced two blower motors in five years, the answer is almost never a third motor.
Duct services
- Static pressure testing across the air handler
- Visual and pressure-based leakage assessment
- Duct sealing with mastic at plenums, boots, and connections
- Replacement of collapsed, crushed, or disconnected flex runs
- Return air sizing corrections and added returns
- Supply register and damper balancing to even out room temperatures
- Attic duct insulation upgrades to R-8
Symptoms of a duct problem
- One or more rooms significantly hotter than the rest of the house
- Weak airflow from registers farthest from the air handler
- Summer bills that keep rising while the equipment is in good shape
- Excessive dust despite a good filter
- Repeated blower motor failures
- Whistling or roaring noise at the return grille
What working with us looks like
Measure, do not guess
Static pressure and temperature readings at the plenum tell us whether the problem is ducts or equipment.
Inspect the attic runs
We physically walk the duct system and document crushed, disconnected, or under-insulated sections.
Seal and repair
Mastic at every joint, boots resealed to drywall, collapsed runs replaced with properly supported flex.
Balance and verify
Airflow rechecked room by room after the work so the fix is demonstrable, not theoretical.
What it costs
Targeted sealing and repair of problem runs is typically a few hundred to a couple thousand dollars. A full duct system replacement on a mid-size home is a larger project and is quoted after a full assessment.
Ductwork & Airflow questions, answered
How do I know if my ducts are leaking?
The clearest signs are rooms that never cool, weak airflow at distant registers, summer bills rising without an equipment change, and dust that reappears immediately after cleaning. A static pressure test plus an attic inspection confirms it in under an hour.
Why is one room always hotter than the rest of my house?
Usually a duct issue — a crushed or disconnected run, a boot that has pulled away from the ceiling, or a supply that is simply undersized for the room. Less often it is a load issue, such as a west-facing room with large single-pane windows, which calls for either balancing or a dedicated mini split.
Should I insulate my attic ductwork?
In a Phoenix attic, absolutely. Older R-4.2 flex loses a significant amount of cooling capacity between the air handler and the register when attic temperatures exceed 140°F. Upgrading to R-8 is one of the better returns available on an existing system.
Get ductwork & airflow handled today.
Same-day service, honest pricing, and a real human on the line. We have kept Phoenix cool since 1996.
Mon–Sat · 7am–7pm · 24/7 emergency line for no-cool and no-heat calls · ROC 330516 · ROC 264944