Learning Center · Intent 1 — Learn

Dust Storms & Haboobs Learning Center

Protect filters and coils when the wall of dust hits

Primary question

What should I do with my HVAC during and after a dust storm?

Haboob and dust-storm guidance for Phoenix Valley homes — filter cadence, recirculate mode, outdoor coil care, and when to call.

Prepared from A&A service guidance for homeowners. A named reviewer is shown only after that attribution is verified; education comes before scheduling.

Homeowner guide

Definition → When to use → Failure modes → Proof → Action

01 · Definition

Haboobs and dust storms load filters and sandblast outdoor coils in minutes. Indoor air gets dusty; systems that were already overdue for a filter change lose capacity fast.
02 · When to use this guide

Use during dust season (often the shoulders of monsoon), right after a storm wall passes, or anytime returns look gray within weeks of a change.
03 · Failure modes

Packed filters starve airflow and can freeze coils. Dirty outdoor coils raise head pressure and bills. Running windows open during a storm undoes filtration and dumps grit into the return.
04 · Proof

Check the filter after each major dust event and record how quickly it loads. Photos of coil debris, measured airflow when needed, and a home-specific replacement cadence are more useful than a generic calendar.
05 · Action

Close windows, recirculate, and check the filter after the storm. Clear debris from the outdoor unit top and sides. If airflow is weak or the system ices, schedule service — don’t keep running a choked system through a heat wave.