What is Monsoon Humidity?
During the North American Monsoon (roughly mid-June through September), moist tropical air surges into Arizona, spiking humidity in a region that's bone-dry the rest of the year. For HVAC systems, it's the one season equipment has to dehumidify as well as cool.
Why it matters in Arizona
The humidity spike is when dormant problems surface: condensate lines that sat dry all spring suddenly clog and overflow, coils and drain pans grow the year's musty smells, and dust-caked condensers crust over. Most “my AC is fine until July” stories are really monsoon-humidity stories.
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