New Orleans ranks among the top five U.S. cities for airborne mold concentration, with spore counts exceeding 50,000 per cubic meter during fall and spring. This mold load, combined with humidity that rarely drops below 60 percent, saturates HVAC filters faster than in arid climates. A filter rated for 90 days in Phoenix might last 30 days here before restriction becomes problematic. The moisture in our air carries more particulate mass than dry air, loading up filter media at accelerated rates. After rain events, mold spores spike dramatically as ground moisture evaporates, overwhelming filters already compromised by daily humidity exposure.
Local building codes in New Orleans require proper ventilation in new construction, but older homes built before modern IAQ standards often lack adequate fresh air exchange. These homes rely more heavily on filtration to maintain acceptable indoor air quality. We understand the construction patterns across different neighborhoods and which areas have older housing stock prone to infiltration problems. Our experience with New Orleans homes means we recognize when filter problems indicate larger ventilation or moisture control issues specific to Gulf Coast architecture and our water table proximity.