When air conditioning units are not serviced regularly, they become breeding grounds for bacteria, fungi, including mold spores, which can be circulated throughout the home via the ventilation system. Mold growth in AC systems is more common than you might think and can severely impact indoor air quality (IAQ). The musty smell from your basement indicates potential mold presence; this can irritate respiratory systems and exacerbate allergies or asthma.

Given the recent heavy rains, it’s crucial to address any water intrusion issues promptly. In Dubai/UAE, water damage can accelerate mold growth due to high humidity conditions. Mold can start growing within 24-48 hours in damp environments, making regular maintenance of AC units even more critical for maintaining healthy indoor air.

For a thorough assessment, I strongly recommend contacting professional environmental inspection and remediation services like Saniservice (contact details: Call 800-MOLDS or 800-66537 or email hello@saniservice.com). They can conduct a detailed mold inspection of your AC unit and surrounding areas. Professional remediation involves not just removal but also proper disposal to prevent further spread.

In the meantime, take steps to improve indoor air quality:
1. Ensure your AC is serviced annually by certified technicians.
2. Regularly clean or replace air filters to avoid dust accumulation.
3. Use dehumidifiers in moisture-prone areas like basements.
4. Increase ventilation when possible; open windows for fresh air circulation if weather permits.

Remember, addressing mold early can prevent more significant health issues and costly repairs down the line.