Based on the provided content, UV-C bulbs for HVAC systems have a predictable lifespan and require a specific replacement schedule to remain effective:

  • Standard Lifespan: Most residential UV germicidal bulbs last between 9 to 12 months, which is approximately 9,000 hours of operation.
  • Usage Factors: A bulb may need replacement closer to the 9-month mark in homes where a variable-speed fan operates for more hours each day. Conversely, systems with shorter seasonal runtimes may last up to the full 12 months.
  • Performance Degradation: It is important to note that UV-C output degrades over time even if the bulb still emits visible light. Dust accumulation on the bulb surface can also block UV-C wavelengths, further reducing its effectiveness.
  • Maintenance Recommendation: To ensure continuous protection against mold, bacteria, and viruses, it is recommended to replace the bulbs annually. Aligning this replacement with your yearly furnace tune-up or air conditioning maintenance visit is the simplest way to ensure the system maintains the intensity required to neutralize microorganisms.

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