Replace the UV bulb in your air filter once a year. UV-C bulbs continue to glow long after their germicidal output has dropped below useful levels — typically after about 9,000 hours of operation. A bulb still glowing dim purple may be at 30% of original effectiveness even though it visually “works.”

UV bulb basics

  • Replace annually regardless of visible glow
  • Mark the install date directly on the fixture
  • Use manufacturer-spec replacement bulbs
  • Clean the quartz sleeve at the same time
  • Annual replacement is part of our maintenance plan

We replace UV bulbs as part of every Mainstream Maintenance Plan visit, and offer one-time replacement via indoor air quality.