Air Duct Sanitizing in La Mesa, CA

Does sanitizing actually fix a smell, or just mask it?

Fair question. Sanitizing is a finishing step, not a cure. An antimicrobial fog settles on duct interior surfaces. It does nothing about the thing feeding the odor. Debris has to come out first. Spraying a dust-loaded 1970s flex liner just makes damp dust. So we clean, then treat, then re-check the source.

Most odor calls here trace to a few things. Rodent droppings and nest material in attic or crawlspace runs, common on the rural east side. Sweating supply plenums during marine-layer mornings, which wets settled dust. Or a disconnected boot at a register take-off, pulling attic air and insulation fiber straight into supply. That last one is a sheet metal and mastic fix, not a chemical one.

Material matters. Cracked gray flex liners shed; they hold product poorly and often need replacement instead. Original 1950s–60s galvanized trunk lines take treatment well because the surface is hard and smooth. Paper and tar wrap on some pre-1960 plenums is left alone entirely, never brushed or sprayed.

Products used are EPA-registered for HVAC surfaces. We tell you the name. If a home has chemical sensitivities, we do mechanical cleaning and source repair and skip the fog.