A quick primer on the HVAC and testing side of a real estate transaction involving past mold or water damage.
A remediation certificate confirms the visible mold and affected materials were addressed. It doesn't automatically confirm the HVAC system — ductwork, coils, filtration — was part of that process. If you're buying a home with a disclosed mold history, or selling one and want documentation for buyers, an independent HVAC-focused assessment fills that gap.
California requires sellers to disclose known material facts that could affect a buyer's decision, which generally includes known past water damage or mold issues. Disclosure requirements are a legal question best confirmed with a real estate attorney or your agent — we're not a legal resource, just the HVAC/testing side of the picture.
Not necessarily. If the HVAC system wasn't specifically isolated, cleaned, or verified as part of that remediation, it can remain a contamination path even after the visible mold is gone.
Yes — our buyer's HVAC inspection can include mold testing as part of the same visit, giving you real data before you're locked into a purchase.
See our buyer's HVAC inspection or the full Mold & CIRS Support guide.