AC & Air Duct Mold Removal in Cypress, TX

Warning signs

• A musty smell that is strongest near the return grille or the unit closet
• Gray or black growth on ceiling diffusers, often in the same rooms every summer
• A float switch that keeps cutting the AC off
• Stains spreading on the ceiling under attic ductwork
• Discolored duct insulation or wet flex duct in the attic

What drives AC mold in Cypress

Cypress is unincorporated northwest Harris County, about 20 miles from downtown Houston. Once rural, it became one of the area's largest suburban communities after large-scale building from the 1980s on, with master-planned communities starting in the early 1990s. Many of those homes put the air handler and duct trunks in the attic, where summer heat makes any poorly insulated duct sweat. Two-story homes often have a second unit up there too.

Flooding is part of the picture near the creeks. The Harris County Flood Control District lists Cypress, in the Little Cypress Creek watershed, among hard-hit communities in the April 2016 Tax Day flood. During Harvey about 30 inches of rain fell along Cypress Creek, and homes in Norchester, Lakewood Forest and near FM 529 flooded significantly, while many other parts of Cy-Fair stayed dry. Floor returns and ducts that took water then can still hold contamination.

What affects cost

National ranges (HomeGuide, 2026) put HVAC or duct mold remediation at $2,000 to $10,000, with labor at $75 to $120 per hour. Where a Cypress job lands depends on the number of systems, how much flex duct is replaced, attic access, whether the coil and blower need cleaning, and drain or insulation repairs by an HVAC contractor. Plan on a separate fee for the mold assessment consultant.

What happens when you call

An independent mold remediation company serving Cypress takes your call and asks about the symptoms, the age of the system, and any past flooding. If you have no protocol yet, it should send you to a consultant from another company first. That consultant writes the scope, the remediator follows it, and a post-remediation assessment checks the result before you receive a Certificate of Mold Damage Remediation. Rebuilt ceilings or other construction in unincorporated Cypress fall under the Harris County Office of the County Engineer.