Mold in Rental Properties & Short-Term Rentals: Austin Landlord Guide

A rental lives through the same Central Texas summer as any house, with the air handler sweating in a hot attic. Tenants and turnovers add their own habits:

• Filters that miss their change date between tenants
• Thermostats switched off or set high while the unit sits empty between guests
• Condensate drains left off the routine maintenance list
• Tenants who live with a small drip or a musty smell instead of reporting it
• Full houses adding moisture from cooking, showers and laundry

1. Answer promptly and in writing, and document the report, with photos if you can get them
2. Have the HVAC system checked: filter, drain, coil, air handler and ducts
3. Find the moisture source: a leak, a drain problem or humidity the AC isn’t pulling out
4. If mold is suspected, have an independent, licensed mold assessor evaluate the unit and write a protocol, the plan the remediation has to follow
5. Hire licensed remediators: Gold Eagle for mold inside the HVAC system, a general mold remediation company for mold in walls, ceilings or furniture. Keep records of everything done

Texas landlords have repair duties under state law, and leases and local rules add more. For notice requirements, tenant rights or what you owe, ask a real estate attorney or your property manager. We can explain the HVAC work; we can’t give legal advice.

In a short-term rental, a musty smell or spotted vents can land in a guest review before you hear about it any other way. Add three HVAC checks to every turnover: look at the registers, smell the air when the AC first kicks on, and make sure the drain line is flowing. Between bookings, leave the AC running at a moderate setting instead of off. A shut-up Austin house gets humid fast.

• Change filters on a set schedule; longer-life filters suit rentals
• Book yearly HVAC maintenance that includes flushing the condensate drain
• Put a float switch on attic air handlers, so a clogged drain shuts the system off instead of soaking the ceiling below
• Hold vacant units at a moderate temperature, with humidity below 60%
• Add a whole-home dehumidifier to units that stay humid
• Ask tenants to report leaks, drips and musty smells the day they notice them

More on mold in the HVAC system:

• HVAC restoration: how a mold job inside the AC system runs, from the assessor’s protocol to clearance
• Signs of mold in your HVAC system: what tenants and guests usually notice first
• Mold Prevention for Rental Properties and Short-Term Rentals in Central Texas

Two guides worth reading before your next turnover: how to keep mold out of the HVAC system, and how long a dry fog treatment lasts.

• Best Practices for Mold Prevention in Your HVAC System
• How Long Do Dry Fog Treatment Results Last?
• Austin Mold Facts
• Whack-a-Mold (a quick game)

See every guide in the Gold Eagle Resource Center