The short answer
Control Humidity Before You Leave
Mold needs moisture to grow, so managing indoor humidity is your most important step. Set your air conditioner to a reasonable temperature, around 78 degrees, to help remove moisture from the air. If you are closing a basement or crawlspace, run a dehumidifier set to keep humidity below 60%. Empty the dehumidifier's collection bucket or use a model with a drain hose connected to a floor drain.
In colder months, do not turn your heat off completely. Keeping a minimum temperature, such as 55 degrees, helps prevent pipes from freezing and bursting. It also reduces condensation on cold surfaces where mold can start. Check that your HVAC system is functioning properly and that its drip pan is clean and dry before you seal up the house for an extended period.
Inspect and Repair Potential Leaks
A small, undetected leak can cause major mold problems while a home is unattended. Before closing the home, inspect all visible plumbing under sinks, around toilets, and near water heaters. Look for any signs of past moisture or corrosion. Tighten any loose connections and replace worn supply lines on appliances like washing machines and dishwashers to prevent future failures.
Check the roof for missing or damaged shingles and ensure gutters and downspouts are clear. Water intrusion from a roof leak or overflowing gutter is a common source of hidden mold. Seal any cracks in the foundation or around windows where rainwater could seep in. These proactive repairs stop the water that mold spores need to become active.
- Shut off the main water supply valve if you will be away for a long time.
- Drain your plumbing system by opening faucets at the highest and lowest points in the house.
- Consider installing water leak sensors that can alert you via a smartphone app.
- Have someone you trust check the interior of the home periodically for any issues.
- Ensure your sump pump, if you have one, is in good working order before a rainy season.
Promote Air Circulation and Ventilation
Stagnant, moist air encourages mold. Leave interior doors open to allow air to move freely throughout the house. If you have ceiling fans, set them to run on a low speed to keep air circulating. Do not completely seal vents; allow some airflow through your HVAC system's return and supply vents to prevent dead air pockets in rooms.
In areas prone to moisture, like bathrooms and the kitchen, use exhaust fans during your final clean-up to remove steam. Leave the doors to these rooms open after you finish. For closets and cabinets, especially those on exterior walls, leave the doors slightly ajar. This prevents musty odors and allows any residual dampness to dissipate rather than being trapped.
Clean and Declutter Thoroughly
Mold feeds on organic dust and debris. Give your home a deep clean before closing it. Vacuum and mop all floors, and wipe down hard surfaces. Pay special attention to kitchens and bathrooms, removing any food crumbs or soap scum. Clean out the refrigerator completely, leave the door propped open, and dispose of all perishable trash.
What to Do If You Find Mold Later
If you return to a closed home and discover mold, address the moisture source immediately. Mold growth means there is an active leak or a serious humidity problem. Fix the leak first, whether it is from a pipe, roof, or foundation. Then, assess the extent of the mold; small patches on hard surfaces may be cleaned with detergent and water.
For larger areas, porous materials, or if you smell a persistent musty odor, contact local water damage pros. They can perform a moisture mapping inspection to find all affected areas. They have the equipment for proper structural drying and dehumidification to get the space dry and prevent regrowth. Do not disturb extensive mold, as spores can spread through the air.
- Identify and stop the water source immediately to prevent further damage.
- Do not attempt to clean mold covering more than about ten square feet yourself.
- Porous materials like drywall or carpet with mold often need professional removal.
- Wear an N95 mask and gloves if you are cleaning a small affected area.
- A mold professional can test to identify the species if there are health concerns.
Talk to someone now
Phones are answered 24/7 for Oklahoma City and nearby communities.
Call Now (405) 565-9833Frequently asked questions
Should I leave the air conditioner on in a closed home?
Yes, it is wise to leave your AC on, set to a moderate temperature like 78 degrees. This helps control humidity, which is more critical for mold prevention than the temperature itself. If you turn it off completely, indoor humidity can rise rapidly, especially during humid seasons, creating perfect conditions for mold.
How often should someone check a closed home?
Have a trusted person check the interior at least once every two weeks. They should look for leaks, pest issues, and any signs of moisture or mold. They can also run faucets briefly if the water is on to keep seals in traps moist and verify the HVAC system is functioning.
Can I prevent mold after a leak in a vacant house?
Time is critical. If a leak occurs, you need emergency water extraction and structural drying started as soon as possible. Water left standing for more than 24 to 48 hours will almost certainly lead to mold. Contact local water damage pros immediately to dry the structure thoroughly.