Preventing mold and moisture damage in an RV stored through a Florida summer.

Mold needs three things: moisture, something to feed on, and time. A stored RV in Florida supplies all three by default — humidity in the air, dust and fabric and paper inside, and a whole summer of undisturbed stillness. You cannot change the Florida air, but you can control how much moisture you seal in with the rig, whether new water gets in while you are gone, and how much air moves through the interior. Those three controls are the whole guide.

Leave it dry: the cleaning that matters most happens before storage

• Empty and clean the refrigerator, then prop the doors open. A closed fridge with any residue or moisture inside is the most reliable mold farm in the rig. Clean it, dry it fully, and leave the doors latched open with the prop or a towel so air circulates. Our refrigerator page covers the unit itself; for storage, dry and open is the rule.
• Remove food, paper, and damp-prone clutter. Pantry goods feed pests as well as mold. Cardboard, paper manuals, and stacked newspapers hold moisture against surfaces — take them out or store them off the floor in a sealed bin.
• Dry the wet zones deliberately. Wipe down the shower, run a fan or the AC long enough to dry the bathroom and under-sink cabinets, and leave cabinet and closet doors open so no pocket of damp air is sealed in the dark.
• Stand cushions and mattresses for airflow where you can. Foam and fabric pressed flat against a wall or base trap moisture at the contact surface. Tilting cushions up and leaving bedding off, or loosely folded, lets every surface breathe.
• Empty and rinse the holding tanks and drain low points as your maker directs. Standing grey water is an odor and growth source all summer. Follow your RV manual’s storage steps for the water system rather than a generic routine.

Keep new water out while you are gone

• Walk the roof and seals before you leave, not after you return. Most storage moisture is not humidity at all — it is a slow leak from a tired seam, a cracked sealant bead, or an AC gasket, dripping into a wall for months. The pre-season inspection in our roof and seal care guide is the same walk to do before storage.
• Check window and slide seals. Slide rooms left in or out should have their seals seated and intact; a folded or torn seal is a rain path aimed at the floor — the start of the damage described on our slide-out floor page.
• Close and latch everything, and confirm vents are covered. Roof vent covers let you leave a vent cracked for airflow without letting rain drive in — a common and sensible Florida storage setup where the storage location allows it.

Move the air, or absorb the moisture — ideally both

• If shore power is available and reliable, a small dehumidifier draining to a sink is the strongest option — set up so the drain cannot back up, and arranged so someone local can check on it if the power trips. A dehumidifier in a closed rig with a tripped breaker and a full bucket does nothing after the first days.
• Without power, use moisture absorbers sized for the space, and plan for them to fill. Hanging and tub-style absorbers help in cabinets, closets, and the main cabin, but they saturate. For a full summer, absorbers alone are a partial measure unless someone swaps them on a visit.
• Ventilation helps, within limits. Cracked vents with covers trade a little humid air for a little less humid air, which still beats a perfectly sealed box of damp air you left behind. The critical part is what you sealed in: a rig left truly dry tolerates Florida air far better than a rig left damp tolerates anything.
• Arrange a mid-summer check if anyone local can do it. A ten-minute visit — open the door, smell, glance at ceilings and absorbers, confirm power is on — catches a leak or a tripped breaker while it is still a small problem. In Leesburg and across the belt, moisture is the local mechanic precisely because it works undisturbed.

On your return: inspect before you settle in

• Trust your nose first, then look where water would hide: ceiling corners, inside overhead cabinets, under sinks, around windows, and along slide floors. Soft flooring or a musty cabinet is a finding to chase, not to air out and ignore.
• Run the systems in the arrival order — water, power, AC, slides, appliances — as laid out in the snowbird arrival checklist. Running the AC helps dry the interior once you have confirmed there is no active leak feeding it.
• Surface mildew on hard surfaces is a cleaning job; growth inside walls, under flooring, or in ducting is not. If you find widespread growth, soft structure, or a leak source you cannot identify, that is when to bring in help — a mobile tech can find and fix the water source, which is the part that stops it coming back.

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By Josh Tomlinson — Josh operates Florida Mobile RV Service and writes these guides. About the service →

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