What Sitting Idle in Montgomery County Does to Your RV, and the Checklist That Prevents Most of It

September 23, 2026

A lot of the RVs we service in Montgomery County do not travel constantly. They sit for weeks or months at a time, on a dock pedestal at a Lake Conroe house, in a gated boat-and-RV storage yard, or on a rural property, between weekend trips, hunting season, or a lake-season stretch of real use. Every one of those idle months works on the rig the same way, and most of what it does is preventable at little or no cost.

Mold, first and worst

A closed-up RV in Montgomery County’s muggy season, which runs from roughly mid-April into late October, sits in humid air every night with no air moving inside. Every soft surface, the mattress, the upholstery, the inside of cabinets, the evaporator coil and ducts of the rooftop AC, is a candidate for mildew growth over weeks of no airflow. The musty smell out of the AC on the first start after a long sit is the coil telling you what happened while you were gone.

Before a long sit: crack the roof vents under vent covers so rain cannot get in but air can move. Prop the fridge and freezer doors open. Leave cabinet doors ajar and the shower door open. Put moisture absorbers in every closed space. If the rig stays on power, a small dehumidifier draining into the shower is the single best thing you can run. Strip the bed and take the linens home if you can. Wipe down every surface with a mildew-inhibiting cleaner before you go.

Sealant, under sun and then rain

The lap sealant around every roof penetration (vents, skylights, the AC gasket, antennas, the fridge vent, front and rear seams) relies on plasticizers to stay flexible, and Texas sun bakes them out. A joint that cracks in spring sun gets tested by the wet months that follow, and by hurricane season on top of that. Water follows the crack into the decking and stays there through the muggy season, so a leak that started small in April can be a ceiling stain and wet wood by the time you check on the rig again.

Before a long sit: walk the roof, or have it walked with a camera. Dig out and redo anything cracked, chalky, or lifted while it can still cure in a dry window. A reseal is $500 to $1,200; wet decking is $2,000 to $3,000 and up. The roof calculator prices both. Take photos of every joint so you have a baseline if a storm comes through while the rig sits.

Batteries, cooking slowly

Heat accelerates self-discharge, and a lead-acid bank that self-discharges to flat and sits there sulfates. A bank that was fine when the rig went into storage comes back weeks or months later unable to hold a charge, and then it impersonates slide, jack, and appliance failures until someone puts a meter on it. See the batteries dead or not charging problem page for the check.

Before a long sit: either disconnect the batteries entirely (pull the negative, or use the disconnect switch, and know that some parasitic draws bypass it) or leave them on a proper maintainer, behind a surge protector. Top off flooded batteries with distilled water first. Do not leave a bank half-charged and connected; that is the worst of both.

The fridge, off and open

An absorption fridge left running in a closed rig through hot weather with nobody checking on it is working near the edge of its design all season. Left off and closed, it grows mold instead. The answer between trips is off, defrosted, dried, and propped open. If it needs to keep running because someone visits the rig occasionally, the refrigerator page covers vent fans and level, which do more for summer performance than any part swap.

Fuel, drawing water

Ethanol gasoline is not a storage fluid, and in humid air it is worse than in dry air: ethanol draws moisture, corrodes aluminum from the inside, and leaves varnish in the carburetor jets as the light fractions evaporate. A generator that ran fine on its last trip and cranks without firing on the next one is almost always this, and it is a $350 to $800 carburetor job.

Before a long sit: add stabilizer to the tank and run the generator long enough to get treated fuel through the carburetor, then shut off the fuel and run the bowl dry if your unit allows it. A monthly run under real load, if someone can get to the rig, beats everything else on this list.

Pests, moving in

Wasps and other insects are drawn to the odorant added to propane and will pack the burner tubes of the water heater and furnace solid over a long idle stretch. The “water heater will not light” call after a long sit is very often a nest and a corroded thermocouple, a $150 to $450 fix rather than a replacement, but it is also entirely preventable.

Before a long sit: cover the water heater and furnace exhaust openings with screens made for the purpose. Empty cabinets of food. Seal any opening in the underbelly you can find.

And then hurricane season, layered on top

If the rig’s idle stretch overlaps June through November, hurricane season is happening at the same time. Awnings in and locked, slides in where the rig allows it, antennas and dishes down, vent covers on, loose items off the site. We cover the full prep list and post-storm inspection order in its own post.

The short version

1. Roof walked and resealed in a dry window; photos taken.
2. Vents cracked under covers; fridge and cabinets propped open; moisture absorbers or a dehumidifier running.
3. Batteries disconnected, or on a maintainer behind a surge protector; flooded cells topped off.
4. Fuel stabilized, generator run, bowl dry.
5. Burner tubes screened; food out; underbelly sealed.
6. Shore power off, or through a surge protector.
7. If hurricane season overlaps the sit: awnings, slides, antennas, and loose items secured.
8. Someone who can check the rig periodically, and our number on hand if something turns up.

Do that before a long sit and the pre-trip checkout gets a lot shorter. Everything we charge for is on the pricing page, and most of what is on this page we would rather you never need us for.