What a Florida Summer Does to a Parked RV, and the April Checklist That Prevents Most of It

September 21, 2026

The rig that leaves a Zephyrhills park lot in April and comes back in November has spent the six hardest months of its year without you. Summers here are long, hot, and wet: August averages 90 degrees, July drops more than six inches of rain, and from May into November the air is muggy nearly every day, with dew points in the high 60s and 70s and humidity above 90 percent at night, falling to 60 percent or less on the afternoons. That is the air your rig sits in, inside and out, for half the year.

This is what that air does, system by system, and the checklist for owners leaving in April that prevents most of it. Nothing on it costs much. Most of it costs nothing.

Mold, first and worst

A closed-up RV in a Florida summer is a terrarium. Every soft surface, the mattress, the upholstery, the inside of cabinets, the evaporator coil and the ducts of the rooftop AC, sits at 90 percent humidity every night with no air moving. By August there is mildew on all of it, and the musty smell out of the AC on the first November start is the coil telling you.

Before you leave: 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 and replace them if someone can check on the rig midsummer. 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. Wipe down every surface with a mildew-inhibiting cleaner the day 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 the spring sun bakes them out. In a dry climate that crack would sit harmless for months. Here the rainy season arrives within weeks, and an afternoon downpour finds every joint that opened. Water follows the crack into the decking and stays there, because nothing dries out in this air. By November there is a stain on the ceiling and wet wood above it.

Before you leave: walk the roof, or have it walked with a camera. Dig out and redo anything cracked, chalky, or lifted, in the dry spring while it can cure. 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.

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 in April comes back in November unable to hold a charge, and then it impersonates slide, jack, and appliance failures until someone puts a meter on it.

Before you leave: 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 a Florida summer is working at the edge of its design all season with nobody to notice when it loses ground. Left off and closed, it grows mold. The answer is off, defrosted, dried, and propped open. If you must leave it running because someone is using the rig occasionally, the fridge page covers vent fans and shade, which are the difference between a fridge that copes with August and one that does not.

Fuel, drawing water

Ethanol gasoline is not a storage fluid, and in humid air it is worse than in dry air: ethanol draws moisture, and the mix corrodes aluminum from the inside while the light fractions evaporate and leave varnish in the carburetor jets. A generator that ran in April and cranks without firing in November is that, almost every time, and it is a $350 to $800 carburetor job.

Before you leave: 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. If someone can visit the rig, the two-hours-a-month run under load beats everything else on this page.

Tires, aging in the sun

Sun and heat dry-rot tires from the outside while time works from within, and a summer parked here ages sidewalls visibly. Cover them. Park on boards rather than bare ground if the lot allows it. Inflate to the sidewall maximum before you leave, because a tire that sits soft in heat flexes and cracks at the bead. Check every sidewall for cracking before the rig moves in November, regardless of tread depth.

Pests, moving in

Wasps and mud daubers are drawn to the odorant in propane and will pack the burner tubes of the water heater and furnace solid over a summer. Ants and other pests follow any food left behind. The November “water heater will not light” call is very often a nest, and it is a $150 to $450 cleaning and small-part job rather than a replacement, but it is also entirely preventable.

Before you leave: cover the water heater and furnace exhaust openings with screens made for the purpose. Empty every cabinet of food. Seal any opening in the underbelly you can find.

Lightning, through the pedestal

This corridor between Tampa and Orlando carries more lightning than anywhere else in the country; Florida led the nation in 2025 at 305 lightning events per square mile. A strike does not have to hit the rig. A strike near the park puts a surge through the pedestal and into every rig plugged into it, and the converter, the AC control board, and the fridge board go together. Summer is peak season for it, and the owner finds out in November.

Before you leave: unplug the rig from shore power entirely if you can. If you need power for a maintainer or a dehumidifier, put a hardwired surge protector rated for RV use between the pedestal and the rig and accept that it is sacrificial. The 12V page covers what a dead converter looks like when you get back.

And then hurricane season

Hurricane season runs June 1 to November 30, peaking around September 10, which means the whole time you are gone. Awnings in and locked, slides in where the rig allows it, antennas and dishes down, vent covers on, loose items off the roof and out of the site. Have a plan for who checks the rig after a named storm and who calls us for the post-storm inspection; we cover that in its own post.

The short version, for the fridge door

1. Roof walked and resealed in the dry spring; photos taken.
2. Vents cracked under covers; fridge and cabinets propped open; moisture absorbers or a dehumidifier; linens home.
3. Batteries disconnected, or on a maintainer behind a surge protector; flooded cells topped off.
4. Fuel stabilized, generator run, bowl dry.
5. Tires covered and inflated; rig on boards.
6. Burner tubes screened; food out; underbelly sealed.
7. Shore power off, or through a surge protector.
8. Awnings, slides, antennas, and loose items secured for storm season.
9. Someone who can check the rig after a storm, and our number on their fridge.

Do that in April and the November arrival checklist 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.