Long-term RV storage in warm weather climates will require a few preparations that differ from winter storage. Humidity may pose a problem with increased condensation. High desert dryness can wreak havoc on plumbing seals. Insects and pests in all regions can become a warm weather storage nuisance. Because of these varying side effects of warm weather storage, the first line of defense is to perform a thorough inspection inside and outside of the parked vehicle at least one time per month.

Check with the local housing authorities or homeowner's association to learn the specific ordinances regarding long-term RV parking in your neighborhood. If you find it necessary to lease RV space at a local storage facility, select a location that is clean and adequately secured.

A covered site, even one with open sides, will best protect the RV from outside elements. However, storing the vehicle outdoors during hot weather months is easily managed with regular maintenance and inspection. Park the vehicle on a surface that is relatively level and firm and at all times free from standing water.

Thoroughly wash the exterior of the RV before putting the vehicle into storage.

In the event the RV is parked outdoors and exposed to the elements during hot weather storage, wash the surface on a monthly basis to remove dust and preserve the life of the clear coat. Empty and clean storage bays to promote airflow, particular the battery and water bays. Flush the sewer hose and allow the hose to completely dry before storing away.

Turn off all appliances. Cancel the automatic generator start program. Remove all food from cupboards and refrigerator, turn off the refrigerator, engage door latch to prop door slightly open. Reduce clutter around interior spaces, including closets and drawers, to enhance airflow in restricted spaces. Store the day/night shades in the up position. Cover all windows, including the cockpit window, with aluminum-insulated material that will protect interior fabrics and carpet from sun fading.

Interior airflow provides added protection against mold and mildew. Open the ceiling exhaust fans in the galley and bathroom. To prevent water intrusion through the ceiling vents from driving wind and rain, install temporary roof vent covers, available at most RV supply outlets.

Flush holding tanks and fill each tank to half with approved RV holding tank deodorizer. Fill the fresh water tank to 1/3 full and add one tablespoon of bleach to the fresh water system. Drive the RV a short distance to thoroughly mix the bleach into the fresh water supply. Fill the toilet bowl to half with water and close the lid. Run water in the sinks and shower to fill p-traps. Close drains in the galley and bathroom sinks and fill basins to half with water. Inspect all water levels every two weeks for evaporation and add more water as needed. Engage the water pump monthly to run water through the system. If you anticipate being away from the RV for a period longer than two weeks, use silicone spray to lubricate toilet seals (manual and electric).

Before placing the RV into storage, fully charge the batteries and fill cells in liquid lead acid batteries with distilled water. Disconnect the battery cut off switch at the batteries. Perform lubrication and inspection on the chassis and engine; replace belts and hoses that are cracked from wear. Store the vehicle with the fuel tank 95% full to leave room for expansion during hot weather temperatures. If the RV is plugged into shore power during storage, increase the battery maintenance schedule of liquid lead acid batteries to assure adequate water supplies in the individual cells.

Reduce cargo load as much as possible to minimize weight put upon the tires. Prior to storage, clean all tires using mild soap and water. Clean and polish wheels. Fill the tires to the recommended air pressure to guard against damage from long-term under-inflation. Protect tires exposed to direct sunlight by covering the sidewalls. Exercise the tires by driving short distances of no less than 20 miles every two months.

Thoroughly inspect the RV on a monthly basis. Add water to sinks and drain traps as needed, check water levels in liquid lead acid batteries. Start and run the RV engine using high idle to lubricate all moving parts. Engage the diesel generator for 30 minutes under a load of one roof air conditioner. Allow the generator a warm up time of three minutes before applying that load.

If you are considering the use of an RV cover during storage, acquire a quality made cover custom designed to fit the individual vehicle size. All-purpose covers can fall victim to disintegration from the heat of the sun, increase condensation build up during high humidity, and damage painted surfaces from excess fabric flapping during wind and rain. For optimum protection, purchase the RV cover through a specialty dealer or camping outlet that includes a product warranty. Insure that the fabric is breathable, provides adequate UV protection, and uses a color dye through all fibers, not just the surface layer. RV covers can also be purchased that offer a zippered doorway for easy access to the vehicle interior during storage. Covers are bulky to apply, and generally require at least two people for installation. Use caution when removing covers from around the RV roof components.