How to Prep Your RV Air Conditioner for Brutal Texas Summer Heat

Spring in Montgomery County is brief. Before we know it, temperatures in Conroe, Willis, and The Woodlands will climb into the nineties and triple digits, bringing heavy Southeast Texas humidity with them. If your RV has been sitting idle over the cooler months, or if you are planning regular weekend trips to Lake Conroe, your air conditioner is about to face its toughest test of the year.

RV air conditioning units work much harder than residential systems because RVs have thinner walls and less insulation. Taking some time now to inspect and service your air conditioner can save you from a hot, miserable weekend waiting on a repair when the season peaks. Here is a practical guide to getting your RV AC ready for the heat.

Clearing Out the East Texas Pine Pollen

Our local loblolly pines drop a massive amount of yellow pollen every spring. While it is an obvious nuisance on your tow vehicle's windshield, it can be quietly destructive to your RV's air conditioner.

The outdoor condenser coils, located under the plastic shroud on your RV roof, act like a magnet for pollen, dust, and organic debris. When these coils get caked in grime, the unit cannot shed heat efficiently. This forces the compressor to run hotter and draw more amps, which eventually leads to premature failure.

To clean them, the plastic shroud needs to come off. Use a soft brush or a specialized aerosol coil cleaner to wash away the dirt from the aluminum fins. Be careful not to bend the delicate fins, and never use a high-pressure power washer, which can flatten them completely and block airflow permanently.

Testing Your AC's Temperature Drop

Before the deep summer heat sets in, you should run a simple diagnostic test on your air conditioner to see if it is operating within its normal parameters. This is called testing the "Delta-T," or the temperature differential.

Turn your AC on high cool and let it run for about fifteen to twenty minutes with the RV doors and windows closed. Using a digital thermometer, measure the temperature of the air entering the return vent where the filter is located. Next, measure the temperature of the cold air coming directly out of the closest discharge vent.

A healthy RV air conditioner should show a temperature drop of 16 to 22 degrees Fahrenheit. If your drop is less than 15 degrees, your unit is struggling. This could be due to dirty coils, a failing compressor, a refrigerant leak, or an internal air leak where cold output air is mixing with warm return air inside the plenum.

Addressing Low Voltage at Local Campgrounds

During peak summer weekends, campgrounds around Lake Conroe and Huntsville get crowded. When dozens of RVs are all running their air conditioners at once, the park’s electrical grid can experience voltage drops. Running your AC on low voltage (anything below 108 volts) is incredibly hard on the compressor motor.

If your compressor struggles to kick on, or if you notice your cabin lights dimming significantly when it starts up, your run and start capacitors may be weak. Replacing weak capacitors is a simple, preventive step that keeps the compressor from overheating.

You might also consider installing a soft start device. A soft start reduces the initial startup amp draw by up to 70 percent, which protects your compressor and allows you to run your AC more easily on smaller generators or 30-amp campground pedestals without tripping breakers.

Checking the Inside Air Filter and Plenum

Inside the cabin, the solution to poor cooling is often the simplest one: the air filter. A clogged filter restricts airflow, which can cause the indoor evaporator coils to freeze over into a solid block of ice, shutting down all cooling. Clean or replace your filter at least once a month during the heavy cooling season.

While you have the filter cover off, look up into the plenum. Manufacturers often use duct tape to seal the divider wall between the cold air discharge side and the warm return air side. Over time, traveling down bumpy stretches of I-45 or local backroads can loosen this tape. If that divider leaks, your cold air will short-circuit right back into the intake, drastically reducing the unit's cooling efficiency inside the coach.

If you do not feel comfortable climbing onto your RV roof to clean coils, or if your AC is not pulling down the temperature like it should, let me take a look. I am Jason, and I run RV Paramedic. I drive a converted ambulance stocked with parts and diagnostic tools, and I can come directly to your home, storage lot, or campsite in Montgomery, Conroe, Willis, Magnolia, or Spring to get your climate control system running reliably.

To schedule an AC inspection or repair, call RV Paramedic at (936) 727-3066.