RV AC & Cooling Repair in Sebastian

Florida's combination of high heat and high humidity puts RV air conditioning systems under extreme stress. In Sebastian, summer temperatures regularly exceed 95 degrees with 80 to 90 percent humidity. Your RV AC is not just cooling the air, it is also removing moisture. A residential home has thick insulation, double-pane windows, and a properly sized central system. An RV has thin walls, single-pane windows, and a compact rooftop unit doing the work of a much larger system. That is why RV AC failures spike every May through October here in Indian River County.

If your RV has two rooftop AC units and you are in Florida during summer, run both. A single 13,500 BTU unit can handle about 300 to 350 square feet in moderate conditions. But when the outside temperature exceeds 95 degrees and humidity is above 80 percent, that same unit struggles to maintain comfortable temps in a 35-foot fifth wheel. Two units working together cool faster, run less aggressively, and last longer because neither one is maxed out all day. If you only have one unit and your rig is over 30 feet, consider adding a second or upgrading to 15,000 BTU.

A soft-start kit reduces the startup surge of your RV air conditioner from about 40 to 70 amps down to 20 to 30 amps. This matters for two reasons. First, if you are on a 30-amp shore power connection and want to run your AC plus other appliances, a soft-start prevents the breaker from tripping every time the compressor kicks on. Second, if you are running off a generator or inverter with a battery bank, the reduced surge means you can start the AC on smaller power sources. Installation takes about an hour and costs $200 to $350. For Florida RV owners, it is one of the best upgrades available.

The most common cause is a failed run capacitor. The compressor needs a capacitor to start and run, and Florida heat degrades capacitors faster than cooler climates. A replacement costs $95 to $175 and takes about 30 minutes. Other causes include low refrigerant from a slow leak, a dirty condenser coil blocking airflow, a frozen evaporator coil from a dirty filter, or a failed compressor. We test amperage, capacitance, and refrigerant pressure to identify the exact cause before quoting a repair.

Yes, and it is very common in Florida RVs. The combination of cool air flowing through ducts and warm, humid air outside creates condensation inside the duct system. That moisture, combined with dust and organic particles, creates an ideal environment for mold and mildew. Symptoms include a musty smell when the AC kicks on, visible dark spots around ceiling vents, and allergy-like reactions inside the RV. We clean ductwork using mechanical brushing and antimicrobial treatment. A full cleaning costs $125 to $350 and should be done annually in Florida.

Start with the basics. Clean or replace the return air filter every 30 days during summer. Park in shade when possible. Use reflective windshield and window covers to block solar heat gain. Make sure your roof vent covers are not blocking airflow to the AC unit. Check the rubber gasket between the rooftop unit and the roof for gaps that let hot air in. On the maintenance side, have the condenser coil cleaned once a year, check for ice buildup on the evaporator coil, and verify the thermostat is reading accurately. These steps can improve cooling output by 15 to 20 percent without spending a dollar on parts.

In Florida's heat and humidity, expect 6 to 10 years from a rooftop RV air conditioner with proper maintenance. That is shorter than the 10 to 15 years you might get up north because the unit runs 8 to 12 hours a day for 6 or more months of the year. Regular maintenance, including annual coil cleaning, capacitor checks, and filter changes, pushes you toward the 10-year end. Neglecting maintenance drops you closer to 5 or 6 years. When it is time to replace, budget $800 to $1,800 for the unit and installation.

A complete RV rooftop AC replacement, including the unit, ceiling assembly, gasket, and installation, runs $800 to $1,800. A standard 13,500 BTU unit like a Dometic Brisk II or Coleman Mach falls in the $800 to $1,200 range installed. A 15,000 BTU unit with a heat pump option runs $1,200 to $1,800. Installation takes 2 to 4 hours and includes removing the old unit, cleaning and resealing the mounting area, placing the new unit, and wiring it to the existing thermostat and power supply. We test under load before we leave.