Why is my boat's AC not blowing cold air?

The #1 cause in Southwest Florida is calcium scale buildup in the condenser and raw water system from warm saltwater. Other common causes: clogged raw water strainer (sea grass, barnacles, jellyfish), failed seawater pump impeller, low refrigerant from a leak, faulty thermostat, or a failing compressor. We see boats go from 'barely cooling' to 'ice cold' after a professional descaling flush. If your system hasn't been flushed in 12+ months, that's where we start. Call 239-323-9600 for a diagnostic.

What causes high-pressure lockouts on marine AC systems?

High-pressure lockouts mean restricted water flow through the condenser. In SWFL's warm, mineral-rich saltwater, the #1 culprit is calcium scale deposits inside the heat exchanger. Other causes: clogged sea strainer (barnacles, sea grass, jellyfish), worn raw water pump impeller losing flow, air lock in the seawater line, or a blocked thru-hull. A professional descaling flush and strainer cleaning resolves most cases. If the system has been neglected 2+ years, the condenser may need replacement. We carry Accumar Descaling Solution and flush on-site at your dock.

How often do I need a marine AC flush in Florida saltwater?

In Southwest Florida's warm saltwater, flush your marine AC system at least once per year — ideally in early spring before peak cooling season (March–April). Boats that run AC year-round (liveaboards, frequent users) need twice-yearly flushes. Scale buildup from calcium deposits is the #1 cause of AC failure in this region. A single flush can take a system from 'barely working' to 'ice cold' and extend its life by 5–10 years. We use Accumar Descaling Solution, purpose-built for marine heat exchangers.

How much does marine air conditioning repair cost in Fort Myers?

Marine AC repair costs depend on the system, vessel access, and scope of work. A basic diagnostic and strainer cleaning is on the lower end; a compressor replacement or full system overhaul costs more. We start every job with a thorough diagnostic to identify the root cause, then provide a clear written estimate before any work begins. No surprises. Call 239-323-9600 for a free phone consultation.

Is it cheaper to repair or replace my marine air conditioner?

Rule of thumb: if the repair exceeds 50% of a new system's cost, or if the unit is 12+ years old with recurring issues, replacement is the better investment. Modern marine AC systems (Dometic, Webasto) are more efficient, quieter, and use environmentally compliant refrigerants. We provide honest assessments — we won't push a replacement if a $300 flush or repair gives you another 5 years of reliable cooling. We've saved customers thousands by diagnosing the real problem instead of selling a new unit.

What brands of marine air conditioning do you service?

We service all major marine AC brands: Dometic (formerly Cruisair), Webasto, Marine Air, Mermaid, Flagship, Condaria, Marinaire, Velair, Carrier, and custom installations. Our technicians are factory-trained on Dometic and Webasto systems. We carry common parts on our service truck for same-day repairs when possible.

My boat AC smells musty — is that mold?

Yes, almost certainly. In Florida's humidity, mold and mildew grow rapidly in marine AC ducting, evaporator coils, and drain pans. Musty smell = biological growth in the air handler. We clean and treat the evaporator coil, flush the condensate drain, and can install UV treatment to prevent regrowth. Left untreated, mold affects air quality and can cause health issues — especially for liveaboards. This is one of the most common complaints we get in SWFL.

Do you offer emergency marine AC repair on weekends?

Yes. A broken AC on a boat in Florida is a genuine emergency — cabin temperatures can exceed 120°F, risking heat stroke and damaging electronics, wood, and upholstery. We offer emergency and after-hours marine AC repair throughout Southwest Florida. Call 239-323-9600 anytime. Emergency rate is $220/hr (vs. $160/hr standard).

Can you install a new marine AC system on my boat?

Absolutely. We design and install complete marine air conditioning systems for boats of all sizes — from 25-foot cabin cruisers to 100+ foot yachts. We work with Dometic, Webasto, Marine Air, and other leading brands to find the right BTU capacity for your vessel. Installation includes proper ducting, seawater plumbing, electrical connections, and commissioning. See our AC System Builder tool or call for a free on-board survey.

How often should I have my boat's AC system serviced?

Annual maintenance minimum — including a full system inspection, refrigerant level check, raw water system flush, strainer cleaning, and impeller inspection. In Southwest Florida's warm saltwater, scale buildup is the #1 cause of AC failure. Our maintenance program customers get priority scheduling, 15% off repairs, and no emergency fees. Regular maintenance can extend your system's life by 5–10 years and prevent the $2K–$5K emergency repair bills we see from neglected systems.

Why does my marine AC keep tripping the breaker?

Common causes: compressor drawing excessive amps (often from restricted water flow or low refrigerant), corroded shore power connections, undersized wiring, or a failing capacitor. In SWFL, the most frequent cause is a compressor working too hard because of scale-restricted water flow — the system overheats and trips the breaker as a safety measure. A flush and electrical inspection usually resolves it. If the compressor is drawing locked-rotor amps, it may need replacement.

What size marine AC do I need for my boat?

General rule: 1,000 BTU per linear foot of boat in Southwest Florida's heat. A 35-foot boat typically needs 16,000–24,000 BTU depending on insulation, window area, and sun exposure. Flybridge boats and vessels with large salon windows need more capacity. We do on-board heat load calculations to size the system correctly — oversizing wastes energy, undersizing means the system runs constantly and never reaches temperature. Use our AC System Builder tool or call for a free survey.

I'm a liveaboard in Fort Myers — how do I keep my AC running reliably?

Liveaboards in SWFL run AC 8–12 months a year, which means 2–3x the wear of seasonal boaters. We recommend: (1) twice-yearly descaling flushes (spring and fall), (2) monthly strainer checks, (3) annual impeller replacement, (4) a maintenance program for priority scheduling and discounted rates. Most AC failures we see on liveaboard vessels are from deferred maintenance — scale buildup that could have been prevented with a $200 flush turns into a $3,000 compressor replacement.

What is the difference between self-contained and split marine AC systems?

Self-contained units house the compressor, evaporator, and controls in one box — easier to install, good for smaller boats. Split systems separate the compressor (in the engine room or bilge) from the air handler (in the cabin) — quieter operation, better for larger vessels with multiple zones. Chilled water systems use a central chiller to cool water that circulates to air handlers throughout the boat — the most efficient option for yachts over 50 feet. We install and service all three types.

ACCUMARMarine Services

239-323-9600

HomeMarine Air Conditioning

Marine Air Conditioning Repair & Installation

Expert marine air conditioning repair, installation, troubleshooting, and AC flush service in Fort Myers, Cape Coral, Naples, and all of Southwest Florida. EPA 608 certified technicians with 25+ years of experience servicing all major marine AC brands. Mobile service delivered to your dock.

Call 239-323-9600

Marine AC Services We Provide

From routine maintenance to emergency repairs, we handle every aspect of marine air conditioning for boats and yachts throughout Southwest Florida.

Marine AC Repair

Diagnose and repair all marine air conditioning issues — compressor failures, refrigerant leaks, fan motors, thermostats, control boards, and electrical faults. All brands serviced.

Marine AC Installation

New marine AC system design and installation for boats of all sizes. Proper BTU sizing, ducting, seawater plumbing, and electrical connections. Dometic, Webasto & more.

Learn more

AC Troubleshooting

Comprehensive diagnostic service to identify why your boat's AC isn't cooling. Pressure testing, refrigerant analysis, airflow measurement, and seawater flow verification.

AC Flush & Maintenance

Remove scale buildup from heat exchangers and condensers with professional-grade flushing. Restores cooling capacity and prevents premature system failure.

AC Maintenance

Annual marine AC maintenance including full system inspection, refrigerant check, strainer cleaning, impeller inspection, and performance testing.

AC Sales & Upgrades

New marine AC units from Dometic, Webasto, Marine Air, and other leading brands. We help you choose the right system and handle complete installation.

Why Regular AC Flushing Is Critical

South Florida saltwater doesn't forgive neglect. Here's what we pull out of marine AC strainers.

BEFORE — Barnacle & Scale Buildup

AFTER — Professional Flush

Actual raw water strainer from a boat in Fort Myers. Barnacles and calcium scale choke water flow, killing cooling performance. A professional flush restores full capacity.

Schedule a Flush

Marine AC Brands We Service

DometicWebastoMarine AirCruisairMarinaireMermaidFlagshipCondariaVelairCarrierMitsubishi

Florida Heat Is Coming — Is Your Boat AC Ready?

Every spring, we get flooded with emergency calls from boat owners whose AC failed on the first hot day. Cabin temperatures on a boat in direct sun can exceed 130°F in Southwest Florida.

Don't wait until it's 95°F to find out your system is clogged with scale.

Liveaboards

You run AC 10\u201312 months/year. A $200 spring flush prevents a $3,000 compressor failure in July.

Seasonal Boaters

Systems that sat idle all winter need flushing before first use. Stagnant saltwater accelerates scale buildup.

Charter / Rental

AC failure = unhappy customers and lost revenue. Pre-season maintenance is a business expense, not optional.

Schedule Spring AC Flush

5 Signs Your Boat AC Needs Service Now

If you notice any of these, call before it becomes an emergency.

Warm air or reduced cooling

Schedule within 1 week

The system runs but cabin temperature won't drop below 80°F. Usually scale buildup restricting water flow through the condenser. A flush often fixes this same day.

System cycles on and off rapidly (short-cycling)

Schedule within 3 days

High-pressure safety switch is tripping. The condenser can't reject heat fast enough — typically from scale, a failing impeller, or low refrigerant. Left unchecked, this kills the compressor.

Water flow from overboard discharge has slowed

Schedule within 1 week

Reduced seawater flow = the system is choking. Scale in the heat exchanger, worn impeller, or clogged strainer. This is the early warning — fix it now before the compressor overheats.

Musty or moldy smell from vents

Schedule within 2 weeks

Biological growth in the evaporator coil and ducting. Common in Florida humidity. Affects air quality and can cause respiratory issues. We clean, treat, and can install UV prevention.

Breaker trips when AC starts

Call today

Compressor drawing excessive amps — often from restricted water flow causing overheating, or a failing start capacitor. Could also be corroded shore power connections. Needs immediate diagnosis.

Call for a Diagnostic \u2014 239-323-9600

Common Questions

Marine AC Questions \u2014 Southwest Florida

Service Area

Marine AC Service Areas in Southwest Florida

Mobile marine air conditioning repair delivered to your dock, marina, or boatyard. Based in Fort Myers, we service vessels from Marco Island to Port Charlotte and everywhere in between.

Call for Service

⚓ 46 marinas served|Fort MyersCape CoralNaplesMarco IslandSanibelPort CharlotteBonita SpringsPunta GordaSarasota

Need Marine AC Repair in Southwest Florida?

Don't suffer in the Florida heat. Call Accumar Marine Services for fast, professional marine air conditioning repair delivered to your dock.

EPA 608 Certified \u2022 25+ Years Experience \u2022 Same-Day Service Available \u2022 All Brands

Call 239-323-9600

AC Repair Landing Page Maintenance Programs AC Installation AC System Builder Boat AC Not Cooling?Emergency AC Repair AC Flush & Descaling Pricing & Rates

Prevent A/C Breakdowns Before They Happen

Our A/C Maintenance Program keeps your marine air conditioning running — $140/visit with guaranteed working A/C when you arrive at your boat.

Captain's Maintenance Bulletin

Seasonal checklists, diagnostic tips, and marine AC insights from 25+ years in the field. No fluff — just what works.