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Dockside boat and yacht AC

Marine AC repair in Miami, FL

Boat air conditioning lives in salt water and constant humidity. When the cabin turns hot and sticky, the problem is usually the seawater side, and it needs someone who knows how these systems work.

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We repair and install Carrier, Trane, Lennox, Daikin, Mitsubishi Electric and every other major brand found in Miami homes.

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Quick answer

Marine AC repair covers the self-contained and split air conditioning units on boats and yachts. Most marine systems reject heat into seawater, so clogged strainers, failing seawater pumps and fouled condenser coils cause most breakdowns. We service boats dockside at Miami marinas, diagnose the fault and repair it.

Written by Sylvia Denton, HVAC Guides Editor. Updated 2026-09-22.

Most boat air conditioners are water-cooled. A seawater pump pulls water through a strainer and a condenser coil, carrying heat overboard. If that flow drops, the unit trips on high pressure and stops cooling.

Miami's warm water grows marine growth fast, and salt corrodes pumps, fittings and electrical connections. Barnacles in through-hulls, sea grass in strainers and scale in condenser coils are the usual suspects.

We work on boats at slips and marinas around Miami, including Miami Beach, Coconut Grove and the Miami River, and handle both the seawater side and the refrigeration side.

Water-source heat pump unit in a Miami high-rise condo closet with supply and return water hoses
Process

How a dockside marine AC repair works

  1. 1

    Check seawater flow

    Strainer, through-hull and overboard discharge checked.

  2. 2

    Test the pump

    Seawater pump output and electrical supply tested.

  3. 3

    Inspect the condenser

    Condenser coil checked for scale and growth.

  4. 4

    Check refrigeration

    Pressures and operation verified.

  5. 5

    Clean and test

    System flushed or repaired, then run to temperature.

Pricing

What marine AC repair costs in Miami

$195 to $395Dockside diagnosis

Includes basic flow checks.

$450 to $1,200Seawater pump replacement

Depends on pump and access.

$295 to $695Condenser coil acid flush

Removes scale and growth.

$550 to $1,800Refrigerant leak repair

Depends on unit size.

$2,200 to $6,500Self-contained unit replacement

Per unit, installed.

Typical 2026 Miami-Dade ranges, not a quote. Vessel size and access affect pricing.

Local context

Marine air conditioning around Miami

Miami has one of the largest recreational boating communities in the country, with marinas from Miami Beach and Key Biscayne to Coconut Grove and the Miami River.

Warm, nutrient-rich water fouls strainers and condenser coils quickly, so marine AC needs regular cleaning in a way home systems do not.

Many boats sit with AC running to control humidity and mildew, which keeps seawater pumps working hard.

Close detail photo for water-source heat pump service in a Miami property: technicians hands at the service step

Where we handle this service

See every Miami-Dade community we cover
Benefits

What marine AC service fixes

  • Cool, dry cabins again
  • Steady seawater flow through the condenser
  • Fewer high-pressure trips
  • Less corrosion on pumps and fittings
  • Better sleep aboard on hot nights
FAQ

Marine AC questions

Why does my boat AC shut off after a few minutes?

Usually low seawater flow from a clogged strainer or a weak pump, which causes a high-pressure trip.

How often should a boat AC condenser be flushed?

Every one to two years in Miami waters, or sooner if cooling drops.

Do you come to the marina?

Yes. We work dockside at marinas around Miami.

Can running the AC prevent mildew on my boat?

Yes. Controlled cooling and dehumidification reduce mildew in cabins.

What should I check before calling about boat AC?

Look at the seawater strainer and confirm water is coming out of the overboard discharge.

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Cabin hot and the AC tripping?

Call for dockside marine AC repair around Miami.

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