Indian River County · North Treasure Coast

AC Repair & HVAC Installation in Sebastian, FL

Maritime Air Co. serves Sebastian homeowners and boaters with coastal-grade HVAC installations and a dedicated marine division. From the Sebastian Inlet to Roseland, one trusted family-owned crew.

(772) 236-4277 Schedule Service

License # CAC1824400 5.0 · 37 Google Reviews ZIPs: 32958, 32976

Why Treasure Coast Trusts Us

Reasons Homeowners & Captains Pick Maritime Air Co.

5-Star Rated
Verified Google reviews
Licensed & Insured
Class-A CAC1824400
Family Owned & Operated
Treasure Coast residents
Residential · Commercial · Marine
Full-spectrum HVAC
Written Estimates
Approved before work begins
Photo-Documented Work
Warranties registered for you
Chamber of Commerce
St. Lucie County member

Sebastian HVAC Services

Trusted Air Conditioning Services for Sebastian Homeowners

AC Repair in Sebastian

Same-day diagnostics for failed compressors, refrigerant leaks, frozen coils, and thermostat issues.

AC Installation in Sebastian

Right-sized, energy-efficient systems engineered for Florida humidity and salt-air corrosion.

Duct Cleaning in Sebastian

Remove dust, pollen, pet dander and mold for healthier indoor air across coastal homes.

Maintenance Plans in Sebastian

Captain's Comfort Club — twice-a-year tune-ups, priority dispatch, and warranty-keeping service.

Local Climate

What Sebastian's Climate Means for Your HVAC

Sebastian sits in USDA zone 10a with a humid subtropical climate. Summer dewpoints regularly exceed 75°F from June through September, our AC systems run 12–16 hours per day, and August indoor latent loads can double a home's design moisture removal requirement. Homes within 3 miles of the Atlantic or Indian River Lagoon also face chloride-laden salt air that destroys uncoated aluminum condenser coils in 5–8 years. Equipment selection, coil coatings, and dehumidification strategy in Sebastian are not the same as inland Florida — and they shouldn't be priced or installed the same way either.

Common HVAC Issues

The Most Common HVAC Problems We See in Sebastian

After thousands of service calls across the Treasure Coast, these are the failures we diagnose week after week in Sebastian homes. If any of them sound familiar, call us before they turn into a compressor or coil replacement.

Frozen evaporator coils

Florida humidity overworks under-maintained systems — a common Sebastian call. We diagnose airflow restrictions, dirty filters, and low-charge issues that cause icing.

Compressor failures from voltage spikes

Summer storms and FPL surges destroy compressors across Sebastian. We install whole-system surge protectors and source warranty-replacement Trane, Carrier, and Goodman scroll compressors fast.

Refrigerant leaks at coil joints

Salt air corrodes aluminum coil fins on homes east of US-1. We pressure-test with nitrogen, electronically leak-detect, and re-braze or replace coils with coastal-grade Heresite-coated alternatives.

Sky-high humidity (60%+ indoor RH)

Oversized or single-stage systems short-cycle and never pull moisture out. We right-size with Manual J, install variable-speed equipment, and add dedicated dehumidification when needed.

Mold and mildew on supply registers

Standing condensation, dirty blower wheels, and biofilm in the drain pan all show up as black streaks on ceilings. We sanitize coils, replace drain pans, and add UV-C lights.

Sudden FPL bill spikes

A failing capacitor, dirty condenser coil, or partial duct collapse can quietly add $80–$150/month. Our $89 tune-up catches all three before they snowball.

Local Expertise

Why Sebastian Homes Need a Coastal HVAC Specialist

Sebastian Inlet salt air

Among the harshest salt-air microclimates in Florida. Coastal coatings are mandatory; standard equipment fails in 5–7 years.

Long service drives demand right-first-time

Sebastian is at the north end of our radius. We come with parts, refrigerant, and the right diagnostic equipment to finish on the first visit.

Sebastian River brackish humidity

Year-round high RH means dehumidification and variable-speed equipment dramatically outperform single-stage installs.

Neighborhoods We Serve in Sebastian

Sebastian Highlands
Roseland
Micco
Sebastian Inlet
Wabasso
Pelican Island area
Sebastian River waterfront

Call (772) 236-4277 Schedule Service

Marine HVAC in Sebastian

Dockside Marine Air Conditioning Service for Sebastian Boaters

Serving Sebastian Inlet Marina, Sebastian River Marina, Capt. Hiram's Resort, Pelican Island access, Roseland Boat Ramp and every private dock in Sebastian. Class-A licensed and EPA 608 certified — we diagnose, repair, and replace every major marine HVAC brand with the saltwater corrosion expertise your vessel demands.

Marine AC Repair

Full-spectrum dockside marine HVAC service & emergency response.

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Cruisair Repair

Self-contained, split-gas, and chilled-water Cruisair systems.

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Dometic Marine AC Repair

Dometic Turbo, Emerald, SMX controls, and chiller diagnostics.

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Marine Chiller Systems

Chilled-water yacht HVAC, fan-coil units, zone controls.

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Barnacle Buster Service

Closed-loop seawater coil descaling to restore cooling capacity.

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Marine Water Pump Replacement

March, Cruisair & Headhunter raw-water pumps swapped dockside.

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Boat AC Down?

Same-day dockside response in Sebastian.

(772) 236-4277

Why Maritime Air Co.

Why Sebastian Homeowners Choose Maritime Air Co.

Class-A Licensed (CAC1824400)

Florida Class-A Certified Air Conditioning Contractor with no job-size limitations — residential, commercial, and marine.

Family-owned, Treasure Coast based

Local Port St. Lucie shop. You speak to the owner, not a national call center.

5.0 ★ on Google + Nextdoor Fave 2025

Hundreds of neighbors trust us. Read every review before you book — we publish them all, good and bad.

10-year parts & labor warranty

Standard on qualifying new installs. We register every system the day it's commissioned.

Marine HVAC specialists

Cruisair, Dometic, Webasto chillers and air handlers. Dockside service across every Treasure Coast marina.

Upfront flat-rate pricing

You approve the price before we turn a wrench. No surprise add-ons, no commission-driven tech upsells.

Our Work

Recent Sebastian Area Projects

A sample of installs and repairs we've completed near Sebastian.

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Coil Cleaning

Reviews

What Sebastian Customers Say

Real Google reviews from Treasure Coast homeowners, business owners, and captains.

5.0

37 Google Reviews

“My highest recommendations for Devon and the Maritime Air team — thorough, honest, and on time. They explained everything in plain language and didn't push any unnecessary upsells.”

Spencer Fuller

May 2026

Google

“Devon has provided thorough maintenance and excellent service. Truly family-owned care — they treat your home like it's their own. Highly recommend for Treasure Coast homeowners.”

Oh Canada

March 2026

Google

“Working with Devon on my HVAC system was a great experience from start to finish. Fair, clean install, and the system has been running perfectly through Florida summer heat.”

David Alker

February 2026

Google

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FAQ

Sebastian HVAC Questions, Answered

Do you service Sebastian, FL?+

Yes — Sebastian is the northern end of our Treasure Coast service area. Residential, commercial, and marine HVAC across Sebastian, Roseland, and Micco.

Can you service boats at Sebastian Inlet marinas?+

Yes — our marine division covers Sebastian Inlet, Sebastian River Marina, Capt. Hiram's, and private docks along the Indian River Lagoon.

What about salt exposure near the Sebastian Inlet?+

Brutal. The inlet sees some of the harshest salt air on the coast. We strongly recommend Heresite-coated equipment, sealed line-sets, and quarterly coil maintenance for any home east of US-1.

Do you work on Pelican Island area homes?+

Yes — we cover the entire Sebastian to Wabasso corridor including waterfront homes near Pelican Island and the Sebastian River.

Knowledge Graph

Every honest repair starts with the same measurements. These are the diagnostic guides our technicians use in the field — read them before you accept a diagnosis.

Diagnostic