Jacksonville’s Top Dog in AC Repair & Installation
Honest, upfront pricing and comfort techs who treat your home like their own — done right the first time. The local AC company for heating and cooling across Jacksonville and Duval County: air conditioning repair and installation, mini splits, duct cleaning and furnace repair, all from one crew.
Tell us what’s going on — we’ll get back to you in a flash.
The Great Dane difference
The AC Company Jacksonville Chooses
For more than 20 years, Great Dane Heating & Air has kept Jacksonville and Duval County comfortable — one honest repair at a time. We’re a family company with upfront pricing, comfort techs who treat your home like their own, and a soft spot for shelter dogs.
What Shows Up With Every Jacksonville HVAC Service Call
You Approve the Price
We diagnose the problem, show you exactly what failed, and give you the full price before a single wrench comes out. You decide from there — no pressure, and no work you didn’t agree to.
Licensed & Insured
Florida state certified contractor CAC036942, fully insured, and accredited with the Better Business Bureau at an A+ rating. Every tech who pulls into your driveway works under that license.
20+ Years in Service
Two decades keeping Jacksonville and Duval County comfortable. The people who answer your call are the same people who show up at your door.
Every Job Gives Back
We’re a proud supporter of the Jacksonville Humane Society. Part of what you spend keeping your home comfortable helps shelter dogs here in Jacksonville find one of their own.
No cost, no pressure
Get a Free Estimate on Your System
Tell us what it’s doing. We find the real problem, give you the whole number before any work starts, and tell you straight if a repair is not worth your money.
When your air conditioner is past its prime, more AC repair isn’t always the answer. A new, energy-efficient AC installation can end the breakdown cycle, cool your home evenly, and take a real bite out of summer power bills.
Our Jacksonville team gives you the honest math on AC replacement vs. repair, sizes the new system correctly for Florida heat, and leaves the job site cleaner than we found it — just like this install.
Northeast Florida is harder on a system than almost anywhere else in the country. Four reasons — and where each one lives in your house.
78°Set to 78° — nine months a year
March–NovemberYour AC Never Gets a Break
Your system cools from March into November and still runs on warm January afternoons. Parts wear by the hour rather than by the calendar, which is why a system here is effectively older than its age.
Salt airCoastal corrosion
From the beaches through the Intracoastal neighborhoods, salt spray eats condenser coils and the fins around them. Capacity drops long before anything quits — the first sign is usually the power bill.
The waterHumidity and drain lines
A Jacksonville summer asks your system to pull gallons of water out of the air, and every drop has to drain somewhere. A clogged condensate line is one of the most common no‑cool calls in this climate.
The atticDucts in 120‑Degree Air
Most Jacksonville ductwork runs through an attic that climbs well past 120 degrees in summer. Air chilled to the mid‑50s has to cross that space before it reaches a register — so a loose joint or a thin patch of insulation is paid for in every room.
$99Refresh & Tune‑Up
Limited‑time offer
$99HVAC Refresh & Tune‑Up
A full seasonal check‑over of the system you already have — so small problems stay small.
Straight talk: If somebody tells you your system is “illegal now” because of the refrigerant rules — it isn’t. R‑410A systems can still be serviced. New equipment moved to R‑454B in 2025 and R‑410A production is stepping down, so topping off an older system gets pricier every year. That’s a reason to plan, not a reason to panic‑buy tonight.
Paw Partner
Community
Every Job Gives Back
We didn’t name the company after a dog by accident. Great Dane Heating & Air was founded with the intention of giving back to our furry friends — we’re the definition of “animal people,” and we’re always looking for new ways to support the pet population of Duval County.
Whether it’s volunteering at rescue events, paying shelter animals a visit, or spotlighting a Rescue of the Week on our social channels, we’re proud to be a Paw Partner Corporate Sponsor of the Jacksonville Humane Society.
A working air conditioner is comfort. A system looked after properly is something closer to peace of mind — especially in a Jacksonville August, and especially with small people in the house.
Vetted people in your home
Florida state certified — licence CAC036942 — fully insured, and BBB accredited at an A+ rating. The same small crew every time, not a rotating list of subcontractors.
The air they breathe all day
Florida humidity does not just make a house uncomfortable — it feeds what grows in it. Filtration, purification and humidity control keep the air in your rooms clean as well as cold.
Fixed right the first time
We show you the failed part, quote the whole number before we start, then test the system and clean up behind us. Our work is guaranteed — that is the whole point of the name on the truck.
Free estimate, honest answer.Tell us what your system is doing and we’ll tell you what it actually needs.
Paul came out and replaced our blower motor and saved the day. He fielded my call on Sunday evening, then did the service Monday afternoon. Friendly, efficient, and professional.
After years of feeling vulnerable to dishonest HVAC companies, a neighbor put me in touch. He quickly earned my trust — quick to return calls, reasonable rates, and he’s never tried to sell me things I don’t need.
We’ve used him for everything from small tweaks to replacing our entire unit. Quick, reliable, honest, and clean — and he beat the prices of every competitor. Yes, we priced out seven.
Fast and efficient, unbelievably affordable pricing. He quickly figures out the problem and explains it in a way anyone can understand. You automatically feel like you can trust him.
Our A/C went down and the team showed up Monday morning first thing. We had cool air flowing in no time. The crew was fast, clean, and finished under time.
Mike and the team were very professional, friendly, and knowledgeable. The price was not unreasonable. So happy we found this company — we know we will be taken care of in the years to come.
Just had Great Dane install a new A/C in my home. Mike came to my home, saw what I had, and I told him what I wanted installed. There was absolutely no sales pressure.
Mike came out and gave an estimate with no fluff, which is what I like. He was honest and professional. The team that installed the unit worked well together and the work performed was stellar!
The questions Jacksonville asks us most — straight answers, no jargon.
Why is my AC running but not cooling the house?+
The usual Florida culprits are a clogged filter, a dirty outdoor coil, low refrigerant from a small leak, or a failing capacitor. A proper diagnostic pinpoints which one it is, and most of them are straightforward to put right.
Why is my AC freezing up?+
Ice on the lines or coil usually means restricted airflow (often just a dirty filter) or low refrigerant. Turn the system off so it can thaw and give us a call — running it frozen can damage the compressor.
My AC is making a weird noise. Should I worry?+
Grinding, squealing or banging usually means a motor, bearing or fan problem that gets more expensive the longer it runs. Shut it down and have it looked at — catching it early is the cheap version.
How long do AC units last in Florida?+
With our humidity, salt air and near-year-round run time, most systems last 10–15 years here — a bit less than up north. Regular maintenance is what gets you to the long end of that range.
Should I repair or replace my AC?+
If the system is 10+ years old and facing a major repair, replacement often saves more over time — newer units also cool better and cost less to run. We’ll give you the honest math both ways, then you decide.
What size AC does my house need?+
Bigger isn’t better — an oversized unit short-cycles and leaves your air muggy. We size systems with a proper load calculation for Florida humidity, not a guess off square footage.
How often should my HVAC be serviced in Florida?+
Twice a year is ideal — a cooling tune-up in spring and a heating check in fall. Florida systems work harder than almost anywhere, and tune-ups are how you avoid the August breakdown.
How often should I change my air filter?+
Every 1–3 months for most homes — monthly if you have pets. (We’re dog people. We know exactly how much fur one good boy produces.)
Why is my energy bill so high in summer?+
A struggling system runs longer to do the same job. Dirty coils, low refrigerant, leaky ducts or an aging unit are the usual suspects — a tune-up usually finds the money leak.
How much does AC repair cost in Jacksonville?+
It depends on the fault, so we diagnose first and give you the full price upfront — before any work starts. No surprises when the job’s done is the whole point.
Do you serve my area?+
We serve Jacksonville and all of Duval County — if you’ve seen the teal truck around, you’re in our territory. Not sure? Call and we’ll tell you straight.
My AC died and it’s sweltering. How fast can you get here?+
Call (904) 512-0091 and we’ll tell you honestly when we can be there. Worth calling straight away if anyone in the house is elderly, very young, pregnant or has a heart or breathing condition, if you smell burning, if water is coming through a ceiling, or if the breaker trips again after one reset. Otherwise, if the house is holding in the low 80s overnight, the morning is usually fine.
One call covers the rest of the house.This page is one job. These are the others.
AC Repair
Fast, honest fixes when the cool cuts out. We diagnose it right and quote it upfront — before the work starts.
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AC Replacement & Installation
Right-sized new systems with honest quotes. We help you pick what actually fits your home and budget.
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Emergency AC Repair
Broke down in the Florida heat? Call and we’ll tell you what it is likely to be, and whether it can safely wait until morning.
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Heating Repair
Warm and ready for the cold snaps. Furnaces, heat strips and everything in between.
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HVAC Maintenance
Seasonal tune-ups that prevent summer breakdowns and keep your energy bills in check.
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Heat Pump Services
Efficient heating and cooling in one system — perfect for Florida weather.
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Ductless Mini-Splits
Cool the rooms your ducts can’t reach — garages, additions, sunrooms and more.
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Air Duct Cleaning
Cleaner air and better airflow from every vent in the house.
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Indoor Air Quality
Purifiers, filtration and humidity control so your family breathes easier.
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Commercial HVAC
Installs, repairs and maintenance that keep Jacksonville businesses comfortable.
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Commercial AC Repair
When the cooling quits mid-shift, we find the real fault and give you the number before any work starts.
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Commercial AC System Replacement
Right-sized equipment for your space, quoted upfront so there are no surprises on the invoice.
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Commercial Preventative HVAC Maintenance
Scheduled tune-ups that catch small faults early — before they turn into a closed sign.
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Commercial Indoor Air Quality
Filtration and humidity control for offices, shops, salons and waiting rooms.
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Commercial Air Duct Cleaning
Cleaner air and better airflow through every vent in the building.
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Paw Partner
Meet the Jacksonville Humane Society →
Mini-split install, done right
Wiring up a new system
High-efficiency system on a fresh pad
Twin-system install
Bryant condenser on a fresh pad
Condenser replacement
New air handler, tucked in clean
Delivery day
The big teal truck
Our smallest biggest fan
Come say hi at the home show
Airflow Why Your AC Freezes Up in a Florida Summer
Repair How to Reset Your AC After a Power Outage
Humidity Why Your House Feels Sticky at 74 Degrees