Upfront pricing from a crew that knows what you can and cannot do to a protected building. The local AC company for St. Augustine, Lincolnville, Anastasia Island and the beaches: air conditioning repair and installation, ductless mini splits, duct work and furnace repair.
Tell us what’s going on — we’ll get back to you in a flash.
The Great Dane difference
The St. Augustine AC Company for Buildings You Cannot Cut Into
For more than 20 years Great Dane Heating & Air has kept northeast Florida comfortable, including a good many buildings that were standing long before air conditioning was invented. A family company with upfront pricing, comfort techs who treat your home like their own, and a soft spot for shelter dogs.
Coquina, tabby and old masonry do not behave like stud and drywall, and the answer in these buildings is almost never the one that works three miles inland. Knowing that before quoting saves everybody a wasted visit.
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 across northeast Florida, on buildings of every age this region has to offer. 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.
Four Centuries of Building, None of It Designed for Ductwork
St. Augustine has been here since 1565, and a great deal of what stands downtown went up before anyone imagined mechanical cooling. That changes what is possible, not just what is difficult.
78°Set to 78° — nine months a year
The wallsMasonry stores the day
Coquina and old masonry hold heat rather than blocking it, and they have no cavity to insulate. A wall that baked all afternoon is still giving that heat back into the room at nine at night, which reads as an undersized system and is not one.
The permissionNot entirely your decision
Inside the historic district, what changes on the exterior is subject to review. Where an outdoor unit sits, what it looks like and whether it can be seen are all live questions, and they are far cheaper to answer before equipment is ordered than after.
The absence of ductNowhere to run it
Many of these buildings have no duct and no realistic route for it, because the walls cannot be opened and the ceilings cannot be lost. Ductless is not a compromise here so much as the honest answer, and it is why so much of our work in this city is mini splits.
The moistureWhat actually does the damage
Old masonry and timber move water differently from modern construction, and humidity left unmanaged damages the building itself, not just comfort. Cooling hard while ignoring the moisture is the mistake that costs the most here, and it is the easiest one to make.
St. Augustine Service Area
From the Plaza Out to Anastasia
Four centuries of building in one small city, and almost none of it designed with ductwork in mind. This is where the truck actually ends up.
The Historic District
Coquina, masonry and tabby, under architectural review. What you can change outside is genuinely not your decision here.
Lincolnville
Smaller historic houses south of the plaza, most of them wood frame and most of them added to over a century.
Anastasia Island
Across the bridge, closer to the ocean, and the part of the run where salt gets into the conversation.
Davis Shores
Mid‑century houses on the island side, and a noticeably different problem from the buildings downtown.
St. Augustine Beach
Oceanfront and just behind it. Shorter service intervals out here and a good reason for them.
US‑1 & the West Side
Newer subdivisions inland, where the equipment is young and the questions are about balance rather than access.
$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
The Dog Is the Whole Reason
Great Dane Heating & Air is run by people who cannot walk past an animal, and the company was set up on the understanding that it ought to be worth something to the pet population of the region rather than only to its customers.
That means rescue events, hours spent with the animals still waiting at the shelter, and a Rescue of the Week put in front of everyone who follows us. It is also why we are a Paw Partner Corporate Sponsor of the Jacksonville Humane Society.
Comfortable in a Building That Predates the Country
A working air conditioner is comfort. In a masonry building under architectural review, getting there is as much about what you are permitted to do as about what the equipment can manage.
Vetted people in a protected building
Florida state certified — licence CAC036942 — fully insured, and BBB accredited at an A+ rating. The same small crew every time, which matters a great deal when the walls cannot be opened up and put back.
Air in a building that breathes
Old masonry moves moisture in ways modern construction does not, and humidity is what damages the fabric of these buildings as much as it bothers the people in them. Filtration and humidity control do more here than extra cooling ever will.
What is actually allowed
If the honest answer is that the work needs approval before it can happen, you get told that first rather than after a deposit. 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.
The house has thick masonry walls and one room never cools.+
Masonry holds heat rather than resisting it, so a wall that took sun all afternoon is still releasing it into that room at nine at night. The equipment is usually fine and the room is simply being fed by a wall. We measure the supply air at that register before concluding anything about the system.
There is no ductwork anywhere. How is the house cooled at all?+
Usually by something added long after the building went up — window units, a retrofitted run through a closet, or ductless heads. Each of those has a different failure pattern, and the first job on a call here is often working out what somebody installed twenty years ago and why.
The system runs constantly in summer. Is that normal here?+
Closer to normal than it would be inland. A masonry building with no cavity insulation, near the water, in August, gives a system a great deal to do. What matters is whether it is keeping up while running, which is a measurement rather than an impression.
Can anything be installed in a building under architectural review?+
Yes, but where the outdoor equipment sits and what can be seen from the street are genuinely not your decision alone. We establish that before anything is ordered. It is the single most common reason a straightforward job here turns into a delayed one.
Is ductless the only option in a building like this?+
Frequently it is the best one, and occasionally it is the only one. Where you cannot open walls or lose ceiling height, a ductless head serves a room without asking the building to change. In larger or already‑modified buildings there are sometimes other routes, and we will lay both out.
The building is three hundred years old. Will a modern system damage it?+
Not if the humidity side is handled properly, which is the part people skip. Cooling a historic building hard while ignoring moisture is how plaster and timber get damaged. The right specification here manages humidity deliberately rather than treating it as a by‑product of cooling.
Does being this close to the water affect the equipment?+
On Anastasia Island and out toward the beach, considerably. Salt settles on the outdoor coil and shortens its working life, and the closer you are the shorter it gets. Downtown it matters less than on the island, but it is never nothing this close to the inlet.
What is the $99 HVAC Refresh & Tune‑Up?+
A full seasonal check‑over of the system you already have — measurements taken, the parts that genuinely foul cleaned, and a straight answer about what needs attention and what does not. In an older building it is also when we look at what the humidity is doing to the fabric. Cannot be combined with any other offer, one per household.
The building smells musty even when it is cool.+
That is humidity rather than temperature, and in a masonry building it is worth taking seriously, because the same moisture that makes a room smell is working on the plaster and the timber. Measuring humidity in a few rooms tells you whether it is the system, the building, or both.
Do you come this far south?+
Routinely. St. Augustine, Lincolnville, Anastasia Island, Davis Shores, Vilano and St. Augustine Beach are all inside the normal service area at the same pricing as anywhere else we go. Great Dane is licensed in Florida as CAC036942, which you are welcome to look up before you let anybody into the house.
Will you tell me if I do not need the work?+
Yes, and in these buildings it comes up constantly, because the instinct with anything this old is to assume everything needs replacing. Often what it needs is a setting, a seal or a humidity strategy rather than equipment.
Anything worth checking before I call?+
Three things that cost nothing. Check the breaker for the air handler and for the outdoor unit. Look at the filter, because a collapsed one starves the system and imitates a far bigger fault. And note whether the problem is heat or damp — in a building like yours those are two very different visits.
Everything we do, in your neighborhood.One crew for all of it — not a different company for each job.
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