Upfront pricing from a crew that has seen these houses in every configuration they have had. The local AC company for Springfield and the historic district: air conditioning repair and installation, duct work, ductless mini splits 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 Springfield Calls Mid‑Renovation
For more than 20 years Great Dane Heating & Air has kept Jacksonville and Duval County comfortable, including a fair number of houses that were mid‑project when we met them. A family company with upfront pricing, comfort techs who treat your home like their own, and a soft spot for shelter dogs.
Springfield is a short run and a repetitive one, in the useful sense — the same subdivisions, the same abandoned duct, the same two systems doing the job of one. It means we know what to look for before we look.
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 Duval County, and long enough to have watched a good part of this neighbourhood come back. 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.
Springfield went up as single‑family, spent decades cut into apartments, and is being put back together now. The heating and cooling in most of these houses is still answering one of the older questions.
78°Set to 78° — nine months a year
The divisionSystems for a plan that is gone
A house split into four units got equipment to match, and reconversion rarely undid that. What you are left with is two or three systems where the house now needs one or two, each sized for a footprint that no longer exists. Working out which to keep is the first real question here.
The leftoversRuns that feed nothing
Duct from an earlier configuration tends to stay where it is, sealed off at one end or simply forgotten. Air pushed into a closed stairwell or a walled‑up room is airflow you are paying for and never feel. It is one of the more satisfying things to find.
The chasesRoutes a modern house lacks
The upside of a house this old is vertical space. Disused chimney flues, old service stairs and stacked closets give duct a way between floors without opening finished walls — which is exactly why two contractors can look at the same house and quote very different jobs.
The footprintMore house than you use
These are big houses, and most families live in a fraction of one. Conditioning all of it to be comfortable in part of it is the single largest avoidable cost here, and zoning or a ductless head aimed at the rooms actually in use usually beats a larger system aimed at everything.
Springfield Service Area
From Main Street to Klutho Park
A small grid of very large houses, most of which have been at least two different things. This is where the truck actually ends up.
The Historic District
The heart of it, and the part where what you change outside is not entirely your decision. We plan around that rather than discover it.
Main Street
The commercial spine. Shops, kitchens and offices along it are work we take on the commercial side.
Klutho Park & Around
Some of the largest houses in the neighbourhood, and the ones most likely to be carrying more than one system.
Eighth Street
The northern edge. A mix of finished restorations and houses still working through it.
Silver Street & Laura
Quieter residential blocks where a good number of the conversions back to single family have already happened.
Out Toward Norwood
The northern end of the run, where the houses get a little smaller and the systems a little simpler.
$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 Was Always the Point
Great Dane Heating & Air took its name from the animal, not the other way round. It was started by people who cannot leave a shelter empty‑handed, and the plan was always that the company would be worth something to the pet population of Duval County.
That means rescue events, time spent with the animals still waiting, and a Rescue of the Week shared with everyone who follows us. It is also why we are a Paw Partner Corporate Sponsor of the Jacksonville Humane Society.
A working air conditioner is comfort. In a house that has been four apartments and is a home again, it is mostly a question of whether the system still matches the floor plan.
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, which is worth a good deal in a house that is still a building site in places.
Air in a house being worked on
Renovation dust travels, and a system running through it carries the lot into every room and back again. Filtration and a sensible plan for what runs while work is going on save a clean‑up nobody enjoys.
The order things should happen in
If the right move is to wait until the walls are open, you will be told to wait rather than sold the job twice. 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 two systems and I only use one of them.+
That is the usual inheritance from the apartment years. Each unit got its own equipment, and when the house went back to being a house nobody removed the spare. Sometimes the second system is genuinely useful for an upper floor; sometimes it is cost with no benefit. We measure what each one covers before you decide which to keep.
Air comes out of a vent in a room that is not there any more.+
Then there is still duct connected to a configuration the house has moved on from. It is common here and it is worth tracing, because a run feeding a closed‑off space is airflow that never reaches you and is being paid for every cycle.
One floor works and the other does not.+
In a house this size on a single system that is nearly always the duct rather than the equipment. The run to the upper floor in a converted house is often whatever was easiest at the time. Measuring airflow at both ends tells you whether it is the run, the return, or genuinely the system.
We are renovating. When should the HVAC happen?+
While the walls are open, if you have any choice about it. Duct is enormously cheaper to route properly before plaster goes back than after, and the decisions made at that stage set what the house can do for the next thirty years. We would rather quote it early and correctly than cheaply and twice.
Do we need one big system or several small ones?+
It depends on how much of the house you actually live in. A large restored house where two rooms are used daily and four are not is a strong case for zoning or for ductless heads, rather than conditioning the whole envelope to serve a corner of it. We will lay out both and the running difference between them.
Can duct be run without tearing into finished rooms?+
Often, yes. Houses of this age tend to have vertical routes that modern ones do not — disused chimney chases, old service stairs, closets stacked on top of each other. Finding those is most of the skill in these installs and it is why the same house can be quoted very differently by two people.
Should the system run while the house is being worked on?+
Ideally not through the dusty stages, and where it must, not without protecting it. Renovation dust goes straight through a standard filter, coats the indoor coil and shortens the life of everything downstream. A plan for this costs nothing and saves a clean that is not cheap.
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 a house with more than one system it is also where you find out whether the second one is earning its place. Cannot be combined with any other offer, one per household.
The house smells of old house. Is that fixable?+
Partly, and it is worth being honest about which part. Filtration and humidity control deal with what is in the air now. What they do not fix is duct that has been sitting unused, or a return pulling from a space that has been closed up for decades — those want dealing with directly.
Do you cover Springfield?+
It is one of the shorter runs we make, and the whole historic district is 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 here that often means telling you to do nothing yet. Half the houses we look at in this neighbourhood are mid‑project, and the honest answer is frequently that the HVAC decision belongs three steps later. You will get that rather than a quote.
Anything worth checking before I call?+
Three things that cost nothing. Check the breakers — with more than one system there is more than one to find. Look at the filters, because a collapsed one starves a system and imitates a far bigger fault. And note which rooms actually have air coming out, because in these houses that list is the diagnosis half the time.
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