Mandarin, Loretto, Beauclerc and out toward Julington Creek are part of our normal week — not a drive-out. The same crew works these houses, which is usually why we know what the system is before the panel comes off.
Mandarin’s Local HVAC Company
HVAC & AC Repair in Mandarin, FL
Honest, upfront pricing and comfort techs who treat your home like their own. The local AC company for Mandarin, Loretto, Beauclerc and out toward Julington Creek: air conditioning repair and installation, mini splits, duct cleaning and furnace repair, all from one crew.
Limited‑time offer
HVAC Refresh & Tune‑Up
Cannot be combined with any other offer. One per household.
Get Your Free Estimate
Tell us what’s going on — we’ll get back to you in a flash.
The Great Dane difference
The AC Company Mandarin Chooses
For more than 20 years, Great Dane Heating & Air has kept Jacksonville and Duval County comfortable — one honest repair at a time, and this side of the river has always been part of the week. A family company with upfront pricing, comfort techs who treat your home like their own, and a soft spot for shelter dogs.
- 4.9★ Across 74 Google Reviews
- Licensed & Insured — FL CAC036942
- BBB A+ Accredited Business
- Installation, Service & Repair
- Heating, Cooling, Air & Ventilation
Heating & Cooling Services
What Shows Up With Every Mandarin HVAC Service Call
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.
Two decades across Duval County, and Mandarin has been on the route for most of them. The people who answer your call are the same people who show up at your door.
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.
- A full diagnosis before any quote
- The complete price, upfront
- An honest read on repair versus replace
HVAC Services in Mandarin, FL
From First Call to AC Repair
Four simple steps — and no surprises at any of them.
Residential & Commercial HVAC in Mandarin
Heating & Cooling Services for Mandarin Homes
From emergency AC repair and duct cleaning to brand-new systems and mini splits — one crew across Jacksonville and Duval County.
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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Not sure what you need? Call (904) 512-0091 — we’ll sniff it out.
Heating and Cooling in Mandarin, FL
Don’t Sweat the Dog Days of Summer
Honest techs, upfront pricing, and cool air your whole pack can agree on.
AC Replacement & Installation in Jacksonville
Old AC Out. New Comfort In.
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.

Air Conditioner Repair & Replacement
Why Mandarin Is Harder on an Air Conditioner Than Most of Jacksonville
The river on one side, an old tree canopy overhead, and a lot of houses built before anybody was sizing for humidity. Four things this part of town does to a system.

Being this close to the St. Johns keeps the air wet well into the evening, and a system only dehumidifies while it is actually running. A machine that cools the house quickly and shuts off leaves the water behind — which is why a Mandarin house can read 74 degrees and still feel like it needs a towel.
Shade is welcome and the debris is not. Leaf litter, pollen and oak grit pack into the outdoor coil through the year, and the unit keeps running while its capacity falls. It is the failure most likely to be blamed on the equipment when it is really housekeeping.
Much of Mandarin went up as single‑storey houses on wide lots, which puts the last bedroom a long way from the air handler. Where the ducts were sized to the floor area rather than the run, that room was never going to keep up, and no amount of new equipment changes it.
A great deal of this housing stock is on its second or third air conditioner. What that means in practice is mismatched parts, a coil from one decade sitting under an outdoor unit from another, and duct that has been worked around rather than replaced. Worth knowing before anybody quotes you.
Mandarin Service Area
Every Turn Off San Jose Boulevard
Mandarin is not a stop on a wider route — most weeks it is the route. This is where the truck actually ends up, from the river down to the county line.
The north end of the run, up toward the 295 interchange. Same crew and the same pricing as anywhere else we go.
The artery everything else turns off. If you are a few minutes from it, you are well inside the service area.
A regular stop rather than a drive-out, which is why getting to you is never the hard part of the job.
The older streets, where the tree cover is heaviest and the outdoor coil fills with leaf litter fastest.
The riverfront strip under the oldest oaks in the area. Closest to the water and deepest in the shade — the two conditions hardest on a condenser.
The creek is the county line and the southern edge of what we cover. On this side of it, you are in.
& Tune‑Up
Limited‑time offer
HVAC Refresh & Tune‑Up
A full seasonal check‑over of the system you already have — so small problems stay small.
Cannot be combined with any other offer. One per household.

HVAC Repair & Replacement in Jacksonville
Let’s Figure This Out Together
No quote needed, no email, no phone number — just tell us what it’s doing and we’ll give you our honest read.
1How old is the system?
2What’s it doing? tick all that apply
3How often has it needed fixing?
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 Puts Something Back
The name was not a marketing decision. Great Dane Heating & Air was started by animal people, and the intention from the beginning was that the work would put something into the pet population of Duval County rather than only take a living out of it.
That looks like volunteering at rescue events, turning up to spend time with shelter animals, and putting a Rescue of the Week in front of our followers. It is also why we are a Paw Partner Corporate Sponsor of the Jacksonville Humane Society.
Meet the Jacksonville Humane Society →
Mandarin Families
Keeping Mandarin Families Safe and Cool
A working air conditioner is comfort. One that has been looked after is closer to peace of mind — especially in a Mandarin August, when the river holds the humidity in long after the sun has gone, and especially with small people in the house.
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Vetted people in your Mandarin home
Florida state certified — licence CAC036942 — fully insured, and BBB accredited at an A+ rating. The same small crew every time, which is how a Mandarin HVAC company ends up knowing your system before it knocks.
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Indoor air quality, not just cold air
Under this much shade the air comes in damp and stays damp, and Florida humidity does not just make a house uncomfortable — it feeds what grows in it. Filtration, purification and humidity control keep indoor air quality in Mandarin homes as clean as it is cold.
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Every AC repair, done once
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.
Our work
Check Out Some of Our Work
Real installs from around Jacksonville — straight from our techs’ job sites.
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
Quality inspector on duty
Our smallest biggest fan
Come say hi at the home show
Mandarin specials
Dig Up a Deal in Mandarin
Helping Mandarin save is one more way we give back. Mention a coupon when you call.
One per household. Cannot be combined with any other offer.
See all four offers →Reviews
Barking Good News From Around Mandarin
★★★★★ 4.9 out of 5 across 74 Google reviews
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.
Beyond reproach. Prompt, professional, and had the problem diagnosed and repaired the same day. Integrity, honesty and great customer service.
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.
They replaced our entire AC unit and did some duct work. Professional staff and excellent communication. Top quality service and work!
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!
From the blog
Straight Answers From a Jacksonville Air Conditioning CompanyWhat We’d Tell You About HVAC in Jacksonville, FL
No fluff and no scare stories — the same answers we give on the phone, written down so you can try the free fix first.
Airflow Why Your AC Freezes Up in a Florida Summer
Ice on an air conditioner in ninety-degree weather looks like a contradiction, but it is ordinary physics. Your evaporator coil is supposed to run…
Repair How to Reset Your AC After a Power Outage
The power flickers, comes back, and the AC does not. Before you decide it is broken, understand what it is probably doing: waiting on…
Humidity Why Your House Feels Sticky at 74 Degrees
Cooling and drying are two different jobs, and a system can do the first while skipping the second. Start with the free fix, then…
FAQ
Sniffing Around for Answers in Mandarin?
The questions Jacksonville asks us most — straight answers, no jargon.
My house is cool but it still feels damp. Why?
Because cooling and drying are two different jobs, and being this close to the St. Johns means there is more water in the air to remove. A system only dehumidifies while it is actually running — one that is oversized for the house hits the set temperature quickly, shuts off, and leaves the moisture behind. The fix is usually run time and airflow rather than a bigger machine, which is the opposite of what tends to get recommended.
The outdoor unit is buried in oak leaves. Does that actually matter?
Under a mature canopy it matters more than almost anything else we see. That coil is how the heat gets out of your house, and through the year it fills with leaf litter, pollen and the fine grit that comes off oak bark. A packed coil makes the compressor work harder for less cooling, and it usually shows up on the power bill long before it shows up as a breakdown.
One back bedroom never keeps up. Is that the air conditioner?
On a long single‑storey house it is usually the duct run rather than the equipment. The far bedroom is at the end of the longest run, and if the system was sized to the square footage instead of the layout, that room was never getting its share. We measure the airflow at that register and at the air handler — the gap between the two tells you whether it is duct, return or genuinely the system.
My house is from the eighties. Is the system worth repairing?
Frequently, yes. Age tells you roughly how much life is left; it does not tell you what failed. A capacitor, a contactor or a closed‑up drain line on a thirty‑year‑old house is still a capacitor, a contactor or a drain line. We measure first and tell you which of those two situations you are actually in — and we will say plainly when the honest answer is a replacement.
Would a bigger system fix the humidity?
It usually makes it worse. A larger unit reaches the thermostat setting faster, runs for shorter periods, and therefore pulls less water out of the air. In this climate run time is doing half the work. Sizing comes from a load calculation on your house, not from the label on the outgoing unit.
What is different about replacing a system in an older Mandarin house?
A lot of this housing stock is on its second or third air conditioner, which in practice means mismatched parts — a coil from one decade sitting under an outdoor unit from another, and duct that has been worked around rather than replaced. We look at the whole system before quoting, because putting a new machine on old duct is how people end up disappointed with a system that is working perfectly well.
How often should a system be serviced under all these trees?
The canopy is the reason we would push maintenance here harder than in most parts of town. What the oaks drop lands in the outdoor coil year‑round, and a coil that is cleaned on schedule holds its capacity while one left alone quietly stops earning its rating. The visit is mostly measurement and cleaning, not a sales call.
What is the $99 HVAC Refresh & Tune‑Up?
A full seasonal check‑over of the system you already have: measurements taken, the parts that actually foul cleaned, and a straight answer about what does and does not need attention. It is the one thing on this website we will tell you outright is worth doing. Cannot be combined with any other offer, one per household.
Does the spring pollen really affect the system?
It does, and in two places. The filter loads up faster than people expect, which starves the system and can look like a much larger fault. And the outdoor coil collects a film that behaves like insulation on the surface that is supposed to be shedding heat. Neither is dramatic; both cost you capacity you already paid for.
Do you actually cover Mandarin, or is it extra?
It is one of the areas we are in most often. Mandarin, Loretto, Beauclerc, Mandarin Station and out toward Julington Creek 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 it is the part of the job we would rather be known for. The most useful sentence on a lot of visits is that nothing here needs replacing. If something is drifting but has not failed, you get told that too, with the reading that shows it, so you can decide rather than guess.
Is there anything I should check before I call?
Three things, none of which cost anything. Check the breaker for the air handler and for the outdoor unit. Look at the filter — a collapsed one starves the system and imitates a much bigger fault. And look at the outdoor coil for leaf pack, which around here is the likeliest single answer. If one of those is the problem, you would rather find it yourself than pay somebody to point at it.
Done Right the First Time
Honest, upfront pricing and work we stand behind 100% — that’s the Great Dane guarantee.
Serving the Jacksonville, FL area
HVAC Service Near You
Fast, honest HVAC service across Jacksonville, Duval County and the surrounding Northeast Florida communities.



