(904) 512-0091

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.

Claim This Offer$99

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    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.

    Heating & Cooling Services

    What Shows Up With Every Mandarin HVAC Service Call

    We Know These Streets

    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.

    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 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.

    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.

    • A full diagnosis before any quote
    • The complete price, upfront
    • An honest read on repair versus replace
    Call (904) 512-0091 or book it online ↓

    HVAC Services in Mandarin, FL

    From First Call to AC Repair

    Four simple steps — and no surprises at any of them.

    1 Call or Click Tell us what’s going on — phone or the form, your pick.
    2 We Sniff It Out An honest diagnosis of the real problem — not an upsell.
    3 You Approve the Price The full number upfront, before any work starts.
    4 Done Right, Tail Wags Fixed, tested and cleaned up — guaranteed.

    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.

    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.

    Old rusted air conditioner before replacement in Jacksonville
    New energy-efficient AC unit after professional installation
    Before After

    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.

    A wall thermostat in a Jacksonville home, set for cooling
    Set to 78° — nine months a year
    The riverMoisture that never quite leaves

    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.

    The canopyEverything the oaks drop

    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.

    The layoutLong ranches, far bedrooms

    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.

    The ageSystems replacing systems

    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.

    Beauclerc

    The north end of the run, up toward the 295 interchange. Same crew and the same pricing as anywhere else we go.

    San Jose Boulevard

    The artery everything else turns off. If you are a few minutes from it, you are well inside the service area.

    Mandarin Station

    A regular stop rather than a drive-out, which is why getting to you is never the hard part of the job.

    Loretto

    The older streets, where the tree cover is heaviest and the outdoor coil fills with leaf litter fastest.

    Old Mandarin & Mandarin Road

    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.

    Out to Julington Creek

    The creek is the county line and the southern edge of what we cover. On this side of it, you are in.

    $99Refresh
    & 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?

    The Great Dane Heating & Air mascot, wrench in hand, standing beside an outdoor AC unit

    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.

    A Great Dane napping beside a Great Dane Heating & Air mailer A Great Dane at the Great Dane Heating & Air van 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.

    Jacksonville Humane SocietyMeet 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.

    • 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.

    • 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.

    • 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.

    A toddler standing on a Great Dane’s back to reach the thermostat in a cool, comfortable Jacksonville home
    Free estimate, honest answer. Tell us what your system is doing and we’ll tell you what it actually needs.

    Our work

    Check Out Some of Our Work

    Real installs from around Jacksonville — straight from our techs’ job sites.

    Mandarin specials

    Dig Up a Deal in Mandarin

    Helping Mandarin save is one more way we give back. Mention a coupon when you call.

    The Great Dane Heating & Air truck

    Reviews

    Barking Good News From Around Mandarin

    ★★★★★ 4.9 out of 5 across 74 Google reviews

    Read all 74 reviews on Google →

    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.

    Everything we do, in your neighborhood.One crew for all of it — not a different company for each job.

    Done Right the First Time

    Honest, upfront pricing and work we stand behind 100% — that’s the Great Dane guarantee.

    The Great Dane Heating & Air van

    Serving the Jacksonville, FL area

    HVAC Service Near You

    Fast, honest HVAC service across Jacksonville, Duval County and the surrounding Northeast Florida communities.

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    Proudly serving Jacksonville & all of Duval County.

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