Why Northeast Florida homeowners call Langston’s
You get the owner
Not a dispatcher, not a rotating crew. The person who diagnoses it is the person accountable for it.
Price before the work
Flat-rate repair pricing approved by you before a single part comes off the truck.
Licensed & insured in Florida
Florida Certified Mechanical Contractor CMC1251311, EPA 608 Universal certified, insured on every job.
Local, across 8 counties
Jacksonville-based, covering eight Northeast Florida counties — not a franchise routing your call out of state.
Sound familiar?
If any of this is happening, it is worth a call
You do not need to know what failed. Describing the symptom is enough to get a real answer on the phone.
- System is 12+ years old and repairs are stacking up
- R-22 system that costs more to recharge every year
- Rooms that never match the thermostat
- House cools fast but stays clammy
- Utility bills climbing season over season
- You are buying, selling, or renovating and need it done right once
What the visit includes
The part most quotes leave out: what you actually get
Four things that separate a proper job from a parts swap. All four happen on every call.
Manual J load calculation
Square footage, orientation, window area, insulation, duct condition. Oversizing is the single most common install mistake in Florida and it is what leaves a house cold and damp.
A quote you can actually compare
Model numbers, tonnage, SEER2 rating, what is included, what is not. Take it to another contractor and put them side by side — that is the point.
Ductwork and airflow addressed
New equipment on undersized or leaking ducts underperforms from day one. Duct condition gets inspected and quoted honestly, separately, so you are never guessing.
Commissioned, then documented
Charge verified by weight and by subcool, airflow set to the equipment's spec, and the startup readings handed to you in writing.
Questions
AC Installation & Replacement, answered plainly
What does a new system cost in Jacksonville?
Most residential replacements land in a broad range depending on tonnage, efficiency tier, and whether ductwork needs work. You get a firm written number after an in-home evaluation — never a phone estimate, because a phone estimate is a guess.
How long does the install take?
A straight changeout is typically one day. Adding line set, ductwork, or electrical work can push it to two.
Is financing available?
Financing options can be discussed during your in-home quote so a failed system does not have to become a financial emergency.
What efficiency should I buy?
In this climate the payback curve flattens out faster than most salespeople admit. You will get a clear breakdown of what each tier actually saves on a Northeast Florida cooling load, then you decide.
Available across all five service areas
AC Installation & Replacement is offered in Duval County, Jacksonville, Westside, Northside, Southside, Arlington, Mandarin, Riverside & Avondale, San Marco, Baldwin, Atlantic Beach, Jacksonville Beach, Neptune Beach, Clay County, Orange Park, Fleming Island, Middleburg, Green Cove Springs, Keystone Heights, Lake Asbury, Oakleaf, St. Johns County, St. Augustine, St. Augustine Beach, Ponte Vedra, Nocatee, Fruit Cove, World Golf Village, Hastings, Nassau County, Fernandina Beach, Yulee, Callahan, Hilliard, Baker County, Macclenny, Glen St. Mary, Sanderson, Bradford County, Starke, Lawtey, Hampton, Putnam County, Palatka, East Palatka, Crescent City, Interlachen, Flagler County, Palm Coast, Flagler Beach, and Bunnell.
What customers say
The reviews that matter are the ones about what actually got fixed
Not stock photos and slogans — specific jobs, specific outcomes, from homeowners and property managers across Northeast Florida.
38 Google reviews
“Mr Gary is a one of a kind gem if you need air conditioning service or repairs he's the guy to go to. Mr Gary is very thorough and persistent in locating the issue and is upfront and honest about his findings.”
Google review · AC service
“The technician was very prompt and immediate found the issue. My air was back working in no time.”
Google review · AC repair
Also handled
Related services
AC Repair
Warm air, short cycling, water on the floor — diagnosed and priced before any wrench turns.
Learn moreAC & Heating Maintenance
The tune-up that catches the $180 part before it becomes the $2,400 weekend.
Learn moreHeating Repair & Installation
Heat pumps, gas furnaces, and electric strip heat — diagnosed properly on the two weeks a year it matters.
Learn more