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.
What breaks in San Marco
Local housing stock has local failure patterns
Three things that come up repeatedly on San Marco calls — worth knowing before you spend money on the wrong fix.
- 1
Original-construction homes here frequently have duct retrofitted into closets, chases, and crawl spaces, which is the usual source of rooms that never balance.
- 2
Plaster walls, limited chases, and small mechanical closets restrict what equipment physically fits — sizing has to account for the building, not just the load.
- 3
Ductless mini-splits solve additions, converted porches, and upstairs rooms that a historic duct system was never going to reach.
Available here
Every service, available in San Marco
Nothing on this list is restricted by market. The only thing that varies by location is scheduling, and that is stated up front.
AC Repair
Warm air, short cycling, water on the floor — diagnosed and priced before any wrench turns.
AC Installation & Replacement
Load-calculated sizing, a written quote with the model numbers on it, and an install that actually gets commissioned.
AC & Heating Maintenance
The tune-up that catches the $180 part before it becomes the $2,400 weekend.
Heating Repair & Installation
Heat pumps, gas furnaces, and electric strip heat — diagnosed properly on the two weeks a year it matters.
Indoor Air Quality
Humidity control, filtration, and duct integrity — the three things that decide how a Florida house actually feels.
Commercial Refrigeration
Walk-ins, reach-ins, and prep tables. Product on the line means this call moves up.
Ductless Mini-Splits
Garages, additions, Florida rooms, and that one bedroom that has never been comfortable.
Property Management HVAC
One contact, documented visits, and tenants who stop calling you about the AC.
Neighborhoods
Where calls come from in San Marco
- San Marco Square
- St. Nicholas
- Miramar
- Colonial Manor
- Granada
- Empire Point
- Southbank
Not on the list? Coverage in Duval County extends beyond these — call and you will get a straight yes or no on your address, not a runaround.
Questions
Serving San Marco, specifically
Do you charge extra to come out to San Marco?
The diagnostic fee is quoted on the phone before dispatch, and it is quoted for your specific address — so there is never a travel surcharge that appears on the invoice after the fact.
How quickly can you get to San Marco?
San Marco pairs 1920s homes with newer infill, so two houses on the same block can need completely different solutions.
Do you service rental properties in San Marco?
Yes. Residential property management is a core part of this business — direct tenant scheduling, per-unit service history, and invoicing structured however your bookkeeping prefers.
Which services are available in San Marco?
All of them: AC repair and installation, heating, maintenance, indoor air quality and humidity control, ductless mini-splits, and light commercial refrigeration.
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