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.
01
Troubleshooting
5 min read
AC running but not cooling? What to check first
The blower is running and air is moving, but the house keeps climbing. Four checks you can do in five minutes, and the line where it stops being a homeowner job.
Read the guide5 min read
Why is my AC freezing up?
Ice on the copper line is a symptom, not the disease. Two things cause it, one of them you can fix yourself, and chipping at the ice makes it worse.
Read the guide6 min read
AC drain line clogged: what to do before you call
The number one cause of summer shutdowns in Florida is a line full of algae. Often a twenty-minute fix — here is how to do it without making it worse.
Read the guide02
Comfort & Humidity
6 min read
Why your house feels sticky even with the AC running
The thermostat reads 74 and the house still feels wrong. That is a moisture problem, and a bigger air conditioner will make it worse, not better.
Read the guide5 min read
Heat pump vs. heat strips in North Florida
Your heat pump and its backup strips are two different heaters with very different costs. Knowing which one is running explains a lot of January power bills.
Read the guide03
Buying & Replacing
6 min read
What size AC does a Jacksonville home need?
The rule of thumb says one ton per 500 square feet. In a humid climate, that rule is how houses end up cold, clammy, and expensive.
Read the guide6 min read
Repair or replace your AC: how to decide
Age alone is a bad reason to replace a system, and a bad reason to keep one. Four factors that actually decide it.
Read the guide5 min read
How long does an AC last in Florida?
National charts say 15 to 20 years. Florida runs shorter, and the reasons are specific enough that you can influence most of them.
Read the guide5 min read
What SEER2 rules mean for Florida homeowners
Your new system's efficiency number may look lower than your old one's. The equipment did not get worse — the test did.
Read the guide04
Local
5 min read
Who issues HVAC permits in Duval, Clay and St. Johns?
A system change-out needs a permit and an inspection. Skipping it saves a few hundred dollars now and surfaces at the worst possible moment — closing day.
Read the guide6 min read
Buying a Jacksonville home: HVAC inspection checklist
A general home inspection confirms the AC blows cold. That is not the same as knowing what you are inheriting.
Read the guide