The symptom pages and the long reads, sorted for a Duval address
Half of this library answers the question you have at 9 p.m. when the air goes warm. The other half answers the ones you'll have next spring when the quote arrives.
Start with the symptom
Eight problems account for most Jacksonville calls: air running but warm, ice on the lines, a system cycling every few minutes, a house that feels sticky at 74 degrees, a JEA bill that jumped, a new noise, water around the air handler or on a ceiling, and a breaker that trips. Each has a page written for this city’s housing stock, because a frozen coil in a 1960s Arlington ranch with leaky attic ducts has a different likely cause than the same ice in a sealed 2015 house in Oceanway.
Each page ranks the likely causes by how often we find them in Duval, says what you can safely try, and says when to call.
Then the guides
The longer pieces are specific to the First Coast: retrofitting central air into Riverside and Springfield bungalows, JEA’s rebates and the smart thermostat program, salt exposure from Mayport to Jacksonville Beach, rooftop units for Southside offices, duct sealing in the 2000s Mandarin subdivisions, San Marco tidal flooding and air handler height, well water in Nassau County, package units for rural Baker County homes, commercial maintenance contracts in Duval, and how to choose among the hundreds of HVAC companies advertising here.
Why these topics and not others
Because they’re the questions the dispatchers hear from Jacksonville, not the questions a national content calendar generates. A city with record river flooding, nearly double the national lightning rate, a historic core never built for ductwork and a coastline eating condensers has its own curriculum. This library is that curriculum, written by people who drive up from Palm Coast to work on the results.
How this library is organized
Is there a guide about getting central air into a Springfield or Riverside house?
Yes. The retrofit guide covers the historic core specifically: what fits in a bungalow attic, where returns can go without cutting plaster, and when a ductless system is the better answer.
Do the problem pages tell me when something is safe to try myself?
Each one separates what a homeowner can safely check, like a breaker, a float switch or a filter, from what needs a technician. If the page says stop, stop; a compressor run on a bad capacitor doesn’t recover.
Will the JEA rebate guide be updated when the next program year opens?
That’s the intent. The 2026 program closed on October 10, and the guide will carry the new dates and thresholds once JEA publishes them.
- ProblemBreaker tripsOne reset is allowed. What a tripping breaker means in a lightning city, and what we find when we open the panel.
- ProblemFrozen coilFrost on the lines in 95-degree heat. What to do right now, and what we find when we open it up.
- ProblemHigh electric billNothing changed in the house but the JEA bill jumped. The HVAC causes, in the order we find them.
- ProblemHouse feels humidThe thermostat is satisfied, your skin isn't. Where Jacksonville's moisture comes from and what removes it.
- ProblemNew noisesFour sounds, four different causes. Which ones can wait for morning and which ones mean turn it off now.
- ProblemShort cyclingOn for four minutes, off for six, all afternoon. Why it happens in newer Jacksonville houses and what fixes it.
- ProblemWarm or weak airThe system is running, the air isn't cold. What it usually is in Jacksonville, by house type.
- ProblemWater leakWater around the air handler or a ring on the ceiling. Why waiting is expensive here and what we do about it.
- GuidePackage unitsWho a package unit suits, how it works, how it's sized for a manufactured home, and what the rebate needs.
- GuideCommercial contractsThe case for a maintenance contract on Duval's offices, clinics, shops and restaurants, with what a visit actually includes.
- GuideDuct sealingA cost-first guide to leaking attic ducts in 2000-era Mandarin houses, with a homeowner's check and the technician's part.
- GuideChoosing a contractorA homeowner's interview sheet for a crowded market, with the answers that should worry you.
- GuideJEA rebatesThe heating and cooling rebate, the smart thermostat credit and the tune-up program, in plain terms.
- GuideWell water & water heatersHybrid water heaters for Yulee, Callahan and Hilliard homes on Floridan Aquifer wells, from placement to the anode rod.
- GuideBungalow retrofitsThree ways to cool a 1920s house, compared honestly, with a checklist for the owner.
- GuideRooftop unitsRepair, plan or replace: a property manager's guide to aging rooftop package units in the Southside business parks.
- GuideBeaches salt guideHow far salt reaches, what to rinse yourself, and what to leave to the technician along the Duval coast.
- GuideFlood heightElevating air handlers and condensers on San Marco's flood-prone riverfront streets, with the signs, the costs and the fix.
Past the point of reading?
Call. The same people who wrote these pages answer the phone.