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A Hobe Sound homeowner had a beautiful screened-in Florida room on the back of her house, the kind of space that should have been her favorite room to spend time in. Big windows, view of the live oaks in the backyard, perfect spot for morning coffee or afternoon reading. But for about seven months of the year, it was completely unusable. By April it was already too hot to sit out there in the afternoons. By July it was basically a sauna. By August it was a furnace. She'd given up on the room for most of the year, and what should have been her favorite space had turned into a glorified storage closet with windows.
Her first instinct was to extend the central AC ductwork to include the Florida room. We talked her through why that's almost never the right move on the Treasure Coast. The central system was sized for the original interior load, and adding another 200 square feet of high-load conditioned space (Florida rooms have huge solar gain through the windows and minimal insulation in the framing) would have pushed the system past its design capacity. The home would have ended up with marginally cool Florida room AND a struggling central system trying to keep up with the rest of the house. On top of that, running ductwork from the main trunk out to the Florida room would have meant cutting through walls, fishing duct through the attic, and probably some drywall repair afterward. A bigger budget, more disruption, and a worse end result.
A ductless mini-split is designed for exactly this scenario. A single-zone system sized to the specific load of one room, with its own dedicated outdoor condenser, its own indoor head unit, and its own thermostat. No ductwork. No structural work. No drywall repair. Set up to be a complete cooling solution for that room without touching the rest of the house. We sized a 12,000 BTU single-zone system to her room's actual load, factoring in the western exposure, the late-afternoon sun coming through the big windows, and the minimal insulation in the screened porch framing.
The whole install took less than a day. We came out first thing in the morning. The wall-mount indoor unit went up above the doorway between the Florida room and the kitchen, so the air would distribute through both spaces and she could close the door to the Florida room when she didn't want to condition it. The outdoor condenser tucked into a side corner of the house on a small concrete pad, well out of sight from the street. Importantly, we used coastal-grade coil protection on the outdoor unit, which matters a lot on Hobe Sound because salt air from the Atlantic shortens the life of any unprotected outdoor condenser. Standard coil treatment on a Hobe Sound install will get you maybe six or seven years before corrosion sets in. Coastal-grade coil treatment plus the protective housing gets you closer to the unit's full rated life.
Refrigerant line set ran through a small hole in the exterior wall, hidden behind a paintable line cover. Condensate line drained to grade. Electrical tied into the existing panel through a dedicated breaker. We commissioned the system, walked the homeowner through the remote control and the wall-mount controller, set the schedule, and were off the property by mid-afternoon.
She can use the Florida room from January through December now. Morning coffee out there in winter. Afternoon reading in summer. Evening drinks in the fall when the weather finally turns. And critically, she's not cranking up the central AC to try to compensate for an uncomfortable adjacent space, which means the rest of the house runs more efficiently too. Mini-splits are also among the most efficient ways to cool an isolated space because they run on inverter compressors that ramp up and down with demand instead of cycling on and off. The impact on her monthly power bill was barely measurable.
If you have a Florida room, a converted garage, a casita or in-law suite, a sunroom, a converted attic, or any other space that your central AC can't reach comfortably, a ductless mini-split is almost always the right answer. Faster install, lower cost, better efficiency, no structural disruption. Call First Aid Air Conditioning at 772-418-9787 for a free written estimate on a single-zone or multi-zone ductless system. Hearth financing available on qualified installs.
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