Ductless or ducted? Mini-splits for the Jacksonville rooms central air never reached

Two ways to cool a Riverside sleeping porch

A 1925 Riverside two-story has an enclosed sleeping porch on the back, as many of them do. It is glass on three sides, it faces west, and the central system installed in the 1990s never got a duct to it because there was no path through the plaster.

Option one: extend the ducts. Open a ceiling, run a branch from the attic trunk, add a register and a return path, and accept that the main system now carries one more hot room. In a house whose trunk is already undersized, that usually means the porch stays warm and the rest of the house gets slightly worse.

Option two: a mini-split. One wall head, one small condenser behind the house, a three-inch hole through the wall, no ductwork. The porch gets its own thermostat and the main system is left alone.

That comparison plays out across the city: the garage conversion in Arlington, the bonus room over the garage in Intracoastal West, the detached studio in Springfield, the ocean-facing addition in Atlantic Beach. The mini-split wins most of them, with conditions.

The warranty page matters more than the glossy one

Mini-splits are precise, compact machines, and their warranties are specific. Before you compare efficiency numbers, read the terms, because they shape the whole decision:

• Installer requirements. Most manufacturers tie the full parts warranty to installation by a trained dealer and to registration within a set window. A unit bought online and installed by a handyman often carries a shorter warranty, or none on the compressor.
• Maintenance records. Several warranties expect documented annual service. In a climate where the indoor coil runs wet for eight months, skipping that service is also how mold shows up on the blower wheel.
• Corrosion exclusions. Coastal damage is frequently excluded unless the unit was specified with a coated coil. At the Beaches and on Amelia Island that line matters.

Ask for the specific warranty lengths on the lines Cook’s installs; they belong in writing on the quote. [[CONFIRM WITH JERRY]]

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Why maintenance decides a mini-split’s lifespan here

A mini-split head has a washable filter the owner cleans, and behind it a blower wheel and coil that the owner cannot reach. In Jacksonville the oak and pine pollen of February through May packs that coil, and the humidity of June through September keeps it damp. Left alone, the result is a musty smell from the head by the second summer and reduced capacity by the third.

Annual deep cleaning of the head, a condenser coil rinse (monthly at the coast), a condensate drain flush and a refrigerant check are the whole routine. Done, these systems run fifteen years and more. Skipped, they become the ductless unit a homeowner swears off after six.

Buying guidance: heads, zones and where the condenser sits

1. Size the head to the room’s load, not its square footage. A west-facing glass porch and an interior bedroom of the same size need different capacities.
2. Choose the head style for the room. Wall units for most spaces, ceiling cassettes where a wall head would look wrong in a historic room, slim ducted heads for a short run to two small rooms.
3. Go multi-zone when three or more rooms need help; a single condenser is quieter and cleaner on the house than three.
4. Put the condenser where it can be rinsed, off the ground on riverfront lots, and on a surge protector anywhere in Northeast Florida’s lightning belt.
5. Pair it with a heat pump mode. Nearly all mini-splits heat too, which covers the dozen freeze nights without strips.

We install Lennox ductless systems and service the major brands already on Jacksonville walls. The estimate is free, the system can be paid for monthly, and the Sunday rate matches the weekday rate if the only cool room in the house quits on a Sunday.