What a mini-split saves over a Gainesville summer, and the three questions that follow

The season math, in plain terms

Take a 1920s bungalow in Pleasant Street with a garage apartment out back that a Santa Fe College student rents. The apartment runs a window unit that rattles, drips on the step, and gets left on 68 while the tenant is in class. The landlord pays GRU. From mid-May through late September that window unit runs flat out, and the bill reflects it.

The alternatives are two. Extend ducts from the main house, which in a 1920s wood-frame home with a retrofit attic system means long runs, a bigger air handler and a lot of plaster disturbed. Or hang a ductless mini-split: one wall head, one small outdoor unit, a three-inch hole through the wall. The mini-split costs more than another window unit and far less than the duct extension, runs on a fraction of the window unit’s electricity, and typically repays the difference in a couple of summers. We will not fake a dollar figure; your GRU history and the unit’s rated efficiency give a real one on the estimate.

That is the whole decision for most Gainesville callers. The Florida room added to a Haile Plantation house in 2004, the bonus room over a Westchester garage, the back bedroom in an East Gainesville house with one failing register, the home office carved out of a Duckpond sunporch: each is a space the central system never reached well, and each pencils out the same way.

The three questions that follow

Is it loud?

Indoor heads are quieter than a ceiling fan on low; the compressor is outside, and modern inverter compressors ramp rather than slam on. The sound people notice is placement-related: a head over the bed, or an outdoor unit bracketed to a bedroom wall. We mount outdoor units away from sleeping rooms, and in the historic districts we keep them off the street-facing elevation.

Will it leave the room sticky?

Not if it is sized right. Gainesville’s August dew points sit in the low 70s, and a head that is too large reaches the setpoint in minutes and shuts down before it has dried the air. Properly sized, it runs long and slow and the room feels drier than it did on the window unit. In a garage apartment with a bare slab and no vapor barrier, we may add a small dehumidifier; we tell you that on the estimate, not after.

What does it do for air quality?

Every head carries a washable filter and the current Lennox models add finer filtration. That helps with the late-January oak and pine pollen that coats this town, but a mini-split moves only the air in its room. It is not a substitute for a whole-house filter cabinet on the main system, and it will not fix a musty crawlspace.

Where we put them in Alachua County

• Garage apartments and accessory dwellings behind homes in Duckpond, Pleasant Street and the Southeast district, where rental demand makes them common.
• Florida rooms and lanai enclosures in Haile, Blues Creek and Westchester.
• Whole small houses in the historic districts that have never had ducts.
• Home offices and bonus rooms for the UF and Shands remote-work crowd.
• Small commercial spaces: a server closet in a Progress District lab, a back office behind a shop on Newberry Road.

What an install involves

A half day for a single zone, usually a full day for multi-zone. Indoor head on the wall, line set through one small penetration, outdoor unit on a pad or wall bracket, a dedicated circuit from the panel, and a condensate drain routed somewhere the aquifer-hard water will not stain. We vacuum the lines, charge to spec and show you the remote before we leave.