What a mini-split is
DOE describes ductless mini-split heat pumps as air-source heat pumps "that can be installed in homes or additions without ducts." They're small and "offer flexibility for zoning or heating and cooling individual rooms" (DOE Energy Saver Guide).
A typical system has an outdoor unit, one or more indoor heads (wall, ceiling or floor), and a small line set running between them. Many are heat pumps, so they can heat on cool nights too. See Heat Pumps in Brevard.
Good fits
Additions and bonus rooms. Extending existing ductwork to a new room can overload the central system or leave the room starved for air. A separate mini-split gives the room its own control.
Garages. Workshops, home gyms and converted garages are common mini-split projects. Carrier notes that garages are often less insulated than the main living areas. It recommends checking insulation and sealing air leaks before installing, and matching capacity to the garage's size, insulation and load (Carrier: Ductless Mini-Split for Garage).
There's also a reason not to just extend the house ducts into the garage. The DOE Building America Solution Center warns that garage contaminants such as "gasoline fumes, auto exhaust fumes, paint, and other chemicals" can be drawn into the home through ducts. It says HVAC ducts and air handlers should not be located in the garage (Building America Solution Center). A ductless system serving only the garage avoids tying its air to the house.
Enclosed Florida rooms. A room with real walls, windows and a door, often a former porch, can work well. Lots of glass means a lot of afternoon heat, so the room needs its own load calculation. See Sizing an AC for Florida Humidity.
Condos and small businesses. Mini-splits can suit condos where ductwork is limited, and small offices or shops in light commercial spaces. Condo projects need association approval. See Condo AC Replacement.
Poor fits: the open screened lanai
A screened lanai or pool cage is, in effect, outdoors. Screens keep bugs out, not air. Any cooled air blows away, and humid outdoor air keeps flowing in, so the system would run constantly without making the space comfortable.
If you want to use a lanai in summer, ceiling fans make people feel cooler. DOE notes fans cool by creating a wind-chill effect. To cool the space itself, it would need to be enclosed: walls, windows and insulation, built to code and permitted. That turns it into a Florida room, and then a mini-split can be a good fit.
Plan for condensate
Mini-splits pull water out of the air, and that water has to go somewhere. The Florida Building Code, Mechanical, Section 307.2.1, requires condensate from all cooling coils to be "conveyed from the drain pan outlet to an approved place of disposal." It also says condensate must not discharge where it causes a nuisance (2023 FBC Mechanical, Ch. 3).
In practice, the drain route is part of the design. It may run by gravity or need a small pump, and the drain line needs regular care. See the Space Coast AC Maintenance Checklist.
Plan for a permit
The Florida Building Code says anyone who intends to install or replace a mechanical system regulated by the code "shall first make application to the building official and obtain the required permit" (2023 FBC Building, Ch. 1). Depending on your address, that's your city or Brevard County. A new mini-split also needs electrical work, which is licensed work. OBC Air & Heat pulls the mechanical permit for mini-split installs and coordinates the electrical work.
Beachside? Ask about coastal protection
Outdoor mini-split units face the same salt air as any condenser. Some manufacturers offer anticorrosion fin coatings and seacoast models. See Coastal AC Units on the Space Coast.
The next step
We look at the space first: how it's built, how much glass it has, where the indoor and outdoor units can go, and where the condensate can drain. Then you get a written quote. See ductless mini-splits.
- Start My Estimate
- Ask Mikey (Mikey is free)
- Call (321) 405-1806
Firefighters, law enforcement, EMS and paramedics, healthcare workers, teachers, ministry, government employees and military (active and veterans) can get 10% off the total, up to $2,500, on new units and repairs through our Local Heroes program. Family members of eligible heroes qualify too. It can't be combined with other offers.
Frequently asked questions
Can I put a mini-split in my Florida garage?
Often, yes, especially in a garage used as a workshop, gym or living space. Insulating and sealing the garage first helps the system keep up. A ductless unit also avoids running house ducts into the garage, which DOE guidance warns can pull fumes into the home.
Can a mini-split cool a screened lanai?
Not effectively. Screens let outdoor air flow freely, so cooled air escapes. Ceiling fans help people feel cooler. To actually cool the space, it would need to be enclosed and insulated.
Is a mini-split good for a Florida room or addition?
Usually. An enclosed room with walls, windows and a door is a common, good fit. Rooms with lots of glass need a careful load calculation.
Do mini-splits need a drain?
Yes. Florida's mechanical code requires condensate to be carried to an approved place of disposal, so the drain route is part of the installation plan.
Do I need a permit for a mini-split in Brevard County?
Installing a mechanical system regulated by the Florida Building Code requires a permit from your local building department, either your city or Brevard County.
Do mini-splits heat too?
Many are heat pumps, so they can heat on cool nights as well as cool.
Sources
- DOE Energy Saver Guide
- Carrier: Ductless Mini-Split for Garage
- Building America Solution Center
- 2023 FBC Mechanical, Ch. 3
- 2023 FBC Building, Ch. 1
Written by OBC Air & Heat, Space Coast, Brevard County, FL. State Certified Air Conditioning Contractor, License No. CAC1825377. General information only; your system and home are reviewed before any recommendation.
