Why Choose a Ductless Mini Split?

Why Choose a Ductless Mini Split?

By: First Supply

A mini split is a ductless heating and cooling system that can be installed in commercial and residential buildings. Mini splits are named for their compact design and the fact that they provide both heating and cooling to enclosed spaces.

What is a Mini Split?

A mini split system includes an outdoor that houses a condenser and compressor, and an indoor unit that supplies conditioned air. This is a flexible HVAC solution that can work well in almost any construction application. Since these systems work without ductwork, they can be used to provide additional coverage in buildings with non-ducted heating systems, such as hydronic systems. Mini splits are also ideal for historical homes without ductwork as well as converted living spaces and room additions where tying into an existing ductwork system would be difficult or cost prohibitive.

Single-Zone Vs. Multi-Zone

As stated earlier, all mini splits have an indoor air-handling unit and an outdoor compressor/condenser. But there are single-zone and multi-zone systems.

Sealing ductwork will provide two major benefits:

  • Single-zone systems are perfect for adding heating and cooling to newly constructed rooms without ductwork, or to supplement underserved spaces in an existing system.
  • Multi-zone systems can include up to eight indoor units that function independently, so you can heat/cool specific areas for maximum efficiency.

Indoor Air Handling Units

The type of indoor unit(s) you select will depend on your layout and design preferences. The following are different types of indoor mini split air handlers:

Ceiling Cassette

Ceiling Cassette

These are installed in the ceiling so that the mechanics are hidden. They provide more coverage than wall units and some provide a way to direct air flow.

Concealed Duct

Concealed Duct

These use short duct runs to deliver air from a unit installed in a concealed area such as a closet, attic, utility room, or crawlspace.

Floor Mount

Floor Mount

These are mounted low on a wall and are a good solution for rooms with high windows or other layout obstacles.



These are best for large, open areas inside commercial or industrial spaces. They are attached to the ceiling and can move air over larger spaces.

Wall Mount

Wall Mount

These are the easiest to install because they simply mount on a wall where the connecting wire, refrigerant lines and drain tube enter from the outside.

Mini-Split Accessories

For the successful installation of a mini split HVAC system, you’ll also need several components and accessories. First Supply has a great selection of condensate pumps, line sets, split wiring, controls, and more. Every situation is unique, but the following list includes different accessories that may be required for your next mini split installation.

Condensate Pumps

These remove condensate in a mini split system. They include a reservoir with a drain pan to collect water, and a float switch to turn on the pump when the water reaches a certain level. If gravity can be used to drain condensate to the outside, a pump isn’t needed.
See Condensate Pumps

Drain Tubes

These flexible vinyl tubes are used to drain condensate collected from indoor air away from the structure being cooled.
See Drain Tubes

Line Set Covers

These conceal the line set(s) and wiring used for a mini split system. Covers offer protection from the elements and pest infestation. These are paintable to match siding or trim.
See Line Set Covers

Line Sets

These include a pair of copper tubes that connect the indoor unit (evaporator) and outdoor unit (condenser) and carries refrigerant from the condenser to the evaporator. Multi-zone systems require a line set for each indoor unit.
See Line Sets

Mini Split Controls

These allow you to tailor output and maximize efficiency by heating or cooling specific areas.
See Mini Split Controls

Mini Split Wiring

Mini Split wires connect the outdoor (condenser) to the indoor (evaporator). These 14/4 stranded conductor cables deliver electricity and control signals.
See Mini Split Wiring

Comfort Zone

A mini split system is significantly different from a traditional HVAC system and may require some additional carpentry, electrical configuration, and installation work. The differences result in some distinct Pros and Cons of Ductless Mini Splits that should be considered before committing to this type of system. Choosing the right heating and cooling system can play a huge part in the comfort that a property owner will enjoy in the long run. The information in this article should give you the tools you need to weigh the features and benefits of a mini split system against the negatives. Trust First Supply for all your mini split equipment, supplies, and information.

See all Ductless Mini Split Systems at First Supply!