Why Choose a Ductless Mini Split?
A ductless mini split system (also called a mini split) is an HVAC solution that includes an outdoor unit housing a compressor/condenser and one or more indoor air-handling units. It provides both heating and cooling for a space without relying on ductwork.
You might choose a mini split if:
- Your building lacks existing ductwork (e.g., historic homes, room additions)
- You want to add heating/cooling to a specific zone that’s underserved by your main system
- Tying into existing ducts would be difficult or prohibitively expensive
- A single-zone mini split system has one indoor unit and covers a single area — ideal for adding heating/cooling to a newly constructed or isolated space.
- A multi-zone system has multiple indoor units (up to eight in some cases) connected to one outdoor unit, allowing independent temperature control in different zones for greater efficiency.
- Wall-mounted: easy to install, mounted on a wall with refrigerant/wiring passing through the exterior.
- Floor-mounted: mounted low on a wall; good for rooms with high windows or unusual layout.
- Ceiling cassette: installed in the ceiling so mechanics are hidden; often offers better coverage and directional airflow.
- Concealed duct: uses short duct runs hidden in a closet, attic, or crawl-space.
- Suspended: suited for large open commercial spaces; mounted from ceiling and distributes air over a larger area.
Some of the additional components you might need include:
- Condensate pumps (to remove condensate when gravity drainage isn’t possible)
- Drain tubes for removing indoor unit condensate away from the structure
- Line sets (copper refrigerant tubing connecting indoor and outdoor units) — multi-zone systems will have separate line sets per indoor unit.
- Line set covers (protect and conceal tubing and wiring; they are often paintable to match siding/trim)
- Mini split wiring (14/4 stranded conductor cables connecting outdoor and indoor units)
- Controls (to tailor output and maximize efficiency for specific zones)
Advantages include: flexibility in installation (especially where ductwork is impractical), zoned heating/cooling, and efficient use of space. The article also notes that because the system is different from traditional HVAC, the installation may require additional carpentry, electrical configuration, and expertise.
Drawbacks include: Potentially higher upfront cost or more complex installation compared to some standard systems, depending on site conditions.
Yes. Mini split systems can be installed in both commercial and residential buildings and are useful in new construction, retrofits, room additions, and situations with non-ducted heating systems.
Because mini splits allow for targeted heating and cooling in different zones, they can improve overall comfort by addressing spots that are underserviced by the main system and avoiding the loss or inefficiencies associated with ductwork. Proper selection and installation ensure that the system will deliver long-term comfort.
Key considerations include:
- The number of zones/areas you need to serve (single vs multi-zone)
- The layout of the indoor units (wall, floor, ceiling, concealed duct, suspended) that fits your space
- The accessories needed (drainage, wiring, line sets) and whether the space allows for gravity drain or needs a pump
- Installation conditions (existing structure, ease of access, ability to run line sets)
- Long-term comfort needs and budget planning (upfront and installation vs operational efficiency)
According to the article, First Supply offers a selection of mini split systems and accessories (line sets, controls, wiring, etc.). Working with a knowledgeable supplier and installer helps ensure that you select the appropriate system, accessories, and accessories for your unique application.