How mini-split installation works
A mini-split has an outdoor unit connected to one or more indoor air handlers by a small bundle of refrigerant lines, power and a condensate drain. Installers drill a small opening through the wall, mount the indoor unit, set the outdoor unit on a pad or bracket, connect and test the lines, and commission the system.
Because there is no ductwork, mini-splits are often used for additions, garages, sunrooms and older homes without ducts. Proper sizing and placement matter, because a unit that is too large or too small can run inefficiently or leave hot and cold spots.
Mitsubishi, Daikin and other mini-split brands
Several manufacturers make ductless equipment, including Mitsubishi, Daikin, Fujitsu, LG, Carrier and others. Differences include efficiency ratings, noise levels, warranty terms, controls and the availability of parts and trained installers in your area.
Some manufacturers have authorized or certified installer programs, and warranty coverage can depend on correct installation. If you want a specific brand, ask any contractor whether they are authorized or certified for it and ask for proof. We can't verify a contractor's brand certifications.
What affects mini-split installation cost
Prices vary widely by location and project, so be wary of any single number. Ask contractors to itemize their quotes so you can compare like with like.
- Number of zones (indoor units) and the capacity of each
- Equipment brand, efficiency level and features
- Distance between indoor and outdoor units, and how hard the wall and refrigerant-line routing is
- Electrical work such as a dedicated circuit or panel upgrade
- Condensate drainage, mounting hardware and any permits required locally
- Warranty terms for equipment and labor
Mini-split vs central air
Central air distributes cooled air through ducts to the whole house and usually suits homes that already have good ductwork. Mini-splits suit homes without ducts, additions, and spaces where you want separate temperature control by room.
Ducts can lose energy if they are leaky or poorly insulated, and ductless systems avoid that loss. On the other hand, covering a whole house may require several indoor units, and some people prefer the look of vents to wall-mounted units. A load calculation from a qualified contractor can help you compare options for your home.
Mini-splits for a garage, sunroom or home addition
These spaces are often poorly served by existing ducts, and extending ductwork can be costly or impractical. A single-zone mini-split can condition one space independently.
Insulation, windows and how the space is used affect the right size. A contractor should assess the room instead of choosing a unit from square footage alone.
Questions to ask before you hire
We're a referral service, not a contractor. We can help you look for independent local contractors, but we can't promise availability, pricing or response times.
- Are you licensed in my state or city, and can you share the license number?
- Are you authorized or certified to install the brand I'm considering?
- Will you perform a load calculation and place the units based on it?
- What is included in the quote, and what is the labor and equipment warranty?
- Who pulls permits, and who handles any electrical work?