Heat pumps & ductless
Ductless mini-split installation and repair
A ductless mini-split is a heat pump with one outdoor unit and one or more wall, ceiling or floor heads connected by a small line set. It's the go-to fix for additions, garages, finished attics and older homes without ducts.
- Licensed local HVAC contractor
- Diagnosis and price before work
- Same-day appointments when a local contractor has an opening
- Free to call, no obligation
Each head is its own zone with its own remote, so you heat or cool only the rooms you use. One-to-one systems are the most efficient; multi-zone systems serve several rooms from one outdoor unit.
The most common service issues are dirty filters and coils in the heads, clogged condensate lines, and communication errors between indoor and outdoor units.
Ductless Mini-Split at a glance
- Category
- Heat pumps & ductless
- Urgent service
- Usually scheduled
- Who does the work
- An independent, licensed HVAC contractor
- Quote
- Given after diagnosis, before work starts
Signs you need ductless mini-split
- Room additions or garages with no ducts
- One room always too hot or cold
- Window units you'd like to retire
- Head dripping water or blinking an error code
- Musty smell from an indoor head
What the technician does
- 1
Room-by-room sizing
Each head is sized for its space; oversizing causes short cycling and poor humidity control.
- 2
Placement
Heads placed for airflow and drainage, outdoor unit where it can drain and stay clear of snow.
- 3
Installation
Small wall penetration, line set and communication wire, condensate drain or pump.
- 4
Commission
Pressure test, vacuum, charge verification and a walkthrough of the controls.
What affects the cost
Prices are set by the contractor after diagnosis. These are the factors that move the number most:
- Number of zones
- Head style (wall, ceiling cassette, ducted slim)
- Line set length and routing
- Electrical work
- Condensate pump needs
Safe to check yourself
- Rinse the head's washable filters monthly in heavy use
- Keep the outdoor unit clear
Leave to a pro
- Opening the head to clean the blower wheel (it needs a cleaning kit and care)
- DIY pre-charged kits that void warranties in many cases
Ductless Mini-Split FAQ
How many rooms can one mini-split serve?
A single-zone system serves one space. Multi-zone outdoor units commonly run two to five indoor heads, depending on model and capacity.
Do mini-splits need maintenance?
Yes. Clean the filters regularly and have the heads and coils professionally cleaned every one to two years to prevent mold and loss of capacity.
Are mini-splits good for heating?
Yes. They are heat pumps, and many models are rated for cold-climate heating.
How much wall space does a mini-split head need?
Most wall-mounted heads are about 30–40 inches wide and need clearance above for airflow. Ceiling cassettes and slim ducted units are options where walls won't work.
Are mini-splits noisy?
Indoor heads are usually very quiet, often around the level of a whisper on low speed. Outdoor units are generally quieter than conventional condensers.
Can one outdoor unit run several rooms?
Yes. Multi-zone outdoor units can serve several indoor heads, though one-to-one systems are usually more efficient.
Why is my mini-split head leaking water?
A clogged condensate line, a failed condensate pump or a dirty head are the usual causes. Turn it off and have the drain cleared.
Do mini-splits work as the only heat?
In many climates, yes. Cold-climate models can heat a well-insulated home on their own; colder areas often keep a backup.
Last reviewed . General information, not a diagnosis of your system.
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