Ductless Mini-Split Heating and Cooling
A ductless mini-split heats and cools a specific space without ductwork — which makes it the practical answer for additions, attic and basement conversions, sunrooms, garages, and older buildings where running ducts would mean tearing apart plaster.
Tell us what the system is doing when you call — that decides which truck and which parts head to your address.
Where a mini-split makes sense
Room additions and finished attics are the classic case. The existing furnace and air conditioner were sized for the original house, and pushing them to cover new square footage usually leaves the new space uncomfortable and unbalances the rest of the building. A dedicated ductless system handles the addition on its own thermostat without touching the existing equipment.
Older Chicago and Park Ridge homes with radiator heat and no ductwork are the other common case. Rather than losing closet space to new duct chases, one outdoor unit can serve several indoor heads, each controlled independently — cooling in summer and supplemental heat in the shoulder seasons and beyond.
Basements, converted garages, sunrooms and home offices round out the list. Any space that is consistently too hot or too cold while the rest of the house is fine is worth evaluating for a ductless zone.
Ductless heating, not just cooling
Mini-splits are heat pumps, so the same equipment heats. Cold-climate models hold useful heating capacity well below freezing, which makes them practical here for spaces that are hard to heat any other way, and they run efficiently at partial load rather than cycling hard on and off.
For a whole house we usually treat ductless heating as a complement to the main system rather than a replacement, and we will say clearly which role the equipment can play in your building instead of overstating it.
System selection and zoning
Selection starts with a room-by-room load calculation. Oversizing is the single most common mini-split mistake — an oversized head short-cycles, does a poor job removing humidity and leaves the room feeling clammy even at the right temperature.
Single-zone systems pair one outdoor unit with one indoor head. Multi-zone systems run several heads off one outdoor unit, which is tidier outside but means the whole system shares one compressor. Indoor options include the familiar wall-mounted head, ceiling cassettes, floor-mounted units and slim ducted air handlers that hide in a soffit and feed two or three rooms through short duct runs.
Placement matters as much as capacity: where the head goes, where the outdoor unit sits, how the line set and condensate are routed, and how the whole assembly looks when it is finished.
Installation and repairs
Installation covers mounting, core drilling, line set routing, electrical, a proper vacuum and charge, condensate management, and commissioning each zone. Careless line-set routing and skipped evacuation are why some mini-splits fail early, so those steps are not rushed.
On the repair side we handle systems that stop heating or cooling, error codes on the indoor display, ice on the outdoor unit, water dripping from an indoor head — usually a blocked condensate drain or line — refrigerant leaks at flare connections, failed control boards and communication faults between indoor and outdoor units.
Maintenance
Mini-splits need their own routine. The washable filters in each head should be cleaned regularly, and the indoor blower wheel and coil need periodic professional cleaning because a ductless head pulls air directly from the room. Condensate drains need checking, and the outdoor unit needs clearance and a clean coil.
Mini-split maintenance is the equipment itself: filters, coils, blower wheels, drains and refrigerant charge.
Qualifying installations may include our lifetime product, labor and parts warranty program; terms and eligibility apply.
Where we do this work
We work from 2093 Rand Rd, Des Plaines, IL 60016 and cover Cook and DuPage county communities plus Chicago. Every community is listed on our service areas page, or start with one of these:
Questions we are asked about this service
Can a mini-split heat as well as cool?
Yes. Mini-splits are heat pumps, and cold-climate models hold usable heating capacity well below freezing. For whole-house heating in this climate we usually design them alongside a primary heating system rather than as a full replacement.
How many indoor heads do I need?
It depends on the layout and a room-by-room load calculation, not on square footage alone. Open plans can often be served by one well-placed head; separated rooms usually each need their own zone.
Water is dripping from the indoor unit. What is wrong?
Almost always a blocked condensate drain or line, sometimes a unit that is not pitched correctly or a frozen coil from a dirty filter. Shut the unit off and call — dripping condensate damages walls and floors quickly.
Do mini-splits need maintenance?
Yes. Clean the filters regularly yourself, and have the coil, blower wheel and condensate drain serviced periodically. Because the indoor head pulls air straight from the room, the blower wheel loads up faster than people expect.
Related services
Guides worth reading
Every article is on our plumbing and HVAC guides page.
Schedule this service
Call 847-550-3322 for Des Plaines and the suburbs, or 773-250-6060 in Chicago. You can also request service online.