Ductless mini-splits have gone from a niche product to something we install regularly around the Fox Valley. If you have a room that's always too hot or too cold and running new ductwork to it would mean tearing up finished space, a mini-split is often the cleanest answer.
How they work. A mini-split has two parts: a compressor unit outside and one or more air handlers mounted inside — usually high on a wall. They're connected by a small conduit carrying refrigerant lines, a power cable, and a condensate drain, which needs only about a three-inch hole through the wall. No ductwork at all, which is the whole point.
Where they make the most sense. Additions and sunrooms that were built without extending the duct system. Converted attics and finished basements where running trunk lines isn't practical. Garages and workshops you want to use year-round. Older homes with radiators or boilers that have heat but no central air. And any single room that has always been the problem room — the bedroom over the garage is the classic case.
They heat, not just cool. This is the part people are often surprised by. A mini-split is a heat pump: it cools in summer and reverses to heat in winter. The reasonable question in Illinois is whether that works when it's genuinely cold, and with older equipment it didn't work well. Modern cold-climate models are a different story — they produce useful heat well below zero, though it's still worth having a backup heat source for the worst stretches of a Midwest January.
Efficiency. Because there's no duct system, you avoid the losses that come with it — leaky and uninsulated ducts can waste a substantial share of the energy a central system produces. Mini-splits also run at variable speed rather than cycling hard on and off, which uses less energy and holds a steadier, more comfortable temperature.
Zoning is the underrated benefit. One outdoor unit can feed several indoor heads, each with its own thermostat. You can keep a bedroom cool at night without cooling the entire house, which matters in homes where people disagree about the thermostat.
The honest downsides. The indoor head is visible on the wall, and not everyone likes how it looks. Upfront cost per room is higher than extending existing ductwork when extending is easy. And the filters need cleaning regularly — roughly monthly — or performance drops off noticeably. That part is easy but it does need doing.
When central air is still the better choice. If you already have good ductwork and you're replacing an aging central system, a conventional furnace and AC is usually the more economical path. Mini-splits shine where ductwork doesn't exist or can't reasonably be added.
PMV Heating and Cooling installs and services ductless mini-splits throughout St. Charles, Elgin, Algonquin, Huntley, and the western suburbs. Call (630) 415-8030 for a free estimate on your problem room.