This is less a contest than a question about your house. Some homes are clearly better with central air, some are clearly better with ductless, and many Sacramento homes end up best served by both. Here is how to decide.
How each one works
- Central air uses one indoor unit, usually a furnace or air handler, and a network of ducts to deliver air to every room, controlled by one thermostat or a zoning system.
- Ductless mini-splits put an indoor head in each room or zone, connected directly to an outdoor unit by a small line set. Each head has its own control. Most are heat pumps, so they heat as well as cool.
Where central air wins
- Homes with good existing ducts. If the ducts are sound and sized reasonably, replacing central equipment is usually the lowest cost way to condition the whole house.
- Whole-house filtration. One filter treats the air for every room, which matters during wildfire smoke season. See filters and wildfire smoke.
- Appearance. Only grilles in the ceiling or floor. No wall units.
- Many rooms. A four bedroom home with one head per room adds up quickly in equipment.
Where ductless wins
- Homes with no ducts, like many older homes in Land Park, Curtis Park and old Roseville that were built with wall furnaces.
- Additions, converted garages and bonus rooms that the central system was never sized to handle.
- The one room that is always wrong. A west-facing bedroom or an upstairs office. See upstairs hot, downstairs cold.
- Room-by-room control. Different temperatures for different people, and no cooling empty rooms.
- Efficiency. No duct losses in a hot attic, and inverter compressors run at low speed most of the time.
Costs, in rough terms
A single-zone mini-split for one room costs far less than a whole central system. A whole-house ductless system with several heads can cost as much as or more than a central replacement. Numbers are in mini-split installation cost and what a new HVAC system costs. For a quick range, the cost calculator takes about a minute.
The downsides to know
Central air: duct leakage in the attic can waste a large share of the cooling, and one thermostat means compromise between rooms. See duct sealing versus replacement.
Ductless: heads on the wall, filters that need rinsing every few weeks in heavy use, and installation quality matters enormously. A poorly sloped drain or a bad flare connection causes most of the problems we see. See how to clean a mini-split.
The common Sacramento answer: both
Many homes here have a central system that works fine for most of the house and one or two spaces it never handles. Adding a ductless head to those spaces is often cheaper and more effective than enlarging the central system or rebuilding the ducts.
How to decide
- Are the existing ducts sound? If yes, central equipment is usually the base.
- Which rooms are uncomfortable, and why?
- Would one or two heads solve those rooms?
- How long will you stay, and how much do you value room-by-room control?
What we do
We check the ducts, measure the problem rooms and size both options before recommending anything. Estimates are free. See our ductless mini-split page and what size mini-split you need.
Frequently asked questions
Is a mini-split better than central air?
It depends on the house. Central air is usually better with good existing ducts and many rooms. Ductless is better for homes without ducts, additions, garages and problem rooms.
Are mini-splits more efficient than central air?
Often, because there are no duct losses and inverter compressors modulate. The difference is biggest when central ducts run through a hot attic and leak.
Is a whole-house mini-split system cheaper than central air?
Not usually. A single zone is much cheaper, but several heads for a whole house can cost as much as or more than a central replacement.
Can I add a mini-split to a house with central air?
Yes. Adding a head to a room the central system never handles is a common and cost-effective fix.
Do mini-splits filter the air as well as central systems?
Their filters mainly protect the unit. Central systems can use higher rated filters that treat the whole house, which matters during wildfire smoke season.
Which is better for a converted garage?
Usually a mini-split, because the central system was not sized for the space and extending ducts into a garage is often impractical.