HVAC comparison
Mini Split vs Central Air: Cost Comparison
The real question is usually whether the house already has usable ductwork. That single fact moves the cost of both options by thousands and decides most of these jobs.
Mini split
$3,000 to $12,000 installed
Central air
$5,000 to $14,000 installed
| Feature | Mini split | Central air |
|---|---|---|
| Installed cost | $3,000 to $12,000 | $5,000 to $14,000 |
| Needs ductwork | No | Yes |
| Cost if ducts must be added | Not applicable | Add $3,000 to $10,000+ |
| Zoning | Per head, built in | Needs dampers and controls |
| Efficiency | Very high, no duct losses | Good, duct losses apply |
| Indoor appearance | Wall or ceiling units visible | Vents only |
| Also provides heat | Yes, heat pump | Only with a furnace or heat pump |
| Filtration | Per unit, basic | Central filter, whole house |
Mini split
- No ductwork needed, so it suits old houses and additions
- Room by room zoning without extra controls
- No duct losses, which raises real world efficiency
- Provides heating as well as cooling
- Indoor heads are visible on the wall or ceiling
- Cost climbs quickly with each additional head
- Each unit has its own filter to clean
- Whole-house humidity control is less consistent
Central air
- Nothing visible except vents
- Whole-house filtration and humidity control
- Single system to service
- Lower cost where good ducts already exist
- Needs ductwork, which is expensive to retrofit
- Duct leakage wastes conditioned air
- Conditions the whole house whether rooms are used or not
- Zoning requires extra equipment
The verdict
Choose a mini split for a house with no ducts, a converted garage or attic, an addition, or when you want to condition two or three rooms rather than the whole house. Choose central air when good ductwork already exists and you want whole-house filtration and nothing visible on the walls. Before choosing either, have a contractor perform a load calculation on the house rather than sizing from square footage, because oversized equipment short cycles, fails to remove humidity and wears out early.
If a ductless system is the answer, the next question is whether you install it yourself: our MRCOOL DIY 5th Gen mini split review covers what the pre-charged line set removes and what still needs a licensed electrician and a permit.
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View on AmazonFrequently asked questions
Is a mini split cheaper than central air?
Usually yes when ductwork does not already exist, because retrofitting ducts into a finished house can add $3,000 to $10,000 or more. Where good ducts are already in place, central air is often the cheaper installation. Count the heads you actually need for a mini split, since a four-head system in a large house can cost more than a central system.
How many mini split heads do I need?
One per zone you want to control independently, which usually means one per main living area and one per bedroom you want conditioned. Open plan spaces can often be covered by a single larger head. A contractor should size this from a load calculation rather than a rule of thumb, since an oversized head cools quickly, shuts off and leaves the room clammy.
Do mini splits provide heat as well?
Most are heat pumps and provide both heating and cooling, and modern cold-climate models continue producing useful heat well below freezing. In very cold regions a backup heat source is still commonly specified. Check the rated performance at your design temperature rather than at the mild rating on the brochure.
Do I need a permit for HVAC work?
Almost always. Refrigerant work is regulated, electrical connections need to meet code, and most jurisdictions require a permit and inspection for adding or replacing HVAC equipment. Use a licensed contractor. Unpermitted HVAC work turns up at resale and can complicate a sale or an insurance claim.