Mini-Split vs Central Air

A mini-split connects an outdoor unit to one or more wall or ceiling units with refrigerant lines, needing only a small wall opening and no ducts. The Pacific Northwest National Laboratory notes ducts running through unconditioned spaces can lose over 30 percent of heating and cooling energy to leaks and conduction.

Central air cools the whole house through ducts from one system, which is simple when ducts are in good shape. In both cases installation quality matters as much as the equipment: oversizing, poor refrigerant charge and leaky ducts all cut efficiency, so insist on a proper load calculation.

Mini-Split vs Central Air side by side

Last verified October 2026. Typical values; individual animals, products and local prices vary.

Which one fits you

Mini-Split

• Your home has no ducts, such as an older house or an addition
• You want to cool or heat only the rooms in use with separate thermostats
• Existing ducts are leaky or in a hot attic
• You want heating and cooling from one heat pump system

Central Air

• Good ducts already run through your home and are sealed
• You want one system cooling every room evenly
• You do not want indoor units on walls
• Your house is large and open to the same temperature throughout

How this works

The quiz compares your ductwork, control preferences and home layout against the main trade-offs. It does not price either system, because costs vary by region, house and installer. It also does not account for climate zone, home size or local utility rebates, which can change the balance in a real project.

Quality of installation affects both systems more than brand. Use the result to shape contractor quotes, and get a load calculation and duct inspection before deciding. Ask each contractor how they size the system and test the ducts. Brand matters less than sizing and installation quality.

Where these numbers come from

The figures and defaults on this page are based on:

• PNNL Building America Solution Center: Ductless (Mini-Split) Heat Pumps, Gives duct loss figure, unit counts, drawbacks, maintenance and sizing guidance. (checked October 2026)
• ENERGY STAR: Ductless Heating and Cooling, Describes mini-split zoning, no-duct design and cold-climate performance. (checked October 2026)
• U.S. Department of Energy FEMP: Purchasing Energy-Efficient Residential Central Air Conditioners, Notes installation problems and lifetime assumptions for central air. (checked October 2026)

Planning guide. Costs and performance vary by home and installer, so get a load calculation and several quotes.