The simple rule
A zone is a space served by one indoor head with its own thermostat. To count zones, walk your home and mark each space you want to control on its own. Walls and doors are the key: air from one head does not reach well around corners or through closed doors.
| Space | Zones |
|---|---|
| Open kitchen, dining, and living area | Often one larger head |
| Each closed bedroom | One each |
| Office, bonus room, or finished basement | One each |
What changes the count
Layout
Open floor plans need fewer zones because one head covers a large connected space. Chopped-up older homes need more.
How you use rooms
If you want a cool bedroom at night without cooling the whole house, that bedroom is its own zone. Independent control is the whole point of going ductless.
Putting it together
Add up the spaces, then match them to a multi-zone outdoor unit that supports that many heads, or use single-zone systems for one or two rooms. Size each head to its room as you go.
Shop multi-zone mini splits
Browse systems by the number of zones they support.
Common zone-count questions
Can one head cool two rooms?
How many zones do most homes use?
Can I mix room sizes on one system?
Is more zones always better?
25 years sizing and shipping HVAC systems to homeowners and contractors.
