Size a head for each room and see the total your outdoor unit must serve.
How it works
Finds each room's capacity from the EPA room air conditioner chart, applies your sun adjustment, then rounds up to a common head size and adds them together.
Before you order
- Do not oversize a head just to be safe, since small inverter heads run longer and handle humidity better.
- Look at cold-climate heating capacity if you rely on the unit in winter.
- Multi-zone outdoor units have their own connected-capacity limits, so check the spec sheet.
Common questions
Why are head sizes rounded up?
Mini splits come in standard sizes, so you pick the next one that covers the room.
Does this cover heating?
No. Heating capacity falls in very cold weather, so check the unit's heating output against your heat loss.