What Size Mini-Split Do I Need?
A room-level sizing and planning-cost calculator for ductless hot spots: garages, additions, lanais, and the one bedroom that never cools.
Mini-split sizing starts with room square footage, ceiling height, sun exposure, insulation, and whether the room is a garage or conditioned space.
Why this matters
Use this when a whole-home replacement is not the problem and one Florida room needs dedicated cooling.
The public-safe rule
This page gives an educational planning result. Final quote, rebate, payment, package, and installer details wait until the customer and home record are saved inside the assessment flow.
Start exact assessmentRun the numbers.
9,000 BTU/h mini-split planning size
Plan around a 9,000 BTU ductless system for this bedroom.
Planning size
9,000 BTU/h
Tons equivalent
0.8 tons
Planning low
$3,800
Planning high
$6,500
Room-level mini-split sizing is sensitive to sun, insulation, garage doors, glass, and whether the room is actually conditioned.
For garages and lanais, verify insulation and code requirements before choosing equipment.
For multi-zone systems, compare total line-set length and outdoor-unit capacity, not just room BTUs.
This is a planning estimate, not a final quote or engineering report. Field conditions, permits, equipment selection, ducts, electrical work, and installer verification can change the result.
How this estimate is grounded.
The visible result, assumptions, and schema match. Structured data does not claim anything that is not also shown on the page.