Ductless Room Comfort Tool
Mini-Split Sizing & Cost Calculator
Use this for garages, additions, lanais, one hot bedroom, converted spaces, or rooms that central ducts do not serve well. It is a planning tool, not a final ductless design.
Last updated June 5, 2026Reviewed by Climate Control Services team
Quick answer
What size mini split do I need and what might it cost?
A Florida mini-split planning estimate often starts around 22 to 25 BTU per square foot, then adjusts for ceiling height, sun, insulation, garage or lanai conditions, and number of zones. Installed cost depends heavily on access and line-set scope.
How This Calculator Works
Estimated BTU = room square footage x Florida room factor x ceiling, exposure, insulation, and use-case adjustments. Cost range = zone count and complexity planning bands.
Florida Factors to Review
Garages, west-facing rooms, lanais, additions, and rooms with poor return air can need more careful sizing because heat gain and humidity loads are different from conditioned living space.
Calculator FAQs
Can a mini split cool a Florida garage?
Often yes, but garage heat gain, doors, insulation, ceiling height, and usage can push sizing above a normal bedroom estimate.
Is one mini split enough for multiple rooms?
Sometimes, but doors, layout, airflow, and privacy needs matter. Multiple zones may be better when rooms do not share air well.
Why is mini-split installation cost variable?
Cost changes with zone count, wall access, line-set length, electrical work, condensate routing, mounting location, and finish details.
Estimate Disclaimer
Calculator results are planning estimates for homeowner education. They are not a Manual J load calculation, diagnostic finding, utility bill audit, financing approval, rebate confirmation, or installed-price quote. Climate Control Services can inspect the home, review equipment, and explain written options before work begins.