Practical BTU ranges by room and project.
Start with the calculator, then use these guides to understand the common size classes for bedrooms, open areas, garages, and larger whole-home screens.
DIY Mini Split Installation, 2026 Edition
The full walkthrough: pre-charged kits vs. standard installs, tool list, electrical, permits, the eight install steps, common mistakes, and when to call a pro mid-project.
Read the guideWhat Size Mini Split Do I Need?
A practical homeowner guide to mini-split BTU sizing, including the factors that move a room up or down one standard system size.
What Size Mini Split for 500 Sq Ft?
Most 500 sq ft rooms land near the 9k to 12k BTU class, but insulation, sun, ceiling height, and layout matter.
What Size Mini Split for 800 Sq Ft?
An 800 sq ft space usually points to the 15k to 18k class, with 12k possible only in unusually easy conditions.
What Size Mini Split for 1,000 Sq Ft?
A 1,000 sq ft area usually lands near 18k to 24k BTU, with layout and air distribution becoming as important as the number.
What Size Mini Split for 1,500 Sq Ft?
A 1,500 sq ft project often moves beyond a simple single-zone answer. Use the BTU range as a screen before getting a load calculation.
What Size Mini Split for a Garage?
Garage mini-split sizing depends heavily on insulation, door exposure, sun, and how you use the space.
What Size Mini Split for 400 Sq Ft?
A 400 sq ft room usually points to the 9k BTU class, with 12k only justified in unusually hard conditions.
What Size Mini Split for 600 Sq Ft?
A 600 sq ft space usually fits the 12k BTU class, with 9k possible for easy rooms and 18k reserved for hard cases.
What Size Mini Split for 1,200 Sq Ft?
A 1,200 sq ft project usually lands around 24k BTU total. Whether one head can serve it depends almost entirely on layout.
What Size Mini Split for 2,000 Sq Ft?
A 2,000 sq ft project is whole-home territory. Use the BTU range as a sanity check before getting a real load calculation.