Find the right mini-split size for your room.

Choose the closest conditioned area below for a first-pass BTU range. For several rooms or a whole home, use the range as a budget screen and confirm the design with a room-by-room Manual J calculation.

Use your room details Estimate installation cost Planning a DIY installation? Read the install guide

Cornerstone guide

What 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. Start with the quick rule, then see when climate, layout, and whole-home scope change the answer.

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Project budget

Mini-Split Installation Cost Calculator

Build a gross and after-incentive planning range from zone count, installation path, electrical scope, and cold-climate equipment.

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Room sizing

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.

Usually 9k to 12k BTU.

Room sizing

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.

Usually 15k to 18k BTU.

Open area sizing

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.

Usually 18k to 24k BTU.

Whole-home screen

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.

Often 30k to 36k total, but design matters.

Garage sizing

What Size Mini Split for a Garage?

Garage mini-split sizing depends heavily on insulation, door exposure, sun, and how you use the space.

Often 12k to 24k BTU.

Room sizing

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.

Usually 9k BTU.

Room sizing

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.

Usually 12k BTU.

Mid-home screen

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.

Usually 24k BTU total.

Whole-home screen

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.

Often 40k to 48k BTU total, but design controls the answer.