What size mini-split for a 10×12 shed?
120 sq ft at shed insulation factors is often 3,800–4,500 BTU calculated. Retail minimums are 9,000 BTU — that is acceptable for a small shed; the unit will modulate down on inverter models.
Mini-Split for She-Sheds & Backyard Studios
Backyard she-sheds, art studios, and workshop sheds are often lightly insulated kit buildings. Enter footprint — typical 10×12 to 12×20 — and set sun exposure if the long wall faces west.
Space dimensions
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Sizing settings
Small sheds and minimum unit sizes
A 10×12 shed (120 sq ft) may calculate to 3,800–4,500 BTU — retail minimums are 9,000 BTU. Inverter mini-splits modulate down and are acceptable; avoid grossly oversized non-inverter units.
Insulate before you size: spray foam or rigid board in walls and roof cuts required BTU dramatically. See she-shed heating and cooling.
Electrical and permits
Most 9k–12k BTU units need a dedicated 15–20A circuit; larger heads need 220V. Check local code — backyard structures often require permits for HVAC electrical work.
Frequently asked questions
Do I need insulation before installing a mini-split?
Yes — spray foam or rigid board in walls and roof dramatically cuts required BTU and prevents condensation. Insulate first, then size the unit.
Electrical for shed mini-split?
Most 9k–12k BTU units need a dedicated 15–20A circuit. Larger heads need 220V. Check the unit label and local code — permits are often required.
Related calculators
HVAC Calculators · https://hvaccalculators.net/mini-split-for-shed/