BOLDR HOME

Mini-Split for Shed: What Size and Cost to Expect

by Dua Jones May 4, 2026

A mini-split is one of the most effective ways to heat and cool a shed — it provides both functions in one system, requires no ductwork, and runs efficiently even in well-insulated smaller spaces. Most sheds need a 9,000–12,000 BTU single-zone mini-split. The main requirements are a dedicated 230V electrical circuit and a wall or exterior mounting location for the outdoor unit. This guide covers sizing, installation, and what to expect.

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What Size Mini-Split for a Shed?

Shed Size	Recommended BTU	Notes
Under 200 sq ft	6,000–9,000 BTU	Small hobby shed or storage shed with workspace
200–400 sq ft	9,000–12,000 BTU	Most common shed range; covers most uses comfortably
400–600 sq ft	12,000–18,000 BTU	Large workshop-style shed; add more if poorly insulated
600+ sq ft	18,000–24,000 BTU	Large shop or studio; consider insulation upgrades first

Insulation matters significantly in sheds. An uninsulated shed has very high heat gain and loss — a 12,000 BTU unit that works well in an insulated shed may be insufficient in an uninsulated one. If your shed is uninsulated, add insulation before sizing a mini-split — it will let you choose a smaller, less expensive unit and dramatically reduce operating costs.

Electrical Requirements

A mini-split for a shed needs a dedicated 230V circuit run from your home's electrical panel. This is the most significant part of the project for most homeowners — running a subpanel or dedicated circuit to an outbuilding requires trenching if underground, an electrical permit, and a licensed electrician in most jurisdictions.

Underground conduit: $5–$10 per linear foot installed
Subpanel installation: $500–$1,500
Combined electrical cost for shed power: $1,000–$3,000 depending on distance from main panel

What Mini-Split Is Best for a Shed?

For most sheds, a budget-tier single-zone unit (MrCool DIY, Pioneer, Senville) provides adequate comfort at lower equipment cost. Premium brands (Mitsubishi, Daikin, Fujitsu) offer longer warranties and cold-climate models for sheds used year-round in cold regions. The MrCool DIY series is popular for shed installations because homeowners can complete the mechanical installation themselves, reducing labour cost.

Frequently Asked Questions

Can I heat a shed with a mini-split in winter?

Yes — a mini-split heat pump heats as well as it cools. For sheds in cold climates, specify a cold-climate model (rated to −13°F / −25°C) to ensure reliable heating on the coldest days. For sheds that only need frost protection (keeping the space above freezing), even a standard model at lower settings works well.

How much does it cost to put a mini-split in a shed?

Total cost typically ranges from $2,500 to $6,000 including equipment, electrical work, and installation. The electrical run from the house to the shed is often the largest variable — longer distances or underground runs increase cost significantly. A DIY-installed pre-charged system reduces the mechanical installation cost by $500–$1,500.