Best Ductless Mini Split for Garage Shop (2026): 4 Picks

A brake job in a cold shop goes slower when the air bites, and a heater that only warms one corner leaves the rest of the bay cold. The best ductless mini split for garage shop warms and cools the whole space from a wall unit, so winter work and summer work both stay comfortable.

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Picks for the garage

#	Product	Shop Score	Buy
1	Temprium 24000 BTU Mini Split Air Conditioner	9.7/10	Buy on Amazon
2	Senville LETO Mini Split Air Conditioner	9.6/10	Buy on Amazon
3	COSTWAY 12000BTU Mini Split Air Conditioner	9.6/10	Buy on Amazon
4	Rellytech 11500 BTU Mini Split AC/Heating System	9.6/10	Buy on Amazon

1

Temprium 24000 BTU Mini Split Air Conditioner

Temprium·9.7/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

For a large garage shop that needs strong heating and cooling, with 24,000 BTU and coverage up to 1500 sq ft on 230V power, plus WiFi control and 7 modes.

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Pros

• 24,000 BTU cooling and heating, up to 1500 sq ft
• 19 SEER2 with a DC inverter compressor that adapts its speed
• WiFi app plus Alexa and Google Assistant control
• ETL and AHRI certified, with a washable filter and 133°F self-cleaning

Cons

• 230V power, so use a licensed electrician for the circuit
• 1 year manufacturer warranty
• No line set length is stated
• Heating stated down to 5°F

2

Senville LETO Mini Split Air Conditioner

Senville·9.6/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

For a shop that wants app and voice control, with a 12000 BTU heat pump on 110/120V power, with a 16 ft line set in the box.

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Pros

• 12000 BTU heat pump, 1 ton, with Alexa and app control
• DC inverter, UL Listed and AHRI Certified
• Indoor air handler, outdoor condenser, remote and installation kit included, pre-loaded with refrigerant for up to 25 ft
• 5 years on parts and 5 years on the compressor, per the bullets

Cons

• No coverage area is stated
• No SEER2 figure is stated
• Professional installation required
• No filter detail is stated

3

COSTWAY 12000BTU Mini Split Air Conditioner

COSTWAY·9.6/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

For a shop that wants efficient heating and cooling, with a 12000 BTU heat pump at 20 SEER2 on 115V power, with a washable filter.

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Pros

• 12000 BTU, 1 ton heat pump, 20 SEER2
• Cools up to 750 sq ft
• 5 modes, 4 fan speeds, sleep and ECO modes, iFEEL and turbo, and a 0.5-24 hour timer
• 5 years of parts and 8 years of compressor coverage

Cons

• No ETL, UL or CSA listing is stated, AHRI certification only
• Installation only by a Licensed HVAC Installer
• No low-temperature heating figure is stated
• No line set length is stated

4

Rellytech 11500 BTU Mini Split AC/Heating System

Rellytech·9.6/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

For a smaller shop that wants quiet heating and cooling, with 11500 BTU for up to 550 sq ft on 115V hardwired power, with a tool-free filter rinse.

Check price on Amazon

Pros

• 11500 BTU for up to 550 sq ft, 17 SEER2
• 29 dB sound level
• ETL and AHRI certified, R32 refrigerant
• Filter removes without tools and rinses under water, with one-touch self-cleaning

Cons

• 115V hardwired power, not plug-and-play, power cord not included
• 1 year manufacturer warranty
• Ships in two separate packages
• Vacuum-pumping required before startup

Compared on paper

Specs are the manufacturer’s ratings as listed, collected 2 November 2026.

How the points were given

Each unit is scored on performance, build, value, safety and warranty, using only what the listing publishes. The weights are published on the site’s How We Pick page.

Shop Scores range from a low of 9.2 to a high of 9.8, with each tool positioned by its weighted points proportionally, and more points always yields a higher score.

What the listings tell you

Every listing here states BTU and voltage. Rellytech, Senville and Temprium state an ETL or UL listing. COSTWAY states AHRI certification without an ETL or UL listing. Senville and COSTWAY state 5 years on parts. Rellytech and Temprium state a 1 year manufacturer warranty. Temprium and Rellytech list R32 refrigerant. Senville lists Alexa and app control. Temprium lists WiFi app control. Every listing here lists heating and cooling modes.

How to choose the best ductless mini split for garage shop

Size by BTU and coverage

Temprium lists 24,000 BTU for up to 1500 sq ft. COSTWAY lists 12000 BTU for up to 750 sq ft. Rellytech lists 11500 BTU for up to 550 sq ft. Senville lists 12000 BTU with no coverage area stated.

Power and installation

Temprium lists 230V, so use a licensed electrician for the circuit. Rellytech lists 115V household hardwired power, and the power cord is not included. Senville lists 110/120V power. COSTWAY lists 115V power. Rellytech strongly recommends a professional licensed HVAC technician. Senville states professional installation is required. COSTWAY states installation should be done only by a Licensed HVAC Installer. Temprium states no installation requirement.

Filters and upkeep

The Rellytech filter removes without tools and rinses under water. COSTWAY states a washable filter. Temprium states a washable filter. Senville states no filter detail. Rellytech lists a one-touch self-cleaning function. COSTWAY lists self-cleaning at 134.6°F. Temprium lists a 133°F self-cleaning function.

Heat in cold weather

Temprium lists heating down to 5°F. Senville lists a heat pump that functions at 5°F. COSTWAY lists heating for winter with no low-temperature figure stated. Rellytech lists heating with a title figure of -5°F and a bullets figure of -4°F.

Controls and modes

Temprium lists WiFi app control with Alexa and Google Assistant, plus 7 modes and 7 fan speeds. Senville lists Alexa and app control with routines for temperature changes. COSTWAY lists a remote control with 5 modes and 4 fan speeds. Rellytech lists 4D auto swing with iFEEL, plus 7 modes and a 24H timer.

For more shop upgrades, see every garage upgrade.

Garage Fit Check

• Check the voltage: Temprium lists 230V, so use a licensed electrician for the circuit.
• Rellytech requires hardwiring on 115V household power, and the power cord is not included.
• Rellytech includes a 16.42 ft copper line set.
• Senville includes a 16 ft line set and communication wire.
• Temprium covers up to 1500 sq ft, the largest coverage here.

FAQ: garage tools

What is a ductless mini split?

It is a heating and cooling system without ducts, with an indoor unit and an outdoor unit. The listings here all heat and cool.

Are ductless mini splits heat pumps?

Senville, COSTWAY and Temprium name a heat pump. Rellytech lists heating and cooling modes.

How does a ductless mini split work?

An indoor unit mounts on the wall and an outdoor condenser sits outside, with no ducts. The inverter models here adjust power continuously instead of cycling on and off.

Do ductless mini splits have filters?

The Rellytech filter removes without tools and rinses under water. COSTWAY and Temprium state a washable filter. Senville states no filter detail.

Are ductless mini splits hard to install?

The listings point to professional installation. Rellytech strongly recommends a professional licensed HVAC technician. Senville states professional installation is required. COSTWAY states installation should be done only by a Licensed HVAC Installer. Temprium states no installation requirement.

What size mini split does a garage shop need?

Match the coverage to the shop. Temprium covers up to 1500 sq ft. COSTWAY covers up to 750 sq ft. Rellytech covers up to 550 sq ft. Senville states no coverage area.

Related: the best garage heater for boat storage, the best air compressor for home garage and every garage upgrade.