What size mini split for 24x24 garage?

What size mini split for 24×24 garage?


When it comes to heating and cooling a 24×24 garage, a mini split system can be an excellent choice. Mini splits are compact, energy-efficient, and provide both heating and cooling capabilities. However, determining the right size mini split for your garage is crucial to ensure optimal comfort and efficiency. In this article, we will explore the factors to consider when selecting the appropriate size mini split for a 24×24 garage.

Calculating BTU Requirements

Calculating the square footage: The first step in determining the size of the mini split system needed for your garage is to calculate the square footage. In this case, a 24×24 garage has a total area of 576 square feet (24 x 24 = 576).

Insulation and climate considerations: The level of insulation in your garage and the climate in your area will impact the BTU (British Thermal Unit) requirements. If your garage is well-insulated and located in a mild climate, you may need fewer BTUs compared to a poorly insulated garage in a colder region.

BTU per square foot: As a general rule of thumb, you will need approximately 20-30 BTUs per square foot to effectively heat or cool a garage. Multiplying the square footage of your garage by the recommended BTU range will give you an estimate of the BTU requirements.

For example, for a 576 square foot garage, the BTU range would be between 11,520 BTUs (576 x 20) and 17,280 BTUs (576 x 30).

Other Factors to Consider

Usage of the garage: The intended use of the garage is an important factor to consider when selecting the size of the mini split system. If you plan to use the garage as a workshop or for other activities that generate heat, you may need a larger capacity mini split to compensate for the additional heat load.

Number of occupants: If the garage will be frequently occupied by multiple people, their body heat will contribute to the overall heat load. Consider this factor when determining the size of the mini split system.

Windows and doors: The number and quality of windows and doors in the garage can impact the insulation and heat transfer. If your garage has large windows or poorly insulated doors, you may need a higher capacity mini split to offset the heat loss or gain through these openings.


Selecting the right size mini split system for a 24×24 garage involves calculating the square footage, considering insulation and climate, and factoring in additional heat loads from usage, occupants, and windows/doors. By taking these factors into account, you can ensure that your mini split system provides optimal heating and cooling performance for your garage.


– energy.gov
– hvac.com
– thespruce.com