Hot or Cold in Your Household? Split the Difference With a Mini-Split Air Conditioner

By Shelley Frost

August 23, 2022

Updated October 23, 2026

Are you feeling the heat in your home? If your HVAC system is coming up short, a mini-split AC system could offer the cooling relief you crave. These ductless cooling systems are versatile and effective at cooling, and many models also heat your home in the winter.

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What Is a Mini-Split Air Conditioner System?

A mini-split AC is a two-part ductless cooling system consisting of an outdoor condenser and indoor air handlers. Each air handler cools a specific room or area, and you can connect multiple handlers to a single condenser. This allows for zone control with the option to set different temperatures in each space.

How Does a Mini-Split Air Conditioner Work?

Mini-split air conditioner systems work similarly to central AC, but the process is slightly different. Tubes and wiring connect the condenser to the air handlers, so it cools the house without any ductwork. Cool refrigerant runs through the coils in the indoor unit, which absorb heat in the room. The refrigerant carries that heat outdoors. Once it reaches the outdoor condenser unit, the heat is released to cool the refrigerant, which is then pumped back to the indoor air handler.

Mini-Split Vs. Central Air Conditioning

Comparing a mini-split vs. central AC vs. window AC can help you decide which cooling option is best for your home. The cooling process between a mini-split AC system and central air conditioning is essentially the same. However, central air systems have one indoor unit where the refrigerant is pumped to produce cool air. It then blows through the ducts to all parts of the home. You typically set one temperature for the entire house, although you can get systems with dual-zone cooling.

With a ductless mini split, you have refrigerant running to each of the indoor air handlers. The cooled air blows directly out of the indoor unit instead of going through vents. You can have a single-zone mini split when you need supplemental cooling for one area or a multi-zone mini split to cool several rooms, each with individual temperature controls.

Window air conditioners house all parts within one unit instead of having separate indoor and outdoor components. While mini-split installation is a permanent option, window air conditioners are often removed in the winter.

When Is a Mini-Split AC a Good Choice for a Home?

A ductless air conditioner could be a good choice in several situations. The first is in homes without existing ductwork. This could be the case in older homes that aren't equipped with adequate ductwork.

It's also a good option as supplemental cooling if the heating and cooling capability of your current system isn't good enough. You might add air handlers in the warmer parts of the home that don't stay cool enough. A mini-split AC is also useful for heating and cooling room additions instead of connecting them to your existing ductwork.

What Are the Benefits of Installing a Mini-Split AC?

Mini-split cooling offers many benefits that make it a good option, either as your main source of cooling or for supplemental cooling. Here are some of those perks:

Energy efficiency: Since the air blows directly into the room, you eliminate energy loss from ductwork that might leak.
Mini-split heating and cooling: Many ductless HVAC units offer both heating and cooling with one set of equipment.
No ductwork needed: Eliminating ductwork makes the installation process faster, easier and more affordable.
Zone cooling: Individual air handlers let you cool only certain rooms or set different temperatures in each area to increase comfort and efficiency.
Quiet operation: Even though the air handler is in the room, a ductless AC system operates relatively quietly for a more peaceful environment.

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What Are the Drawbacks of Mini-Split Air Conditioners?

Looking at the drawbacks of a ductless HVAC system gives you a more realistic view. Knowing the downsides can also help you prepare for them and find workarounds. Here are some potential drawbacks of a mini-split AC:

Visible wall- or ceiling-mounted air handlers: Some people don't like the look of the air handlers, which are larger and more noticeable than regular HVAC registers.
Initial costs: You may pay more for a mini-split AC upfront, depending on how many handlers you install. However, not installing ductwork can save money.
System sizing and BTUs: If you don't get the correct sizing, you could deal with short-cycling (the system turns off and on after short periods) and poor humidity control.
Less filtration: While ductless mini-splits offer some air filtration, it's not as robust as central air.

How Much Does a Ductless Mini-Split Air Conditioner System Cost to Install?

On average, the mini-split AC cost can range from $2,500 to over $15,000 (CAD 3,451 to over CAD 20,709), according to HomeGuide. The installation costs often vary based on single-zone vs. multi-zone systems. Connecting multiple air handlers to a single outdoor unit will increase the installation costs.

All CAD conversions are based on the exchange rate on the date of publication.

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