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HVAC Education, Ductless Systems

Mini Split Pros and Cons

By Ryan Mayes

Having a reliable system to heat and cool your home is a must. And while ducted heating and cooling systems are the most common in the Canada, ductless mini splits are becoming more and more popular. In many ways, ductless mini split systems are like “traditional” forced air systems that use ductwork. Both types of systems include an outdoor unit and at least one indoor unit. Both are designed to move heat energy into or out of your living space to provide heating or cooling. And both systems rely on a chemical refrigerant as a key to their performance. However, there are pros and cons of mini split systems. Understanding mini split pros and cons will help the decision-making process for anybody shopping for a new comfort system.

A Carrier expert discussing mini split pros and cons with a homeowner in a baby nursery.

Advantages and Disadvantages of Mini Split Systems

Exploring the advantages and disadvantages of mini split systems can be a mixed bag. If you understand how ductless systems work, the advantages may seem obvious. However, there might be different perceptions about what is a “pro” and what is a “con.” For example, most people would agree that the higher energy efficiency of mini splits is an advantage. On the other hand, ductless mini split systems require an indoor unit in every space that needs heating or cooling. This can be considered an advantage for flexibility of use and zoning capabilities, or a negative if you don’t love the look of an indoor unit in every room.

A women doing yoga in a room with a high wall mini split installed on the wall.

What is the Major Advantage of Mini-Split Air-Conditioning Systems?

Actually, there are several advantages to consider:

  • Ease of installation: Installing a mini split system is typically easier because there is no ductwork to install. Just a small, approximately 3-inch hole is needed to connect piping between the outdoor and indoor unit (or units). By comparison, installing ductwork for a ducted system requires more time and materials, and in some cases, requires cutting into (and then repairing) walls, ceilings or floors.
  • Energy efficiency: Mini split systems can deliver comfort at higher efficiencies – up to 28.5 SEER2 cooling and up to 18 HSPF2 heating. Because warm or cool air from a mini split air handler enters the room directly, these systems don’t experience the lost energy consumption that is common with ducted systems.
  • Long-term savings: Higher efficiency operation means potential savings on your energy bills for the life of the system.
  • Zoning/Control: Because each room that needs heating and cooling has its own air handler, a ductless mini split system is, by definition, a zoned system. You can heat and cool each space individually – so areas that are populated can be more comfortable while other areas can be set back for energy savings (or turned off completely!).
  • Low noise: By eliminating ductwork, mini split systems also eliminate a source of noise. Air flowing through ductwork can create a “whoosh” sound, and vibrating ductwork can be noisy as well. In addition, many of today’s ductless air handlers have variable speed fans that operate quietly on low speeds.
  • Suitable for room additions/conversions: Converting a garage, basement or attic into an extra living space? Ductless systems make adding comfort easy without the need for ductwork or upsizing your current system to account for the additional load.
Children playing with a ball in the backyard near a mini split outdoor unit.

Disadvantages of Mini Split Systems

When compared to traditional HVAC systems, there are some potential disadvantages of mini split systems to consider:

  • Upfront cost: The initial installation cost of mini split air conditioners or heat pumps can be higher than traditional systems, especially if multiple indoor and outdoor units are required.
  • Not always suitable for larger areas: With ductless heating and air conditioning systems, larger rooms may require more than one indoor unit to provide adequate comfort throughout the space. Ducted systems can more unobtrusively provide comfort in larger spaces because floor or ceiling vents are much less noticeable.
  • Less effective ventilation: Ducted systems can bring in fresh air from outside and provide whole-home air circulation. Mini split systems heat or cool the indoor air in each individual room without bringing fresh air into the mix.
  • Appearance/space: Ductless mini split systems require an indoor unit in every room they are heating and cooling. A typical indoor unit is wall mounted and easily visible in the room, which can disrupt the aesthetics of the space.
  • Space requirements: Both systems require an indoor unit and an outdoor unit, but ductless mini splits can require multiple indoor units and more than one outdoor unit.
  • Maintenance: Like any HVAC system, ductless mini-split systems operate most efficiently and reliably with routine maintenance. Mini split filters should be cleaned every month – and if you have more than one indoor unit, that goes for each one. Ducted systems typically have replaceable filters that can last up to three months before needing to be replaced, and typically have just one indoor unit to deal with.

Mini Split Pros and Cons Snapshot

Here is a summary of the pros and cons of ductless mini split air conditioners and heat pumps:

Advantages Disadvantages
Easy to install Higher upfront costs
Higher energy efficiency Not as effective in larger areas
Long-term savings Lack of ventilation
Zoned system for comfort control Zoned system for comfort control Less attractive appearance
Quiet Potential for more space requirements
Great for room additions/conversions Potential for more maintenance

While the mini split vs central air conversation has a lot of give and take, the best HVAC system for your home is the one that effectively and efficiently heats and cools your living areas to your satisfaction.

Mini Split FAQ

Do Mini Splits Use a Lot of Electricity?

Mini split systems offer higher efficiency ratings – up to 28.5 SEER2 cooling and up to 18 HSPF2 heating. They also eliminate the energy loss from leaking air ducts that occurs with traditional ducted systems.

Which Is Better: Ducted Heat Pump or Mini Split?

Both systems have their advantages and disadvantages. For homes with several rooms and available ductwork, ducted systems make the most sense. For older homes with no ductwork, or for room additions and space conversions, mini splits have the advantage.

Are Mini Splits Loud?

Many of today’s mini split systems are equipped with variable-speed motors which can operate at extremely low – and very quiet – speeds. Carrier mini split system indoor units can operate as quietly as 24 decibels, which is quieter than a whisper and on par with rustling leaves.

Do Mini Splits Work in Extreme Cold?

Yes – mini split systems work during extremely cold temperatures, but the further below freezing it gets, the harder they will have to work. Supplemental heating for those bitterly cold days can help take some of the heating load during those times.

Do Mini Splits Devalue a House?

Not really – some people might consider a mini split system as an added value to the home due to their energy efficiency and the potential for years of savings on energy bills. Additionally, if the mini split system was added because you converted an attic or basement into a new living space, that additional conditioned space may increase to total square footage of living space in your home. They are not likely going to decrease the value of your home.

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