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Air Conditioner Types2019-02-07T13:35:38-05:00

Air Conditioner Types – Choosing the Right A/C for Your Home and Needs

Which air conditioner type should you choose to keep cool efficiently and affordably? During the summer months, a combination of high temperatures, increased humidity, and bright afternoon sunlight can make it uncomfortably warm inside your home. Installing an air conditioning system will not only create a cooler indoor environment, it can also improve respiratory conditions like asthma and some types of A/C can even eliminate odours and pollutants.

There are two primary categories of air conditioning system:

  • Room air conditioners: intended to cool small areas
  • Central air conditioners: designed to cool an entire home or multiple areas at once

Each type has its own variations aimed at an apartment dweller or homeowner’s particular budget and needs.

To help you decide which system is right for you, we explain the features, key details, things to consider, average prices and operating costs, advantages and benefits, and potential downsides of each air conditioner type.


Window Air Conditioner


Window-mounted air conditioners are used to cool single rooms. They are installed in an open window with the cool air return system on the inside and the hot air exhaust turned outside.

Typical cooling capacities range from 5,000 to 12,500 British Thermal Units (BTU/hr). When deciding which capacity meets your needs, take these guidelines into account:

➤ An average of 20 BTU is needed for each square foot of space to be cooled

➤ Rooms with higher ceilings may need more cooling power

➤ Rooms that get a lot of sunlight need an additional capacity of 10%

➤ If more than two people regularly use the room, add 600 BTU for each extra person

➤ ENERGY STAR recommends an additional 4,000 BTU for units installed in kitchens


Before purchasing a window unit, check for an ENERGY STAR®-rating.

These models use approximately 10% less energy than comparable units and include digital thermostats, multiple cooling speeds, programmable timers, and other features that enable better control over operation and energy use (source).

Advantages of a Window Air Conditioner

  • Compact and comparatively inexpensive
  • Relatively easy to install and uninstall
  • Does not take up floor space, which is a plus in smaller rooms
  • Great for renters since it can be taken with you when you move

Potential Disadvantages

  • More challenging to remove and set up in a different room
  • Not supported by all windows
  • The panels that hold them in place can let in hot air if not installed correctly, making the units less efficient
  • Takes up window space/may make a window otherwise unusable while installed


Portable Air Conditioner


Portable air conditioners are a recommended solution for homes and apartments that are unable to install a window unit due to unusual window configurations or building regulations.

Portable units are more flexible than window air conditioners because they can be moved from room to room. They use air inside the room to cool the condenser and blow hot air outside via a hose that vents through a window.

BTU ranges and considerations are generally similar to window air conditioners (see above). Also like window units, most portable air conditioners have adjustable thermostats and multi-speed fans for maximum climate control and even include a timer for powering the unit on and off according to a preset schedule.

Advantages of a Portable Air Conditioner

  • Less expensive than central air
  • Easy to set up
  • Doesn’t require permanent installation
  • Great for renters since it can be taken with you if you move

Potential Disadvantages

  • More expensive than a window unit
  • Noisier operation, as all of their operating parts are indoors instead of facing outside
  • Some models have a drip tray which needs to be emptied somewhat frequently (depending on use)
  • Takes up floor/room space


*Note these are just general estimates for average Canadians. Many factors can impact usage costs including the size of your home, how much you use it, the temperature at which you set your thermostat, how well-insulated your home is, local electricity prices, if you use it during peak or off-peak times, your unit’s efficiency rating, and so on.


Central air conditioning systems are designed to cool an entire home using refrigeration technology. They consist of a large compressor and coil that are installed outside and connected via refrigerant lines to a coil mounted in your furnace. The duct system is used to distribute hot air in the winter as well as cool air in the summer.

Choosing the right size of air conditioning system for your home requires a close look at different factors that affect your home’s internal temperatures. They include:

  • The home’s age
  • Total volume of all living spaces
  • The number and orientation of your windows
  • How much sunshine can enter the home
  • Type and condition of existing ventilation system and ductwork
  • Is there room above your furnace for the coil? In some homes the furnace may be in a crawlspace or otherwise not have enough room to fit the new central A/C’s coil.

Buying the right size for your home is important. If the system you select is too big, it will over-cool the air and turn off too quickly. The walls, furniture, and other structures will not be sufficiently cooled, however, causing the AC to start up again and create an expensive series of ‘short runs’. Undersized systems are just as problematic, as they will waste energy -and cost money- by running continuously, struggling to adequately cool the home.

Once you source a system that is the right size to cool your home, you will want to check its Seasonal Energy Efficiency Ratio (SEER) rating. The higher the rating, the less energy it will consume. ENERGY STAR® qualified systems range between 12 and 23 SEER.

Note room air conditioners are typically rated using Energy Efficiency Rating (EER), while central A/Cs are typically rated using SEER (source).

Advantages of a Central Air Conditioner

  • Cools the entire home
  • Utilizes air filters to provide cleaner air
  • Supports a programmable thermostat, which can save money on cooling costs
  • Relatively little maintenance required

Potential Disadvantages

  • Can be more expensive to install
  • More costly to operate than a small portable or window unit (since it cools a much larger area… i.e. your entire home), but is still generally a better and more economical option than using multiple window or portable units
  • Depending on where the outdoor unit is located, it can produce a fair amount of noise which may be annoyance when sitting nearby like on your patio, backyard deck, pool, etc.

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Ductless Mini-Split Air Conditioner


Split air conditioning systems are ductless, which is ideal in home extensions, condos, and smaller homes or older homes and buildings with hydronic or electric baseboard heating that have no ductwork. They work by extracting hot air and humidity from the room(s) and expelling both through the compressor into the outdoors. Compressor refrigerants cool air from the exterior and the fan blows the chilled air around the room.

Like single-package air conditioning systems, a favourable SEER rating is important when it comes to saving money.  An ENERGY STAR® qualified split system will have a rating of 13.0 and up (source).

Advantages of a Mini-Split Air Conditioner

  • Versatile installation: can be positioned on the wall or floor
  • No venting required
  • Zoned cooling without having to close off vents

Potential Disadvantages

  • Initial expenditure: can be more expensive to set up than a traditional central air system
  • Can only push air so far, so cooling larger rooms may be difficult
  • Requires visible indoor units which can take up wall space and which some people may consider an eyesore
  • Since one or multiple indoor units are needed, they can produce somewhat more noise than a central unit placed outside


When determining which type of air conditioner you require, you will need to consider the size of the area being cooled and whether you want a temporary or permanent cooling solution.

Final Thoughts

When it comes to air conditioning systems, no A/C type is superior to another. The most practical and cost-effective choice depends on your home’s configuration and layout as well as your personal preference. Consultation with an expert will help you select the appropriate type, model, and size for your budget.

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