Aircon Guide: A Comprehensive Buying and Installation Guide

Buying an air conditioner can be overwhelming, especially with the numerous types and features available. You should consider the size of the space you want to cool, as a unit that's too small won't be effective.

A general rule of thumb is to choose an air conditioner that's 1-2 tons for a small to medium-sized room, and 2-3 tons for a larger room. This will ensure you get the right amount of cooling power.

The type of air conditioner you choose also depends on your budget and personal preferences. Central air conditioners are more expensive but provide better air quality, while window units are more affordable but take up more space.

In terms of energy efficiency, look for air conditioners with a high SEER rating, which indicates how well the unit can cool a space with minimal energy consumption.

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Choosing the right aircon is crucial for effective cooling and energy efficiency. Almost all new models meet the latest Energy Star requirements, but look for units labeled Energy Star Most Efficient for maximum savings.

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To determine the right size, start by measuring the area you need to cool. The square footage will determine the cooling capacity needed, which is indicated by British thermal units (BTUs/hour). A good rule of thumb is to average 20 BTUs for each square foot of living space.

Here's a quick guide to help you estimate the BTU capacity:

Consider factors like windows and ceiling height to fine-tune your estimate. For example, if the room receives little to no sunlight, reduce BTU capacity by 10 percent.

Choosing the right air conditioner for your space can be overwhelming with so many options available. You'll want to start by determining the size of the area you need to cool.

Small spaces, like a bedroom or office, can be cooled with units that cost less than $200, but these units are only suitable for very small areas.

To calculate the square footage of your room, multiply the length by the width. This will help you determine the right capacity for your air conditioner.

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A general rule of thumb is to look for units with a capacity of 5,000 to 12,500 Btu, which is the range of units we test.

Here's a rough guide to help you estimate the right capacity for your space:

Keep in mind that Energy Star recommends fine-tuning your Btu estimate based on factors like shading, sunlight, and occupancy.

Choosing the right air conditioner can be overwhelming, but let's break it down to the essential features to consider.

Energy efficiency is a top priority, and most new models meet the latest Energy Star requirements. However, look for units labeled Energy Star Most Efficient for maximum savings.

Many models include better insulation and tighter-sealing installation kits, which help keep cool air inside. U-Shaped and Inverted U-Shaped Units are also worth considering, as they consistently rank among the quietest window units in tests.

U-shaped models allow the window sash to slide into a slot in the unit, effectively insulating you from not only the outside heat, but also the noise coming from the compressor. Inverted U-shaped models drape over the sill and block less light—ideal for rooms where daylight matters.

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These air conditioners are pricier and can be trickier to install, but many now include adapter kits for homes with older or nonstandard windows.

Inverter-Powered Units are a great option, as they adjust their speed to maintain a steady temperature, resulting in lower energy use, quieter operation, and quicker, more consistent cooling.

Smart & Connected Features can also enhance your aircon experience, including geofencing, voice control, scheduling & energy tracking, and more.

Noise levels are a crucial consideration, especially for light sleepers. Inverter and U-shaped units tend to be the quietest, with some models barely louder than a fan on low.

If your window isn't centered on a wall, choose a model with adjustable louvers or swiveling fan arms to push cool air toward the center of the room.

Finally, consider the length of warranty offered by the manufacturer, with some inverter models now offering five-year compressor warranties for long-term reliability.

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There are several types of aircon systems to choose from, each with its own unique features and benefits.

Ducted air conditioners use a complex system of ducts to move air throughout the home, while ductless air conditioners have several points of contact that push air through your home.

Split system air conditioners are a popular choice, consisting of an outdoor compressor unit and an indoor unit that work together to cool a space. They're usually used to cool one or an open plan area of up to 60m2.

Multi-split systems are similar to split systems, but with one outdoor unit connected to two or more indoor units, making them ideal for cooling multiple rooms.

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Portable air conditioners are a great option for homes with unique window configurations or building regulations that prevent traditional window unit installation.

They can be moved from room to room, making it easy to cool specific areas when needed.

Most portable units have a venting kit for the exhaust, so keep this in mind when thinking about placement.

If the unit has a hose to utilize outside air, you’ll need to make sure it can be placed near a window.

Portable models are intended for homes in which window configurations or building regulations prevent installation of conventional window units.

The portable air conditioners in our tests range from 9,000 to 15,500 Btu.

However, don’t compare portable and window air conditioners by that measurement alone.

Portables aren’t nearly as good at cooling as manufacturers claim, and they’re pricey and use more energy than similarly sized window units.

Because all the mechanicals are sitting in the room, they tend to be noisier than window-mounted units.

Their 50- to 80-pound weight can make them cumbersome and ungainly to roll across carpets or thresholds.

Cost-wise, portable air conditioners can range from $350 to $800.

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Central air conditioners are whole-home solutions that can deliver air to every room with a vent. They're a great option for larger homes or homes with multiple levels.

The indoor unit's fan pulls warm air from the home and pushes it through several filters to ensure most airborne contaminants are removed. This air is then cooled by the liquid refrigerant as it moves over a cold evaporator coil.

Central air conditioners are typically more expensive than other types of air conditioning systems, but they can be more cost-effective in the long run. They're also a good option if you want to control the temperature of your entire home with a single system.

Here's a comparison of central air conditioners with other types of systems:

Central air conditioners are a good option if you want a whole-home solution that can deliver air to every room with a vent. They're a bit more expensive than other types of systems, but they can be more cost-effective in the long run.

Commercial spaces have unique cooling needs, especially when it comes to larger rooms and commercial use. As you consider the type of aircon system for your business, remember that room size is just one factor to think about.

For larger spaces, you'll want to consider the capacity of the aircon system. Air conditioners for larger spaces and commercial use can be more powerful, with some models capable of cooling areas up to 1,500 square feet.

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Many air conditioners now come with Energy Star labels, which indicate they meet the latest energy efficiency requirements. Look for units labeled Energy Star Most Efficient for maximum savings.

Inverter-powered units are a great option, as they adjust their speed to maintain a steady temperature, reducing energy use and noise levels. They're also quieter and provide quicker, more consistent cooling.

Some air conditioners have smart features like geofencing, which automatically turns the unit on as you approach home, and voice control, which works with popular assistants like Alexa and Google. You can also schedule and track energy usage with these units.

Noise levels can be a concern, especially for light sleepers. Inverter and U-shaped units tend to be the quietest, with some models barely louder than a fan on low.

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The Fresh Intake/Exhaust Setting is a feature that provides ventilation without cooling. This means that you can get a refreshing breeze without the system blowing cold air.

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You can adjust the setting to your preference, depending on the situation. This feature is especially useful when you need to circulate air without cooling down the space.

In certain situations, such as when you're working with chemicals or engaging in strenuous activities, you might prefer the Fresh-Air Intake or Exhaust Setting. This setting can help remove stale air and bring in fresh oxygen.

It's worth noting that this feature doesn't provide cooling, so you might still feel a bit warm in hot environments. However, it can make a big difference in terms of air quality and overall comfort.

Fan mode is a great way to save energy and money, as the compressor is off, which means it's not using up energy. However, it does mean that cool air isn't being pumped around the room.

This mode is similar to using a portable fan or a regular/ceiling fan, which circulate air in the room but don't change the temperature.

If you're looking to take control of your indoor air temperature, consider buying a system that's compatible with programmable thermostats. These devices give you the ability to manage your home's cooling from an app on your smartphone.

Programmable thermostats can be a game-changer for saving money by turning your system off when it's not being used. In fact, some air conditioners are now designed to work seamlessly with these devices.

According to our research, many 2025 models go beyond simple app control, offering features like geofencing, voice control, and scheduling & energy tracking. These features can help you monitor usage and save on bills.

Some air conditioners even come with five-year compressor warranties, which can provide long-term reliability.

AC units use a built-in temperature sensor to determine whether to produce warm or cool air.

Most air conditioning units have a default cool mode that switches on the compressor to generate cool air.

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You can set a temperature for the room to drop to, and once reached, the compressor will switch off, leaving the fan running.

This setting can drain a lot of power, especially if you set it too low, but the recommended temperature for energy-saving is around 24°.

The compressor will work to cool the air down if it's warmer than the set temperature, and warm it up if it's cooler.

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To keep your air conditioner running efficiently, it's essential to identify an energy-efficient model. Look for the ENERGY STAR label, which indicates systems that use ten per cent less energy than standard models.

The ENERGUIDE label is another way to determine a model's energy efficiency ratio (EER), with higher numbers signifying more efficient units.

Regular maintenance is also crucial to maintaining performance. Consider setting up a service plan when scheduling installation to ensure your HVAC system is running smoothly.

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Modern air conditioners have improved significantly in efficiency and capacity over the past two decades.

A higher SEER rating means the unit is more efficient. Look for SEER ratings between 15 and 23 for an efficient unit.

Capacity is usually measured with British thermal units (BTUs). A higher BTU rating indicates the system has a higher capacity.

Professional HVAC technicians can tell you what capacity is necessary for your home.

You can choose the right unit that will not just keep you cool, but also help you save on energy costs too.

Regular maintenance is essential to keep your air conditioner performing at its best. Different types of air conditioners have different maintenance requirements.

Your HVAC system plays a big role in maintaining a comfortable and healthy indoor environment. To keep it running smoothly, consider setting up a service plan when scheduling installation.

Routine maintenance can help prevent costly repairs and extend the lifespan of your air conditioner.

Before buying an air conditioner, research what's available on the market. There are different types and features to consider, so it's essential to familiarize yourself with them.

You can find a wide range of room air conditioners, each with its unique features. Some come with more advanced technology, while others are more budget-friendly.

Consider buying a system that's compatible with programmable thermostats to gain more control over your indoor air temperature. This will allow you to manage your home's cooling from an app on your smartphone, helping you save money by turning your system off when it's not being used.

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Bigger is not always better, especially when it comes to room ACs. An AC that's too large for a space can be less effective, decrease home comfort, and waste energy.

To determine the right size, start by measuring the area you need to cool. The square footage will determine the cooling capacity needed.

Average 20 BTUs for each square foot of living space. This is a general rule of thumb to consider.

If the room receives little to no sunlight, reduce BTU capacity by 10 percent. This will help your AC work more efficiently.

If the room receives a lot of sunlight, increase BTU capacity by 10 percent. This will help your AC keep up with the increased heat.

If the room is typically occupied by more than two people, increase BTU capacity by 600 BTUs per person. This will ensure everyone stays cool and comfortable.

If the AC unit is being placed in a kitchen, increase BTU capacity by 4,000. Kitchens can get very hot, so you'll need a more powerful AC to keep the space cool.

If you're still not sure, consult a certified air conditioning contractor. They can help you choose the right sized unit for your space.

Before making a purchase, it's essential to research what's available in the market. There are a variety of room air conditioners available on the market.

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You can start by familiarizing yourself with the different types of room air conditioners, such as window units, portable air conditioners, and through-the-wall units. These types of air conditioners have different features and benefits.

Room air conditioners come with various features, including different cooling capacities, energy efficiency ratings, and noise levels. For example, some air conditioners have a higher cooling capacity, while others are more energy-efficient.

When choosing a room air conditioner, consider your specific needs and preferences. Think about the size of the room you want to cool, your budget, and any specific features you require.

If you're in the market for a new air conditioner, you'll want to look for models with advanced features and systems that can make a big difference in your cooling experience.

Some air conditioners now come with inverter technology, which allows the compressor to adjust its speed to maintain a steady temperature, resulting in lower energy use, quieter operation, and quicker, more consistent cooling.

Inverter-powered units are now common across midrange air conditioners, and they're worth considering for their energy-saving benefits and improved performance.

If you're a light sleeper, you'll appreciate the quietest models, which are barely louder than a fan on low. Inverter and U-shaped units tend to be the quietest, making them ideal for bedrooms.

To find the right air conditioner for your needs, consider the following features:

These features can make a big difference in your daily life, allowing you to stay cool and comfortable while also saving energy and money.

If you're looking for an air conditioner that's more than just a cooling machine, you're in luck. Many modern air conditioners come with smart features that can make your life easier and your home more comfortable.

Some highly rated air conditioners have digital displays that show you the temperature, timer, and other important information. You can even use a remote control to adjust the settings from across the room.

Inverter-powered units, for example, adjust their speed to maintain a steady temperature, which means they're not only more efficient but also quieter. They're perfect for bedrooms or living rooms where you want to relax in peace.

If you have a smartphone, you can use it to control your air conditioner with features like geofencing, which automatically turns the unit on as you approach home. You can also use voice control with Alexa, Google Assistant, or Apple Home to turn on the AC or check the temperature.

Some air conditioners even have built-in Wi-Fi and can be controlled remotely through an app. You can check your energy usage, troubleshoot issues, and even receive notifications when the air conditioner needs maintenance.

Here are some of the smart features you can expect to find in modern air conditioners:

VRF systems are widely used in commercial buildings, spacious homes, or high-rise apartments because they can connect to multiple indoor units and offer more efficiency in operation.

This type of air conditioner can be the more efficient to operate, because it circulates less amount of refrigerant than multi-split system units needed during a heating or cooling period.

VRF units are much bigger than multi-split system units, which makes them suitable for larger spaces.

You can individually control different air conditioning zones at one time with a VRF system, making it a great option for homes with multiple rooms or areas that require separate temperature control.

Some air conditioners come with digital displays that show you the temperature and other important settings at a glance. This can be super helpful when you're trying to figure out why your AC isn't cooling as well as it should.

Highly rated air conditioners often have built-in timers that let you set a schedule for when you want the AC to turn on and off. This can be a lifesaver if you tend to oversleep or forget to turn off your AC when you leave the house.

Many units have remote controls that let you adjust the temperature and other settings from across the room. This can be really convenient if you have a big house or prefer to lounge on the couch while you watch TV.

Some air conditioners have touchpad controls that make it easy to adjust the settings without having to get up or use a separate remote. A few models even change the direction of the airflow automatically to disperse cool air throughout the room better.

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