Guide to Choosing an Energy-Efficient Air Conditioner

Three Illustrations of Energy-Efficient Air-Conditioners

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How to Choose an Energy-Efficient Air Conditioner

There is possibly no modern invention more essential to comfortable living than air-conditioning. Air conditioners today鈥攆rom window units to central systems鈥攁re more energy efficient and cost effective than ever before, so your energy bill doesn鈥檛 have to go up while you cool down.

It鈥檚 a wonderful feeling: walking out of the sweltering heat and humidity of an August day into a room that has been cooled to the ideal home temperature. And air-conditioning is still a relatively modern invention!

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Select the information you need in order to find the best air conditioner and to maximize its energy efficiency:

What to Look for When Buying a New, Energy-Efficient Air Conditioner

There are a few key things to look for when you鈥檙e buying a new energy-efficient air conditioner that will help keep your energy bill鈥攁nd the temperature in your home鈥攍ow.

Features to Look for When Choosing an Air Conditioner:

Right size A/C for your space: Size matters when you鈥檙e choosing an air conditioner. A too-large unit will cool the air but leave it damp and clammy. A too-small unit will have to work overtime to maintain the set temperature, driving up your energy bill. Air conditioner sizing is probably the single most important factor to consider.
Programmable temperature settings: These days, even basic window units come with digital displays so that you can set a precise temperature and even schedule your A/C to turn off when you鈥檒l be out and back on when you鈥檙e coming home. Central air systems are frequently even more flexible.
Energy-saving setting: Another feature to look out for in the best air-conditioners is an energy-saving setting, which means that the unit will turn off not only the compressor but also the fan once your space has cooled off, thus conserving energy.
High EER and SEER ratings: These two related (but not interchangeable) ratings are a measure of a particular unit鈥檚 energy efficiency measured in BTUs. Meanwhile, EER stands for 鈥渆nergy efficiency rating,鈥� and SEER stands for 鈥渟easonal energy efficiency rating.鈥� Overall, a higher rating means greater efficiency, and SEER and EER ratings can be found for both room and central air-conditioners.
ENERGY STAR庐 certification: Look for the blue ENERGY STAR庐 certification when you鈥檙e deciding on the best air conditioner for your home. This certification means that this particular unit has met or exceeded higher efficiency standards than other similar models.
Wifi-enabled A/C: If you鈥檝e begun to experiment with making your home smart鈥攊f you have a device like , for example, or a Wifi-enabled thermostat that you can adjust with your smartphone鈥攃onsider installing a smart air conditioner. You can find smart versions of all types of A/C units鈥攚indow, split unit, portable, ductless mini and so on. Because these units are so adjustable, the energy-saving possibilities are amazing and allow you to really fine-tune your usage.

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How to choose an air conditioner size

Properly sizing an air conditioner is important to ensure your home is cooled without using excess energy. Air conditioners work by (1) reducing the humidity and (2) reducing the temperature. A larger A/C will not cool your space faster and better鈥攂ut it will cool the air faster than it can remove the humidity, so what happens is that the air turns damp and clammy.

It鈥檚 easy to choose the right size, however, because useful websites like ENERGY STAR庐 provide an air conditioner BTU chart that tells you what size model you need for your size space. Simply measure your space to figure out the square feet you鈥檙e trying to cool, and then consult an air conditioner BTU chart () to figure out how many BTUs you need for that size of space.

When selecting the size of a central air conditioner for your home it is important to check the 鈥渢onnage鈥� for each model. , one 鈥渢on鈥� is equivalent to 12,000 BTU per hour, and sizes generally range from 1- to 5-ton units. The tonnage required for your A/C may increase depending upon factors such as your local climate and the square footage of your home.

If you are looking to purchase a new central air conditioner, ENERGY STAR庐 offers to help you select the correct size for your home.

How to read an air conditioner鈥檚 EnergyGuide label

One great way to learn a little more about a specific air conditioner is to examine the bright yellow . These labels are required by for both room and central air conditioners, and they pack a lot of information into a small space. EnergyGuide labels are a useful way to quickly compare similar models without having to spend all your time researching different air conditioners.

This lists the type of air conditioner and any key features.
This is the make, model and size of the appliance.
This is the average projected yearly .
This is the range of costs of similar air conditioners so you can judge where the yearly cost falls in comparison to other models.
The EER is the energy efficiency ratio, a number produced by dividing the air conditioner BTU rating (its output) by its wattage (its input). The higher the number, the better.
The ENERGY STAR庐 designation signifies that the air conditioner has passed the stringent energy efficiency guidelines set by energystar.gov.

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Choosing Between Different Types of Air Conditioners

Different types of air conditioners are better suited for different living spaces. For instance, if you live in an area that experiences intense heat for a majority of the year then you鈥檒l probably want a split or packaged air conditioner. But if you鈥檙e unable to install central air in your home for whatever reason, you may have to look at a window unit or a portable air conditioner.

You鈥檒l also need to keep in mind the air conditioner sizing before deciding what unit to buy - having the wrong sized A/C unit for your room could increase your energy bill. To help you make a more strategic decision here are some of your options:

Types of central air conditioners

For central air conditioners, you can generally choose between either a split or packaged A/C system. These units (if you have them), and are preferred for homes where it is hot for a majority of the year.

Split air conditioners

Split air-conditioning units usually come in two pieces鈥攁n exterior compressor and an interior fan system of some kind. The louder component goes outside, where the noise and heat will be less of a nuisance, and the cool air is pushed around the inside of the house through ducts.

Packaged A/C systems

Packaged air-conditioning systems are central air, often installed as part of a dual heating and air-conditioning system (HVAC). If your residence already has forced air heating (and therefore ductwork), packaged or central air conditioning will be the most efficient and (relatively) least expensive option.

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Other types of air conditioners

Window unit A/Cs

Window units are self-contained air conditioners that come in a wide range of sizes. They can be put in place only during the months that they are needed, or sometimes they are permanently installed by being inserted through the wall of the house.

Portable air conditioners

Portable air-conditioning units look a lot like dehumidifiers. They are wheeled cabinets that (like window units) include all the necessary components of a cooling system. They need to be vented to the outside and usually come with a kit for this purpose. Some portable units are self-evaporative, but many will require you to empty a water tank at regular intervals.

Inverter air conditioners

Unlike the compressors in traditional air conditioners, which regulate temperature by turning on and off, inverter air conditioners work at variable speeds, drawing only the amount of energy they need to maintain the set temperature. They therefore use less energy than traditional air conditioning units and cool more efficiently, but since the technology is relatively new, the initial investment鈥攖hat is, the cost of the units鈥攊s higher.

Ductless mini-split A/C units

Ductless mini-split units also come in two pieces鈥攁 wall-mounted interior unit and an exterior compressor. They are quiet and energy efficient, and they can be installed in houses where retrofitting ductwork would be prohibitively expensive or complicated.

Wifi-enabled/smart air conditioners

A Wifi-enabled air conditioner uses your smartphone as a sophisticated remote control, and some integrate easily with smart home devices like Amazon鈥檚 Alexa or 海角大神鈥檚 smart home hub, .听This gives you very precise control over the appliance cooling your house, and it also allows the system to provide you with feedback about energy usage and efficiency.

Solar air conditioning systems

Solar air conditioning systems are exactly what they sound like鈥攁ir conditioning units that are powered partially or totally by solar energy.

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Comparing Air Conditioners: Split vs. Window vs. Portable A/C units

Maybe you鈥檙e wondering what the relative merits are of split A/C vs. window A/C or window A/C vs. portable A/C.
Here are some comparisons that might help.

Split AC vs. Window AC vs. portable AC Comparison Table

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It鈥檚 also worth looking at some of the pros and cons of each air conditioning option.

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Split air conditioners

Advantages of split air conditioners:

They have greater energy efficiency than either window or portable A/Cs.
They don鈥檛 block up a window all summer long.
They tend to be quieter and less physically intrusive.

Disadvantages of split air conditioners:

The outside unit can be large, noisy and intrusive.
They tend to be expensive, and installation can be time consuming and drive the cost up further. (This is less true of ductless mini-split units, of course.)
They might be tricky to install in older homes without pre-existing ductwork, and it might not make sense to retrofit air conditioning.

Window A/C Units

Advantages of window A/C units:

These units are easy to find and install.
They鈥檙e relatively affordable鈥攁 good unit might only cost a couple of hundred dollars.
They鈥檙e relatively quiet and energy efficient.
They drain to the outside.

Disadvantages of window A/C units:

While you can technically move them, that would be a hassle.
Not all windows support these air conditioning units well.
They are difficult to insulate, allowing more hot air into your home than a split system.
They鈥檙e not pretty.

Portables A/Cs

Advantages of portable A/Cs:

They don鈥檛 take up a window.
They can be moved from space to space as necessary.

Disadvantages of portable A/Cs:

鈥淧ortable鈥� is relative because the unit still needs to vent to the outside.
They can be more expensive than comparable window units.
They鈥檙e less efficient and noisier than window units.
Many models will require you to periodically drain a condensation tank (like dehumidifiers).

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What is an evaporative cooler?

If you live in the Western United States you may be familiar with the evaporative 鈥渟wamp鈥� cooler. The evaporative cooler is an alternative to standard air conditioners that draws hot, dry air through damp pads, adding moisture to the air. Usually, evaporative coolers are less costly to build and install since they鈥檙e basically a powerful fan with a pad that collects and redistributes cool, damp air back into your home. They are also less costly to run, using as little as a quarter of the electricity used by an air conditioner. Evaporative coolers also don鈥檛 use any environmentally unfriendly chemicals such as those found in older A/C units.

Evaporative coolers aren鈥檛 recommended if you live in the Eastern United States--just regions like Nevada or New Mexico that have a hot, dry climate. If you live anywhere with high humidity, evaporative coolers could fill your rooms with hotter, more humid air, so while the cost and potential energy savings may sound enticing, it鈥檚 strongly advised that this device is only used in appropriate regions and you will be far better off using a regular energy-efficient air conditioner.

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9 Ways to maximize your energy-efficient air conditioner

Once you鈥檝e bought and installed your energy-efficient air conditioning system or A/C unit, you鈥檙e good to go, right? You just turn your A/C on in the summer, off in the winter, and you鈥檙e done, right? Time to enjoy that lemonade by the pool!

Not quite - The way you use your air-conditioner is as important as what air conditioner you buy. So here are 10 tips for how to maximize your energy-efficient air conditioner.

In the summer, program your settings to match the ideal thermostat temperature of 78 degrees to better manage cooling costs.
At night, when the air is cooler, try turning the A/C off and opening the windows.
Turn off all unnecessary lights and appliances. They all generate heat that the air conditioner has to then remove.
Program your thermostat to increase the temperature by a few degrees when no one is home. Doing so will decrease the workload on your A/C.
Install and use ceiling fans. They circulate the air more efficiently than an air conditioner can by itself, and they use far less energy. Just make sure that you鈥檝e set 鈥攃ounterclockwise, which sends the air down.
Fully and properly insulate and seal any point where an A/C unit (or any part of a larger A/C system) enters your house. A poorly seated window unit, for example, can let in more hot air than your unit can cope with.
If you have window units, make sure they鈥檙e clean. Monthly鈥攚iping down the vents and rinsing the filter鈥攚ill keep your units running smoothly and efficiently.
If you have central air conditioning, make sure your air ducts are clean. There are many , including catching mold before it gets a hold on your system; keeping dust out of the air and off your clothes, furniture and surfaces; and improving the efficiency of your air-conditioning system.
Keep your home cool with these to help prolong the life of your unit.

Air conditioners are more sophisticated and energy efficient than ever. They come in a range of styles and sizes to suit any living situation, making it simple to find the best air conditioner for your home. They鈥檙e also鈥攓uite literally鈥攁 breath of fresh air on a hot, muggy day, so rest assured you can now choose the best one!

海角大神

How to Choose an Energy-Efficient Air Conditioner

Select the information you need in order to find the best air conditioner and to maximize its energy efficiency:

What to Look for When Buying a New, Energy-Efficient Air Conditioner

Features to Look for When Choosing an Air Conditioner:

How to choose an air conditioner size

How to read an air conditioner鈥檚 EnergyGuide label

Choosing Between Different Types of Air Conditioners

Types of central air conditioners

Split air conditioners

Packaged A/C systems

Other types of air conditioners

Window unit A/Cs

Portable air conditioners

Inverter air conditioners

Ductless mini-split A/C units

Wifi-enabled/smart air conditioners

Solar air conditioning systems

Comparing Air Conditioners: Split vs. Window vs. Portable A/C units

Split air conditioners

Advantages of split air conditioners:

Disadvantages of split air conditioners:

Window A/C Units

Advantages of window A/C units:

Disadvantages of window A/C units:

Portables A/Cs

Advantages of portable A/Cs:

Disadvantages of portable A/Cs:

What is an evaporative cooler?

9 Ways to maximize your energy-efficient air conditioner

How to buy other appliances:

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