How do you know which cooling system is right when they all promise to help keep you cool? While it may seem like any room air conditioner might do, it’s important to do your research so you can choose the right unit that will not just keep you cool, but help you save on energy costs too.
When it comes to room ACs, bigger is not always better. In fact, an AC that is 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, which is indicated by British thermal units (BTUs/hour). As a rule of thumb, average 20 BTUs for each square foot of living space. Once you’ve determined the BTUs, you’ll need to factor in a few other considerations, like windows and ceiling height:
If you’re still not sure, consult a certified air conditioning contractor they can help you in choosing the right sized unit for your space.
There are a variety of room air conditioners available on the market. Before purchasing, familiarize yourself with the different types and their available features:
Window AC units can cool rooms from 100 square feet to 650 square feet. Check the BTUs to determine if your space needs a small, medium or large AC unit to cool the room properly. Small-to-medium sized units are relatively easy to install, but larger window units may require installation by a contractor. All units can typically be installed in single or double hung windows, and most come with adjustable panels that ensure the AC is properly fitted to your window, reducing the risk of air leaks.
These AC units 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.
Split ductless air conditioners are a great way to cool multiple rooms without having to install multiple window units or the ductwork needed for central air conditioning. Upfront costs may be higher than alternatives and you'll require a contractor to install the system, but these units are typically more energy efficient and have additional features like air filtration.
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There are two labels to look out for when identifying the energy efficiency of a model, the ENERGY STAR® label and the ENERGUIDE label.
ENERGY STAR label: this designation helps you identify systems that provide the best performance while using the least amount of energy. On average these models use ten per cent less energy than other standard models.
ENERGUIDE label: This label includes the model type and its energy efficiency ratio (EER). The higher the ratio number the more efficient it is. The label includes a EER scale to show you the range available for similar models, as well as an indicator that shows where the model falls on the scale.
Keep an eye out for other energy-efficiency features like an energy-saving setting. This feature allows the unit to operate at a low setting keeping the room comfortable while using less energy. Or look for a model with a timer which allows you to set when you want the AC to be working, letting you keep cool when you need it without having to constantly run the unit.
As you set out on your hunt for the perfect room AC, remember to ask questions. Certified air conditioning contractors can help you find what you’re looking for, and may also help you properly install a unit. The ENERGY STAR® Product Finder tool is also a great resource that allows you to compare different energy-efficient makes and models, which will make your purchasing decision easier.