Not only will this leave your house warmer than you’d like, but it will also dramatically increase your energy bills and can burn out your AC unit. When an AC unit is too small for the square footage it needs to cool, it will run non-stop to cool your home. Here are some of the problems you may encounter with an AC unit that’s the wrong size: Why Is Central AC Size Important?Īir conditioning units that are too small don’t effectively cool your home, but you shouldn’t purchase one that’s too large, either. They will consider the other characteristics of your home and the condition of your ductwork to determine the exact size you need. While this measurement will give you a rough idea of the size of the AC unit you need, it’s best not to buy one without consulting an HVAC professional. For example, if a space is 1,500 square feet x 10 BTU/hour, 15,000 BTU is the minimum size of central air conditioner you want to buy. Multiply your home’s square footage – excluding the basement – by 10 BTU/hour to get a central air conditioner’s minimum cooling capacity. How to Measure What Size of AC Unit You Need However, this calculation can go up or down depending on your home’s other characteristics. In Canada, the general rule of thumb is to use 10-15 BTU/hour for every square foot of space. This measures how many square feet the unit can effectively cool. What Size Central AC Do I Need?Īir conditioner unit sizes are measured in BTU/hour. Let’s look at how to calculate what size air conditioning unit you need. The size of your home is important for deciding what size you need, but you should also consider the size of your ductwork, how much insulation you have, and how many doors and windows there are. When shopping for a central air conditioner, choosing a unit that’s the right size is critical.
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