Calculating the Size of A/C for Your Home

Summer is coming quickly, and the one thing you likely want more than anything else is an A/C unit that will keep you cool throughout the heat of a Phoenix summer. If your’s had trouble keeping up last year, you may be wondering whether or not it’s actually big enough to cool your home. Understanding exactly how central air conditioners are sized can help you get a better idea of whether yours is actually big enough.

The Basic Estimate

To understand what size unit you need, you need to understand how they are sold. A/C units are measured in tons, but it’s not a weight measurement in this case – it’s a measurement of the unit’s ability to cool. One ton has the ability to cool 12,000 BTUs in an hour. A two ton unit doubles that. Not sure what those BTUs mean? BTU stands for “British Thermal Unit,” and it measures the amount of energy required to cool a pound of water by a single degree.

In the world of home air conditioning units, you can buy units between one and five tons. They increase in half-ton increments. To decide exactly how much cooling power you need, take your home’s square footage and multiply it by 25. Then divide that by 12,000. Finally, subtract .5 from that equation. So, for a 1,500 square foot home, you would need a 2.5 or 3 ton central air unit.

Something More Complex

You’ll certainly want to contact a professional HVAC company like R&R Refrigeration to help with further, more complex calculations. Learn more about whether your unit is big enough when you call us today.