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What Size PTAC Do I Need?

PTAC Sizing Calculator

Product Expert

Packaged terminal air conditioners (PTAC) are perfect additions to homes, offices, high-rises, or anywhere it's difficult to keep a comfortable temperature.

Sizing your PTAC correctly is a vital step in the PTAC buying process. If done incorrectly, your comfort and savings could be at risk.

If your PTAC it is too small, you'll find your unit running and running, all the while never reaching that temperature you desire. Beyond just negatively impacting your comfort, your PTAC may suffer physically from the extra wear and tear it experiences while running non-stop.

If it is sized too big, you'll likely experience temperature swings and decreased energy efficiency as your unit cycles on and off too frequently. Just like constant running of your PTAC, frequent starting and stopping, known as short-cycling, could damage your system over time. Short-cycling is also very inefficient, costing you more money than necessary over a long time period.

It's easy to be lured into using simple, rule-of-thumb sizing methods, such as square footage, to size your PTAC. Unfortunately, there are many other factors that can come into play and greatly impact your BTU requirements, such as climate, building materials, and more.

Lucky for you, we have a solution - our online PTAC sizing calculator. Our proprietary software will lead you through some brief, yet specific, questions about your space and provide the best sizing estimate you'll find from any online tool.

PTAC Sizing Calculator >

Need a More Precise Measurement?
We're here to help you get the exact product for your needs. If you need a sizing calculation more precise than what our online tool provides, give us a call at 866-554-4328 and our engineers can provide a complete, professional sizing for your space at no cost to you.

Because of the detailed work involved, these sizings take about 3-5 business days to complete. To get a head start, please fill out our sizing worksheet and send it back completed to or by fax to 1-866-554-4365.

NEXT: How To Pick The Perfect PTAC

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