Commercial HVAC Sizing Tips

If you’re getting a commercial HVAC system for your business, we urge you to take its size into consideration. It’s worth noting that bigger isn’t always better, and choosing the right equipment is vital. After all, the size may determine your unit’s performance and efficiency. In this post, your indoor air quality testing technician delves into this in detail. 

What You Should Know

Air conditioning units are typically rated in tons, with the sizes available increasing in ½-ton increments. For small buildings, the average commercial HVAC system size is around two tons, but can be as much as 30 tons for larger systems.

Professional HVAC air conditioner repair experts and technicians will calculate your building’s cooling load in BTU, or British Thermal Units, to determine the right heating and air conditioning installation size for your commercial property.

A general rule of thumb is that it takes approximately 25 BTU to heat/cool one square foot, and that one-ton units can heat/cool around 12,000 BTU per hour. Other factors can also affect your cooling loads, such as its weatherization and your building’s design. 

Why Does Proper Sizing Matter?

Choosing undersized HVAC units for your commercial property can be an issue because they’ll have a hard time heating and cooling your space efficiently. It’s likely that the units will have to work harder to keep your indoor areas at comfortable temperatures while running at their limit, which will consume more energy while also making them more susceptible to premature breakdowns.



  • An oversized unit isn’t the best choice, on the other hand, because it will cycle on and off too frequently. This could lead to more temperature swings and hot and cold spots in your commercial property.

It’s essential to maintain comfortable indoor temperatures to survive the Florida heat. When things get hot, we’ll keep you cool! With more than two decades of experience, Dittmer Air and Heat aims to care for every customer’s HVAC and restaurant refrigeration systems year-round. Call our experts at (321) 341-2810 or submit an online form to get started.