Valley Mechanical is a leading HVAC maintenance, repair, and installation provider here in San Jose, and while we are the pro’s when it comes to commercial HVAC, it can be tricky when not every business or building requires the same size of unit. If you are the owner of a business and are wondering what size of HVAC unit you need for your building, then there are a few things that you need to take into consideration and Valley Mechanical is here to help.


One of the first ways that you’ll determine if a commercial company is the right fit for you is by understanding whether or not you need one unit or multiple. If you’re only in need of one unit, then you a commercial company might not be the best fit. If you are in need of cooling a large amount of space that will require more than one unit, then Valley Mechanical is the group to call.


The best way to determine how many units that you’ll need is to understand how much space you need to be cooled. Depending on whether or not the space is broken out into zones is usually the best way to do this, but there are a few other significant signs you can look for in a space. Start by asking yourself a few of these questions:

  • Are you cooling more than one floor?
  • Are there various rooms on each floor?
  • Are there separate zones that you need to cool?
  • Are there currently more than one unit?
  • Are you in charge of cooling for the entire building?

These are just some basic questions, and they aren’t the only ones that matter. However, these questions should help you narrow down if you need to simply have one unit looked at, installed or repaired, or if it’s going to be more than one unit you’re calling our team for assistance with.


Once you’ve got a better grip on the amount of space that you’ll be cooling, there’s actually a formula that you can use to have a direct answer on how many units you’ll need. Start by figuring out the amount of square footage that you’ll have to cool. Once you’ve got that figured out, multiply the square footage of each area by 25. Then add 400 for each person that will be working within that space, for each window in the area add 1,000. Once you total up these numbers, you’ll have the absolute minimum BTU’s that the space will require. From there, you can start looking more specifically at units that will provide that amount.

Valley Mechanical will do all the dirty work when it comes to finding the right unit, but through these few steps, you should have a better idea of what you can do to make the process of finding the right unit easier. Call our team today so that we can ensure your San Jose business is taken care of this season.