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Every business owner needs an effective HVAC system to keep things running properly. Imagine a restaurant in the dead of summer without any air conditioning. How likely are their patrons to return the next time it’s a hot day? Without properly functioning equipment, businesses lose money and are unable to function. Unfortunately, most people don’t know anything about commercial HVAC systems before becoming business owners.

To address this situation, we’ve started a commercial HVAC for dummies series, complete with helpful information on a variety of subtopics. Keep reading below for a basic introduction to the topic along with useful links to more detailed information along the way.

The Most Common Commercial HVAC Systems

Commercial HVAC Air Duct To understand how a commercial HVAC system works, we’ll look first at the most common systems. The two main categories of system that you’ll find in commercial spaces are central heating and cooling systems, and systems that are designed for individual rooms. Within each of those categories, there are many variations that we’ve covered in depth elsewhere. For now, we’ll focus on the most common styles:

Central air is the original option that showed up in many businesses and buildings beginning in the 20th century. While it was initially built around a heater passing warm air through a series of ducts, it was adapted to cool using a refrigerant and an exterior, split unit. Some modern versions of heating systems that you may find are heat pumps, which transfer heat between places using water as a medium (and thus move it away from where you’d like to cool), and evaporative cooling systems, which are generally only used in warm, dry climates.

Room-specific systems can be repeated for more extensive commercial settings or offices in situations where there’s no opportunity for a central air infrastructure. Alternatively, some businesses use individual systems to supplement a central system in rooms that require extra attention, such as kitchens and computer centers. The most common kind of these systems is the mini-split, which functions in the same way that central cooling does, but on a much smaller scale.

Commercial HVAC for Dummies: Benefiting from Your System

Ultimately, the most essential factors in   are how expensive they are and how effective they are. Depending on your situation, these two considerations may not scale poorly. For example, in a warm, dry climate, an evaporative cooling system is both effective at doing its job and relatively inexpensive to operate. On the other hand, in very cold climates, you may have fewer effective options regarding how you heat your business.

The commercial HVAC for dummies overview of these systems is that an efficient system, such as a heat pump, will generally cost much more to install, but will cost significantly less during its operation. Using a series of mini-split systems can save a lot of money on installation, but will operate much less efficiently, meaning your power bills will be commensurately higher.

Often, the main factors for whether a system will serve adequately are apparent. If you live in a climate that is exceptionally hot, humid, or both, then you may have no choice but to install a central air system and couple it with several mini-split systems to ensure that your clientele and staff are kept cool. In more temperate, dry climates, however, you may be able to operate with a high-efficiency heat pump system.

Dust Mites in your HVAC Ducts

Maintenance and What to Do When Things Go Wrong

Each kind of commercial HVAC system will have a unique approach to maintenance. For example, central air systems use air filters to reduce allergens and other air quality imperfections. These filters must be changed regularly, such as once monthly. While that kind of maintenance is easy for staff or owners to handle themselves, other forms of regular maintenance need a professional approach. Specifically, your ducts must remain free of obstructions and mold growth if you want them to function properly. Professional HVAC contractors can help you by cleaning out these ducts every year or two.

Similarly, if your system stops working or suffers physical damage, that kind of maintenance is outside the capacity of most people. Don’t take the risk of making the damage worse. Instead, immediately contact your HVAC contractor to examine the situation and provide the necessary maintenance or repairs.

Taking the Next Step: Commercial HVAC for Dummies

If you’d like to explore any of these topics further, make sure that you explore our helpful blog. We exhaustively detail the essential differences between each kind of HVAC system as well as how to provide essential maintenance. This guide, commercial HVAC for dummies, is an excellent starting point for anyone new to managing a business or just learning about their commercial HVAC system. Remember that, as always, the best way to get accurate information regarding your HVAC system options is to speak to a licensed contractor who visits your location.

Reaching the understanding that your business needs a new HVAC solution is only one half of the battle. Once you’ve determined your existing system requires replacement, or as you approach opening a new location, it’s time to move on to the next big question: what system will you choose? This decision-making process involves many steps, but it’s not yet time to start thinking about brand names and installation, and you can’t just run out and purchase the most powerful unit you can find. Instead, correctly determining the right HVAC system size for your business is the first thing that should be on your list. How do you go about that?

Understanding Your Building’s Heating and Cooling Load

hvac system sizeTo HVAC professionals, the word “load” is an important term — it’s a simple way of expressing the amount of heating or cooling capability the building needs using real numbers. Compare this with “capacity,” which is the amount of cooling power a unit can pump out when it works its hardest. Choosing the correct HVAC system size is all about balancing load versus capacity. However, load is not necessarily an easy concept to get your mind around; it can vary from room to room in your building, and it changes with the weather or the time of year.

Taking all of this into account, you’ll soon discover that having a fundamental understanding of heating and cooling zones is essential. Consider that you may need multiple units to cool the entire building effectively. Rooms on sides of the building which receive large amounts of direct sunlight, for example, will likely have a higher load than an interior room with no windows. Rooftop units can help you establish appropriate zones with ease, but so too can other systems.

All these factors make determining the appropriate HVAC size less about reading labels and more about math. That doesn’t mean you can’t even begin to develop a sense of the investment your new system requires, however. While calculating your exact building load and the appropriate unit capacity is something best left to the professionals, you aren’t without tools: there is a helpful way to ballpark your needs.

Use this Formula for a Basic Idea of Sizing

To sketch out a very rough idea of how much power your new HVAC system will need to cool the entire building properly, follow these steps.

  1. Determine the total square footage of spaces to receive cooling. Keep in mind that your calculation here will need to make some assumptions, such as a standard ceiling height, and that variations will impact the real numbers you need.

 

  1. Multiply the square footage by 25. The resulting number is a rough estimate of the total number of BTUs (British thermal units) required to heat or cool the space properly.

 

  1. Adjust as necessary. Add approximately 600 BTU to your number per person employed in the building and working there daily. People give off a lot of body heat, and your system will need to compensate for that.

 

Keep in mind that you will encounter units whose power is expressed not in BTUs, but tons — referring to a unit of 12,000 BTUs, not a measure of weight. Simply divide BTUs by 12,000 to find tonnage. With the resulting number, you have a rough idea of what you’ll need and can begin the procurement process. When you get in touch with HVAC professionals, let them know about your calculations. They can then help conduct a more accurate assessment using a Manual J calculation.

Dust Mites in your HVAC Ducts

HVAC System Size Matters — So Choose Wisely

Why can’t you simply look to purchase a unit without these calculations? An improperly sized HVAC system will face numerous concerns. Not only will it struggle to cool your space in the height of summer, but you are also more likely to encounter persistent maintenance needs. When a system struggles to meet your cooling demands, its components wear out much faster. Likewise, a system that is too large will represent a negative impact on your energy expenditures while also providing less than adequate performance. Understanding how to size your system correctly is, therefore, a vital step to take.

Ultimately, while the formula supplied above will allow you to make a rough estimate of the HVAC system size you’ll require, it won’t lead you directly to the right unit. That’s the job of a professional — to ensure that not only you make a correct choice, but one that will allow you to enjoy consistent, reliable operations for years to come. With so many different types of commercial HVAC systems out there, too, others differences can have an impact on the size you’ll really need. For a more definite answer, (connect with a reputable service provider) in your area and share your thoughts, needs, and concerns.