Commercial or industrial HVAC systems control temperature, humidity, and airflow inside large spaces. But these machines do a lot more besides creating a comfortable indoor atmosphere. They also improve energy efficiency in large buildings and provide a conducive work environment.
As you can imagine, commercial building HVAC systems are behemoths compared to their residential counterparts. They are much more robust, with enough capacities and oomph to service dozens of rooms at once. Commercial HVAC units are also more complex in terms of design, installation, and maintenance.
In this article, we’ll go over the nitty-gritty of commercial HVAC. It covers the basics of commercial heating and cooling, answering questions like:
- How do HVAC systems for commercial buildings work?
- What types of HVAC systems for commercial buildings are out there?
- What are the key components of a commercial HVAC system?
We’ll also guide you on how to choose the right equipment. And, we’ll share tips for improving your HVAC service quality.
It’s a worthwhile read if you’re looking to venture into the HVAC business or learn more about commercial heating and cooling.
What Are Commercial HVAC Systems?
Commercial HVAC systems are large-scale heating, ventilation, and air conditioning systems. They are designed to control indoor atmospheres in commercial or industrial buildings. You can expect to find them in large spaces that house lots of people at a time. These are places like schools, malls, warehouses, hotels, hospitals, and office buildings.
Commercial HVAC vs. Residential HVAC: What’s the Difference?
For starters, commercial HVAC systems are much larger and more powerful than residential HVAC systems. They operate a bit differently too.
Below is a table summarizing the key differences between commercial and residential HVAC systems:
| COMMERCIAL HVAC SYSTEM | RESIDENTIAL HVAC SYSTEM |
| Large heating and cooling capacity (10–100 tons) | Lower heating and cooling capacity, typically maxing out at 5 tons |
| Highly customizable and scalable modular designs | Compact, integrated units with limited customization options |
| Incorporate loud commercial HVAC equipment, often installed in designated areas | Use relatively quiet equipment installed near or within dwelling spaces |
| Build for continuous operation. Some run 24/7. | Built to run intermittently, with most only operating a few hours at a time |
| Can handle dozens of zones with varying HVAC settings | Most residential HVAC systems can only provide two or three zones |
| Utilize more sophisticated cooling, heating, ventilation, and air purification methods | Use simple technologies to cool and heat homes |
| High upfront, operating, and servicing costs due to larger power and servicing demands | Much lower costs since the units are smaller, easier to service, and consume less power |
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The Key Functions of Commercial HVAC
HVAC stands for heating, ventilation, and air conditioning. And that’s exactly what HVACs for commercial buildings do. Except there’s more to it than that.
- Heating: Heat pumps and furnaces keep the interior warm and cozy during cold nights and chilly weather.
- Ventilation: This is also called airflow management. Fans and a vast network of vents circulate air within the building. HVAC ventilators bring in fresh, filtered air and get rid of stale or contaminated indoor air.
- Air conditioning: During the warm months, commercial HVACs work throughout the hot days to get rid of the heat. Cooling is typically done using heavy-duty heat pumps.
- Air quality management: Filters in vents and airways capture dust, allergens, and other pollutants in the air. This purifies the indoor air, making it breathable and safe.
- Humidity control: Humidifiers and dehumidifiers regulate moisture levels in the air. The sweet spot is 40-60% relative humidity.
- Zoning: Commercial HVAC systems offer precise climate control for different parts of a large building. For example, office HVAC systems can have different settings for different offices depending on occupancy, locations, and personal preferences.
- Energy management: Heating, cooling, and ventilating large buildings takes a lot of energy. HVAC systems make up about 40% of a building’s total energy consumption. Fortunately, commercial HVAC units are equipped with high-tech sensors and energy recovery systems that optimize energy usage. In fact, some of them meet ASHRAE Standard 90.1 codes for efficient energy usage.
Why Commercial HVAC Is Crucial for Building Comfort and Safety
Did you know that HVAC technicians are considered “essential workers?” That’s true, which makes HVAC an essential service, and rightfully so.
We cannot overstate the importance of HVAC, especially in crowded commercial buildings. Firstly, HVAC ensures indoor comfort. Regardless of how big the building is or how many people are inside, a capable HVAC system maintains the ideal temperature, humidity, and air quality levels. The second reason has to do with safety.
An HVAC system plays a crucial role in safeguarding the health and safety of a building’s occupants. An estimated 3.8 million people worldwide die due to harmful indoor air. Improper air circulation, temperature, and humidity levels can cause all sorts of health problems. For example, very high humidity can encourage mold growth, which then poisons the air with harmful spores.
Installing an HVAC system in a commercial building eliminates serious health risks. It mitigates safety risks, too, like moisture condensation on floors, walls, and electronics.
So, HVAC systems are not just for comfort. In commercial spaces, HVAC systems are crucial health and safety measures too.
Common Components in Commercial HVAC
Here’s a breakdown of the standard components in a commercial HVAC system.
Air Handling Units (AHUs)
AHUs are responsible for internal air circulation. Most AHUs have fans, coils, and dampers. These help supply cleaned, heated/cooled air to various zones and draw contaminated air out.
Ductwork and Distribution
Ducts distribute air to and from various zones. HVAC ducts are installed in the ceiling or crawl spaces. On one end may be an AHU and a diffuser on the other.
Thermostats and Controls
A thermostat allows users to set HVAC parameters (temperature, humidity, airflow, etc.). The controls basically translate thermostat settings to HVAC components.
Filters and IAQ Components
Filters, humidifiers, dehumidifiers, and air purifiers clean the air supply. This could be recirculated indoor air or outside air coming into the building. IAQ components remove harmful contaminants (VOCs, allergens, dust, etc.) from the air.
Sensors, Dampers, and Zone Controls
Every zone can control various HVAC parameters. This can be achieved using sensors, thermostats, control panels, or even smartphone apps.
Major Types of Commercial HVAC Systems
Commercial HVAC systems come in different builds, designs, and performance specs. Let’s look at the six common commercial HVAC system types.
Packaged HVAC Systems
A packaged system is an all-in-one HVAC unit. A single compact system houses all the temperature, humidity, and airflow components. These are built as boxes or cabinets that sit outdoors, close to the building.
Packaged HVAC designs are meant to take up as little space as possible. They are also pretty convenient when it comes to installation and servicing. All you have to do is power it on and hook it up to the building. And having everything neatly in one place makes it easy to troubleshoot and service various components at once.
Rooftop Units (RTUs)
RTUs are very popular in commercial buildings. They are a type of packaged HVAC system mounted on rooftops. Again, these are all-in-one HVAC units with the compressor, condenser, evaporator, blower, and everything else inside a compact box.
You need a flat, sturdy roof to install this type of HVAC system. They may also take up quite a lot of space on the rooftop. Normally, due to their compact design, each unit can only handle a few HVAC zones. So, depending on the building’s size and its HVAC needs, you may have to install multiple units.
Split Systems (Air Handlers + Condensers)
As the name suggests, split systems have separate components. The most common configuration is where you have an outdoor compressor unit and an indoor air handler.
The indoor unit comprises the evaporator and blower fan. It circulates air inside the building’s vent work. It also blows air over the evaporator coil and furnace to cool or warm it up. The outdoor unit only has a heat pump. The two are connected via insulated refrigerant lines.
Since the compressor sits outside, split systems run very quietly. They are also flexible to install and energy efficient. However, they work best in small spaces such as restaurants, offices, and retail stores.
Variable Air Volume (VAV) Systems
VAV systems adjust cooling, heating, and ventilation by adjusting air flow rather than changing the air temperature. This is a much more efficient way to run HVAC. Plus, it allows for extensive zoning. That’s why this type of HVAC system is so popular in large buildings with numerous dwelling spaces.
Here’s how a VAV system works.
The central air handling unit (AHU) pushes clean air at a temperature of about 55°F (13°C) down the central supply duct. The supply duct branches off into smaller zones. Along each duct leading to a zone is a VAV box/terminal. Inside this box is a motorized damper that controls airflow into the zone using sensor and thermostat inputs.
If a particular zone is set to “cool,” the damper lets out more of the chilled air. If the zone is too cold, the damper closes to let less air through the diffusers. However, some VAV boxes have heaters that warm up the air going into cold zones.
A fan then pulls air from the various zones through the return duct. The returning air is purified, and the cycle continues.
Chilled Water Systems and Boilers
Chilled water systems and boilers use water as the heat transfer medium, rather than air. Water happens to transfer heat much better than air. For that reason, these HVAC systems are incredibly efficient, ideal for large spaces with multiple zones.
The chilled water system cools the air. Chilled water, cooled via refrigeration cycles, is pumped through insulated pipes to an air handling unit. The AHU has a heat exchanger that pulls heat from passing air, thus cooling it.
The boiler, on the other hand, heats water. Once heated, the hot water travels to the AHU, where it warms up the air.
Usually, water boilers and chillers are integrated into one system. Both units can share the same piping network, heat exchangers, and AHU.
VRF/VRV Systems (Variable Refrigerant Flow/Volume)
Variable refrigerant flow (VRF) is a relatively new technology in the US. But it’s starting to catch on among large commercial establishments.
VRFs are more advanced than other commercial HVAC system types. They manage precise zoned heating and cooling by varying the amount of refrigerant flowing in the system.
These are split systems. The compressor sits in the outdoor unit. This compressor uses an inverter to automatically throttle its speed depending on heat load demands. Variable compression adjusts the flow of refrigerant.
The refrigerant makes its way indoors to individual AHUs in specific zones. Valves and controllers direct the refrigerant to the zones needing cooling or heating.
VRFs are highly efficient since the compressor runs only as needed. Also, they achieve zoned heating and cooling without using ducts.
Choosing the Right System for Your Building
How do you choose the best HVAC system for your building? Well, consider the following factors when shopping for commercial HVAC equipment.
Building Size and Occupancy Considerations
A larger building housing more people will obviously need a more capable HVAC installation, and vice versa. Calculate the HVAC load based on variables like square footage, foot traffic, work hours, and peak occupancy.
Consider also the activities that take place in the building. For example, a warehouse won’t have the same HVAC demands as a similarly-sized and occupied restaurant.
Climate, Energy Efficiency, and Zoning
The location’s climate significantly affects HVAC loading in commercial buildings. Take a place like Phoenix, Arizona. There, average daily temperatures can reach highs of 106°F. That means you’d need an HVAC unit with robust and reliable cooling.
Keep in mind that energy efficiency varies widely between HVAC units. Ideally, you want the most efficient systems you can find. However, efficiency often comes with other tradeoffs, such as high initial cost and complexity.
HVAC efficiency is closely tied to zoning. The number of zones you want may very well determine the system’s cost and efficiency. Find an option that meets your zoning needs while minimizing the HVAC footprint.
Cost, Installation, and Lifecycle Considerations
How much are you willing to pay for HVAC? In a commercial setting, cost is always going to be a major HVAC decision factor.
It’s not so much about cheaping out, but rather optimizing the expenditure. In short, pay for exactly what you need. Don’t overpay for a massive system that goes underutilized while costing a fortune to run.
Cost goes beyond the initial investment. Consider also the unit’s installation requirement, ease of maintenance, and durability. Choose an HVAC system that’s a worthwhile investment in the long run.
Future Proofing and Smart Building Integration
A lot is changing in the real estate industry. Buildings are becoming more energy efficient, environmentally friendly, and safer. HVAC systems must catch up with modern trends, and some are doing that. But there are still some old-fashioned HVAC systems in the market.
Get a future-proof HVAC system. That means going for models featuring the latest HVAC methods and technologies. One of those technologies is smart integration. Some modern HVAC systems have intelligent controls and sensors that make them more efficient and convenient.
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FAQs About Commercial Building HVAC Systems
What is the typical lifespan of a commercial HVAC system?
Commercial HVAC systems last anywhere between 10 and 25 years. Life expectancy depends on the HVAC type, usage, maintenance cycles, and where it’s installed.
How often should commercial HVAC equipment be serviced?
Commercial HVAC systems need routine servicing at least twice a year, particularly at the onset of summer and winter seasons. More frequent servicing may be required in sensitive or high-demand places like hospitals.
What’s the difference between RTU and split systems?
RTUs are compact, all-in-one, roof-mounted HVAC units. Meanwhile, split systems have a separate outdoor unit and indoor unit.
Can a commercial HVAC system save on energy costs?
Yes, it can. Modern commercial HVAC systems are equipped with advanced energy-saving features such as smart controls, variable-speed compressors, and energy recovery ventilators.
Are VRF systems better than traditional packaged units?
In some ways, yes, VRFs are better than traditional packaged systems. VRFs are more flexible and efficient. They can also serve larger spaces with multiple zones.
What maintenance is essential after installation?
Basic routine maintenance is essential for extending the life of an HVAC unit. It’s important to regularly change filters, lubricate moving parts, check for wear, top up fluids, clean vents, and so on.
Does commercial HVAC affect indoor air quality?
Yes, but in a good way. HVAC systems for commercial buildings improve indoor air quality by removing contaminants and balancing humidity levels.
Conclusion and Next Steps
There you have it for commercial HVAC types, components, and considerations. Here’s a quick recap of what we’ve just learned, plus some additional tips and info.
Quick Review of Key System Types
Commercial HVAC system types include:
- Packaged HVAC systems: All-in-one HVAC units featuring a compact build and design
- Rooftop units: Compact HVAC units mounted on rooftops
- Split systems: Have separate outdoor (condenser) and indoor (air handler) components
- Variable air volume (VAV) systems: Cool and heat zones by adjusting the air flow
- Chilled water systems and boilers: Use water as the heat transfer medium rather than air
- Variable refrigerant flow (VRF) systems: Advanced systems that achieve precise, ductless zoning by varying refrigerant flow from the compressor
Checklist for Selecting and Maintaining Commercial HVAC
Choose a commercial HVAC system that meets the following criteria:
- Enough capacity and power for the building in question
- Able to cope and perform in the region’s climate
- Flexible enough to allow the required zoning
- Good value for money
- Easy to install, run, and maintain
- Reasonably energy efficient
- Scalable to meet changing HVAC loading
- Compatible with modern energy efficiency and sustainability solutions
Follow this checklist for maintaining commercial HVAC units:
- Create a routine maintenance schedule.
- Check HVAC settings, controls, and sensors.
- Lubricate moving parts.
- Change out filters.
- Clean vents, fan blades, and coils.
- Check refrigerant levels and top up as needed.
- Flush condensate drain lines.
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