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June 29, 2020 by Kevin Stepp

What is DOAS?

With Independence Day weekend approaching Americans are making plans to celebrate with cookouts, swimming, and other outdoors activities. These simple pleasures become even sweeter knowing that, when outside, we are breathing clean, fresh air. What some don’t know is that when we return to work, we are often returning to buildings that have been consciously designed to bring in fresh outdoor air. This fresh air creates cleaner and safer indoor environments. You don’t need to be in the backyard in order to breathe fresh air!

We refer to HVAC equipment specifically designed to condition outside air as DOAS equipment, or a Dedicated Outdoor Air System. The goal is to flush recirculated air from a building and replace it with clean air from outdoors. Doing so reduces the quantity of unwanted particles in the air by diluting their concentration.

How does a DOAS unit work?

While technologies and applications differ, most DOAS equipment operates on the same basic principles. Outside air, which in the summer is hotter and more humid than indoor air, must be cooled and dehumidified before being discharged into the space. If it were not, temperature and humidity in the building would skyrocket. Air passes across a cooling coil that reduces its temperature to around 50°-55°F. This process removes much of the moisture from the air. Because 50°-55° is too low to comfortably blow into a room, DOAS units often offer hot gas reheat as an option to heat the now-dry air up to a more comfortable 68-72°. Now, fresh air is ready to enter the space.

While we will likely return to work still thinking about the fun we had outdoors over the holiday, we can do so knowing that some of the outdoors is still with us.

To learn more about United CoolAir’s DOAS offerings, click the following link to our Omega Air product or call us to discuss how we can modify our other products to fit your DOAS application.

Filed Under: News Tagged With: #DOAS, #Fresh air, #hvac, #UCA

December 13, 2017 by Matt Hanson

You’ll Call it Remarkable, We Call it EZ-FIT

EZ-Fit modular floor-by-floor unit

The Variable Air Volume (VAV) VariCool® EZ-Fit unit’s specific design is for the cost-effective replacement of existing floor-by-floor or constant volume purposes. These self-contained floor-mounted systems are modular in design and consist of three or four sections. Single module sizes range in capacity from 12 – 45 tons. Individual combined modules are able to achieve 90 tons of total cooling capacity with either air or water-cooled configurations.


The EZ-Fit design is especially important in multi-floor structures with limited space and accessibility. It’s an All-Indoor Solution specifically for installation in renovation and retrofit applications.
When compared to traditional air conditioners, United CoolAir has the Lowest Installed Cost! Each of the VariCool® EZ-FIT sections is capable of fitting through a standard 3-0 doorway. The units easily negotiate corners, narrow hallways and can be placed into service elevators. The result is no building modification, fast access to the mechanical room, and no unnecessary handling, rigging, or permits.

Installations completed over the Weekend


The installation of modules happens over a weekend or during plant shutdown, minimizing disruption in services or workflow. United CoolAir custom manufactures all its equipment to the customer’s unique requirements. Utility and duct connection match the original locations eliminating costly modifications.


UCA works closely with the installer to deliver systems that coincide with the retrofi t schedule. Preplanning eliminates space issues at the job site, and system components go from truck to installation site saving valuable time and manpower. UCA’s Marvel Plus microprocessor controller is compatible with all major Building Management Systems (BMS).
To ensure fast, flawless installation, floor-by-floor factory-assembled modules, evacuation, charging, and testing occur before shipment. The disassembled units are split into three or 4 sections before shipment. Sections assemble easily and include re-sealable refrigerant fittings that maintain the factory charge.


The All Indoor installation feature has other benefits as well! To preserve the architectural integrity of the structure, all components are inside the building. No field testing is necessary since the entire system is factory tested before shipment. The VariCool EZ-FIT offers protection from the weather and vandalism extending its usable life. Furthermore, customers can achieve lower costs because routine outdoor servicing and maintenance are eliminated.

Filed Under: News Tagged With: #hvac #hvaclife #plumbing #hvactechnician #airconditioning #heating #hvactech, #UCA

October 31, 2017 by Matt Hanson

Announcing New Operations Manager at United CoolAir

Tommy Lute Operations Manager
Tommy Lute

United CoolAir is delighted to announce Tommy Lute as the new Operations Manager effective October 30, 2017.

Tommy is an experienced professional who brings over 20 years of leadership in military, business, and manufacturing. Furthermore, as Sr. Director of Design at Tait Towers, he was responsible for scheduling, design, manufacturing, integration, and delivery of custom products in the live entertainment industry. Tommy also served as Director of Engineering for Playworld. His responsibilities included all Product Development Engineering, Manufacturing Engineering, Facility and Compliance Engineering, product safety, and continuous improvements to plant activity and processes. He also worked for TE Connectivity, GE, ConAgra Foods, TRW, and Corning Cable Systems.

Tommy also served over 7 years of active duty in the US Navy. He served in Nuclear Power Program, spending most of his time aboard the USS Theodore Roosevelt, CVN-71.

Learn More

As Operations Manager Tommy will be responsible for all manufacturing activities, purchasing, shipping and receiving, inventory control and safety.

Join us as we celebrate the arrival of Tommy to the United CoolAir Team.

Filed Under: News Tagged With: #hvac, #manager, #operations, #UCA

October 5, 2017 by United CoolAir

Why Use a Commercial Portable Air Conditioner For Special Events

United CoolAir portable HVAC units

A commercial portable air conditioner is relatively compact. It’s also easy to transport and the installation takes only a few minutes, even if you’ve never done it before. This makes a commercial portable air conditioner the perfect solution to short term cooling needs. Also, it is an absolutely perfect solution for special events held in outdoor venues. In fact, this amazing technology can save the day in these cases!

How Is a Commercial Portable Air Conditioner Used?

You will often see commercial portable air conditioners set up at outdoor events where air-conditioned tents are set up. These include special events like festivals; trade shows; traveling shows; large family reunions; outdoor weddings; wedding receptions; private parties; music concerts; religious events; corporate celebrations; and even conferences. A commercial portable air conditioner can also come in handy when cooling is absolutely essential for a special event. For example, they often use these for special events involving nursing home residents or other events. This is due to elderly people being more prone to heat-related illnesses. A tent cooled by a commercial portable air conditioner can also serve as a good space for a blood drive. It can serve as a temporary place at the fairgrounds to do routine medical checkups on seniors.

Everyone Will Be Happier If You Cool Down and Dehumidify Your Space

If you are an event planner or just putting together a one-time event, the environment guests are exposed to plays a huge role in event success. For example, you can have the most beautiful bride wearing the most beautiful gown; the best band; the most spectacular flowers; and a well-planned lovely ceremony; but it will be ruined if everyone is hot and or sticky from the humidity. This is why air conditioning is so crucial at any special event. Luckily, this is something you can control with a portable unit without breaking the bank. Even if your outdoor special event is going to take place in an area that only gets into the 70 to 80-degree range; you may be surprised at how miserable people can be if the humidity is also high.

Should You Rent or Buy a Commercial Portable Air Conditioner?

While a commercial portable air conditioner is rentable, if you plan to use a commercial portable air conditioner more than a couple of times a year, it will likely be more economical for you to actually buy one. Since they are relatively compact, they don’t take much space to store. A small storage room or even a closet will suffice. Furthermore, they are not that expensive compared to a traditional HVAC system where the ducting is very expensive to install. Buying your own unit also prevents you from having to track one down every time you need it for an event.

How Many BTUs Do You Need?

As a general rule of thumb, you should plan to use about 12,000 BTU per 250 square feet of space. However, this may vary depending on the height of the space you need to cool. The ambient temperature and humidity can also play a role in the power you need. It is always best to describe the area you plan to cool to the dealer you buy or rent from. Furthermore, ask for his or her advice on what size and power commercial portable air conditioner you need to get.

A Commercial Portable Air Conditioner Can Give a Much Needed “Cool Zone”

When it comes to outdoor special events, every year people die or suffer significant illness from heatstroke and other heat-related illnesses. The United States Centers For Disease Control and Prevention (CDC) has reported that 7,233 heat-related deaths occurred in America during a ten year period from 1999 – 2009. If you are planning an outdoor event in an area with high temperatures and humidity, it is imperative you provide “cool zones”. This is where people can cool off and get their core body temperature down to prevent heatstroke. The symptoms of heatstroke include nausea, mental confusion, fever, confusion, and loss of consciousness. It is best to include at least one portable “indoor space” that is air-conditioned. In this way, people can escape the heat if they begin to feel these telltale symptoms coming on.

Filed Under: Commercial HVAC, Portable Air Conditioners Tagged With: #ac #hvaccontractor #contractor #hvacr #commercialhvac, #portables, #UCA

July 28, 2017 by United CoolAir

Advantages of Portable Commercial Air Conditioners

Therm~Air portable unit produced by United CoolAir
Portable Commercial Air Conditioner

There are many advantages to a commercial portable air conditioner. We discuss some of the most important advantages below, some of which you may not have thought of before.

How Does a Commercial Portable Air Conditioner Work?

Before we get into the advantages of these systems, let’s examine the basics of how these units work. Air from the room draws in and is first passed through a filter to prevent dust from entering the unit. This helps reduce the maintenance needed for a commercial portable air conditioner and extends its overall life as well. The air then passes through an air conditioning coil to cool the air to the appropriate temperature. Next, the internal blower shoots the cool air through supply air tubes back out into the room.

The temperature of cooled air that comes out is usually about twenty degrees cooler than the air that went in. As the temperature of the air in the room lowers, it can go through another twenty-degree drop. Thus, a room temperature beginning at 100° starts lowering to an ambient temperature of about eighty degrees cooler. Then, eighty-degree air converts into sixty-degree air. This assumes that you have bought a powerful enough unit for the room size you are cooling.

A Commercial Portable Air Conditioner Provides Convenience and Flexibility

There’s nothing more convenient than rolling in your commercial portable air conditioner to the exact location you want it. All that remains is plugging the cord into a nearby electrical outlet, and turning on your unit. There is no limitation in location by where the windows are like you are with window air conditioners, nor can window units suffice in many spaces. Moreover, you don’t have to go to the expense of cutting a hole in the wall and there are no worries about having to install ducts anywhere. Plus, you can very easily switch locations of your unit when you want to without any hassle at all. You can even take your commercial portable air conditioner to a different location as needed.

These Portable Commercial Units Offer Huge Economical Savings To Industrial Businesses

Sometimes central air conditioning isn’t economical or even possible. The cost to install an HVAC system that would actually work in a large industrial space might be astronomical. This is often true for industrial places like large warehouses, big server rooms, or giant factory floors. However, these spaces still contain products and or workers that need to be kept cool. In fact, if spaces aren’t cooled enough the products may affect productivity in a negative way. These are the types of situations where a commercial portable air conditioner can be the perfect solution.

It is also worth mentioning that a multi-functional commercial portable air conditioner can not only cool in the summer but can also heat in the winter. Some multi-functional commercial portable air conditioners, in fact, even come with the ability to act as dehumidifiers. This is especially useful for some products such as paper-based products or textiles and where both the summer and winter produce extreme temperatures.

Are There Any Other Advantages To a Portable Commercial Air Conditioner?

One advantage that not mentioned as much is the fact that the supply air tube(s) are usually adjustable. In fact, they’re as easily adjusted as adjusting the neck of a desk lamp or work lamp. This allows you to direct the cool air in exactly the direction you want it to flow. If you have a tall warehouse where heat rises, you may want to point these adjustable air supply tubes in an upwards direction to directly cool that rising warmer air. On the other hand, if you have hard-working men and women in the warehouse that really need to cool off fast, you can direct these adjustable air tubes directly at the workers, at least for a temporary time, to give them some much-needed relief. They’ll love you for it and be more productive.

Some people actually extend the supply air tubes by attaching a flex duct with a slightly larger diameter over the top of the air tubes. This allows you to direct the cool air to a precise location. For example, if you have commercial crops that are in danger of dying in an intense heatwave, you can use these extenders to cool the air right around these crops to create a “microhabitat” of cooler ambient air. The same could affect the highly sensitive technical equipment or laboratory samples during an extreme heatwave.

Filed Under: Commercial HVAC, Portable Air Conditioners Tagged With: #hvacr, #tradesman #hvacsystem #service #hvachacks, #UCA

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