Rooftop Make-up Air Units (RTU)

rooftop make-up air unit, rtu muaUncover the core of rooftop units with a focus on the Air Handler Unit, a critical component of our modular fan system. This unit is efficient at drawing in outside air. It can handle pressures up to 4″ W.G. and boasts capacities of up to 22,000 CFM. Due to its design, it is straightforward to access from both sides and can be easily adjusted for optimum results.

Also known as a packaged unit, the RTU offers an all-in-one solution that incorporates all its components into a single unit. Despite being located out of sight on the roof, these units play a crucial role in distributing conditioned air throughout the building.

In this article, we’ll take a closer look at how rooftop make-up air units work, their different types, and their pros and cons.

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Table of Contents

One of the reasons that RTUs are so popular is because they are self-contained, compact, and easy to install.

What are rooftop units or RTU?

Rooftop units (RTUs) are efficient heating and cooling systems atop buildings, providing climate control to designated spaces. Compact and self-contained, they house all necessary components in one unit, connected to ductwork for streamlined airflow, and are designed to withstand diverse weather conditions.
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We are the official distributors of the top rooftop make-up air unit manufacturers in the USA. As official representatives, we’ll be happy to help explain the best RTU for your application.

Contact us for a quote or if you have any questions regarding MUA.

Importance of rooftop units in HVAC systems

Installed on rooftops for space efficiency and easy maintenance, RTUs offer cost-effective HVAC solutions for commercial buildings.

Renowned for energy efficiency, they regulate temperature and humidity, enhancing indoor comfort and productivity, while also improving air quality by removing pollutants. In HVAC systems, these types of make-up air units are indispensable—comprehensive, efficient, and easy to maintain.

Make-up Air Units Help Solve a Distribution Center's Sanitation Conundrum



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We are official distributors for the manufacturers listed below. As official representatives, we’ll be happy to help explain the best rooftop make-up air unit for your application.

Contact us for a quote or any information regarding their products.

Factors to Consider

There are several important factors to consider when choosing a rooftop unit (RTU) for your HVAC system.

  1. Size: The size of the RTU is a critical factor to consider, as it must be properly sized for the specific space it will be serving. A unit that is too small will not provide adequate heating or cooling, while a unit that is too large will be inefficient and waste energy.
  2. Efficiency: Look for an RTU with a high-efficiency rating, as this can significantly reduce energy costs over time. Units with higher SEER and EER ratings can also qualify for energy rebates or incentives.
  3. Airflow: Consider the amount of airflow needed for the space, as well as the direction and velocity of the air. Proper airflow is essential for maintaining a comfortable and healthy indoor environment.
  4. Zoning capabilities: Some RTUs offer the ability to provide zoned temperature control, which can help reduce energy costs by only conditioning the areas that are in use.
  5. Maintenance requirements: Look for an RTU with easy access to filters and other components for regular maintenance and cleaning. A unit with a longer lifespan and fewer maintenance requirements will also save on long-term costs.
  6. Budget: The cost of the RTU, including installation and ongoing maintenance, is an important factor to consider when making a decision. While an RTU may have a higher upfront cost than other HVAC systems, it may provide long-term cost savings in energy efficiency and maintenance.
  7. Local codes and regulations: Be sure to check local codes and regulations to ensure that the chosen RTU meets all requirements for safety, efficiency, and environmental impact.

Considering these factors will help you choose an RTU that provides efficient and effective heating, cooling, and ventilation for your commercial building.

RTUs are known for their energy efficiency, which is essential for reducing operating costs and maintaining a comfortable indoor environment.

RTU Manufacturers We Distribute

We are the official distributors of the top-rated rooftop package manufacturers in the USA. As official representatives, we’ll be happy to help explain the best make-up air unit for your application.

Contact us for a quote or if you have any questions.


absoluteaire make up air

Setting the standard for leadership in direct-fired "total air management" systems. AbsolutAire is meeting today’s needs for cost-effective make-up air, as well as for efficient heating and ventilating.

Click to learn more about AbsoluteAire.

floaire distributors

Manufacturing quality products to meet the needs of the ventilation industry for 35 years. Continuing to invest in research and testing to improve the efficiency of our makeup air units.

Learn more about FloAire.

Our service is more than just a distribution channel; it's a partnership that aims to solve your main pain points in obtaining the products you need.

By choosing R. Williamson & Associates, you are opting for a seamless, professional, and reliable experience in industrial ventilation procurement.

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R. Williamson & Associates can provide you with fast quotes on the correct packaged RTU for your application.

We are official representative covering Illinois, Wisconsin, Minnesota, Michigan and Indiana.

We can also send out a trained specialist to assess the area and make certain the proper unit is being used for your specific application. 

We run tests on-site to see how cost effective each model will be to assure maximum efficiency.

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