Economizers in Commercial HVAC Systems
In commercial HVAC systems, efficiency and reliability are essential for maintaining comfortable indoor environments while controlling operating costs. One important component that helps achieve this balance is the economizer. While the name may sound complex, an economizer is simply a smart feature that allows commercial HVAC systems to use outdoor air to assist with cooling when conditions are right.
At Level One HVAC, we help businesses across Michigan maintain efficient, reliable HVAC systems. Understanding how an economizer works can help facility managers and building owners improve energy efficiency, reduce utility costs, and extend the life of their equipment.
What Is an Economizer in a Commercial HVAC System?
An HVAC economizer is a component commonly installed in commercial rooftop units and air handling systems that uses cool outdoor air to reduce mechanical cooling demand. Instead of relying entirely on compressors and refrigerant cycles to cool a building, an economizer allows the system to bring in outside air when it is cool enough to assist with cooling.
In simple terms, an economizer provides “free cooling” by taking advantage of favorable outdoor conditions.
Economizers are most commonly found in commercial rooftop HVAC units (RTUs), but they may also be installed in larger air handling systems used in office buildings, warehouses, hospitals, restaurants, retail spaces, and industrial facilities.
How an HVAC Economizer Works
An economizer works by monitoring outdoor air conditions and adjusting dampers to bring in outside air when it is beneficial for cooling.
Here’s a simplified breakdown of the process:
- Outdoor sensors measure temperature and sometimes humidity
- When outdoor conditions are cooler than the indoor return air, the economizer opens its dampers
- The HVAC system pulls in outdoor air to help cool the building
- Mechanical cooling (compressors) either runs less or shuts off completely
- When outdoor conditions become too warm or humid, the dampers close and the system returns to standard cooling operation
This process is typically controlled by the system’s control board or integrated into a building automation system for larger commercial facilities.
Types of Economizers
Commercial HVAC systems generally use one of two economizer control strategies.
Dry Bulb Economizer
This type operates based solely on outdoor air temperature. When the outdoor temperature is below a preset threshold, the economizer opens to bring in outside air.
Enthalpy Economizer
An enthalpy economizer measures both temperature and humidity to determine whether outside air is suitable for cooling. This approach is often more effective in climates where humidity levels fluctuate.
Some modern systems use dual enthalpy controls, comparing both indoor and outdoor air conditions to determine the most efficient operating mode.
Benefits of Using an Economizer
When properly installed and maintained, economizers provide several important benefits for commercial facilities.
Lower Energy Costs
By reducing the need for mechanical cooling, economizers can significantly decrease energy consumption during cooler weather or overnight conditions.
Reduced Equipment Wear
Because compressors run less frequently, economizers can extend the lifespan of HVAC equipment and reduce long-term maintenance costs.
Improved Indoor Air Quality
Economizers bring in fresh outdoor air, helping improve ventilation and reduce indoor contaminants.
Increased System Efficiency
Buildings that utilize economizers often see improved overall HVAC performance and efficiency, especially during seasonal temperature changes common in Michigan.
Common Economizer Problems
Although economizers are extremely valuable components, they can become inefficient if they are not inspected and maintained regularly.
Some common issues include:
- Stuck or broken dampers
- Faulty temperature or humidity sensors
- Improper calibration
- Failed actuators
- Damaged linkage or mechanical components
- Incorrect control settings
In many commercial buildings, economizers are one of the most commonly malfunctioning HVAC components, often going unnoticed because the system continues to operate—just less efficiently. Routine commercial HVAC maintenance helps ensure these systems operate as intended.
Serving Commercial HVAC Customers Across Michigan
At Level One HVAC, we provide expert commercial HVAC service, installation, and maintenance for businesses across the entire state of Michigan. Our team understands the demands that Michigan’s seasonal temperature swings place on commercial HVAC systems, including components like economizers that help maximize efficiency during cooler months.
With three strategic service locations, we are able to respond quickly to commercial facilities throughout the state:
- Detroit / Southeast Michigan
- Grand Rapids / West Michigan
- West Branch / Northern Michigan
This statewide coverage allows us to support a wide range of industries and facilities, from large metropolitan buildings to businesses in smaller communities.
Our technicians work with a wide variety of commercial HVAC equipment, including rooftop units, make-up air systems, building automation systems, refrigeration equipment, and advanced control systems. Whether your system needs economizer repairs, routine maintenance, or a full system upgrade, Level One HVAC has the expertise to help keep your building operating efficiently.
Keep Your Commercial HVAC System Running Efficiently
Economizers are an excellent way for commercial HVAC systems to take advantage of cooler outdoor temperatures and reduce energy costs. However, like any HVAC component, they must be properly installed, calibrated, and maintained to deliver their full benefits.
If your facility hasn’t had its economizer inspected recently, it may be missing out on valuable efficiency improvements.
Level One HVAC proudly serves commercial customers across all of Michigan, helping businesses maintain reliable, high-performing HVAC systems year-round.
If you suspect an issue with your economizer or want to improve the efficiency of your commercial HVAC equipment, our experienced technicians are ready to help.
Serving all of Michigan
Call: 844-616-4822