Free Cooling
Free cooling is an energy-saving HVAC strategy that uses cool outdoor air or cool outdoor temperatures to reduce or replace mechanical refrigeration. Air-side economizers bring in outside air when conditions are right, while water-side economizers use cool ambient air to chill water without running compressors. It is most effective in climates with cooler nights or seasons.
💡 Key Takeaways
- ✓Free cooling is an energy-saving HVAC strategy that uses cool outdoor air or cool outdoor temperatures to reduce or replace mechanical refrigeration. Air-side economizers bring in outside air when conditions are right, while water-side economizers use cool ambient air to chill water without running compressors. It is most effective in climates with cooler nights or seasons.
- ✓Best savings come from proper controls and a well-sealed building envelope.
- ✓Outdoor air quality and humidity must be managed to protect indoor comfort.
- ✓Routine economizer maintenance keeps dampers and sensors working correctly.
Free Cooling
/friː ˈkuːlɪŋ/
Definition
Free cooling is an energy-saving HVAC strategy that uses cool outdoor air or cool outdoor temperatures to reduce or replace mechanical refrigeration. Air-side economizers bring in outside air when conditions are right, while water-side economizers use cool ambient air to chill water without running compressors. It is most effective in climates with cooler nights or seasons.
What is free cooling in HVAC?
It uses cool outdoor conditions to provide cooling with little or no compressor use, reducing energy costs.
Source: The Cooling Company
Quick Facts
How Free Cooling Works
Free cooling reduces compressor runtime and energy use.
Real-World Application
A commercial building uses an air-side economizer to pull in cool outdoor air during evenings, lowering indoor temperature without running the AC.
Pro Tip
Calibrate economizer controls so the system switches between free cooling and mechanical cooling based on outdoor temperature and humidity.
“Calibrate economizer controls so the system switches between free cooling and mechanical cooling based on outdoor temperature and humidity.”
Important Things to Keep in Mind
- Best savings come from proper controls and a well-sealed building envelope.
- Outdoor air quality and humidity must be managed to protect indoor comfort.
- Routine economizer maintenance keeps dampers and sensors working correctly.
Did You Know?
Building automation systems made free cooling far more reliable by optimizing when and how it runs.
FAQ
Does free cooling work in hot climates?
It can still help during cooler nights or shoulder seasons, but savings are greater in cooler climates.
Is an economizer required for free cooling?
Yes. Air-side or water-side economizers provide the controls and hardware needed.
Can free cooling impact indoor air quality?
It can if outdoor air is polluted or too humid, so controls and filtration are important.
Related Services
Need help with free cooling? Our licensed technicians in Las Vegas are ready to assist.
Share This Page
Why Homeowners Trust Us
Optimize Your HVAC System with Free Cooling
Get a Free Estimate
Fill out the form below. Our goal is to reach you within minutes.