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[Infographic] Glycol in HVAC Systems

by | Jul 21, 2021


In HVAC Systems

Glycol is fluid commonly used in hydronic heating systems in cold climates to help prevent freeze damage. Simply put, glycol is antifreeze.

Coils that contain glycol can still freeze!

When glycol is improperly mixed it can cause slugs of water to travel throughout the piping. These water slugs are subject to freezing and can split a copper line.

Types of Glycol


Ethylene glycol has a high freeze point but it is highly toxic and should not be used in applications where water could be contaminated.


Propylene glycol is less toxic then ethylene glycol but with less heat transfer and a higher viscosity.

Have You Considered?

While glycol has a low freeze point, other factors should still be considered before using it for HVAC coil freeze protection such as energy + maintenance costs, toxicity levels, and corrosiveness.

Energy Costs



Did you know switching from glycol to water can save you 5-10% on energy costs?

Discover how much glycol is truly costing your facility and build a business case for switching to water protected by Cooney Freeze Block™ coils.

Invest in Sustainable Solutions for Facilities and the Environment

Invest in Sustainable Solutions for Facilities and the Environment

Earth Day is the perfect opportunity to take a stand against climate change by investing in innovative energy-efficient solutions. Cooney Engineered Solutions offer products that can help reduce energy consumption and save money. Invest in high-quality, American-made equipment that not only helps fight climate change but also provides long-term reliability. Let’s work together to build a more sustainable future this Earth Day!


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Glycol:  How Does it Impact My Buildings HVAC System?

Glycol: How Does it Impact My Buildings HVAC System?

Have a Question? Leave us a comment below!Glycol: How Does it Impact My Buildings HVAC System? We’ll be discussing how glycol impacts your HVAC system. In this webinar, you’ll learn the advantages and disadvantages of using glycol. If you are currently using glycol or...


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