HFC vs. HFO Closed-Cell Spray Foam: Making the Switch Towards Eco-Friendly Insulation


When it comes to insulating homes and buildings, spray foam has emerged as an efficient and effective solution. It provides superior thermal insulation, air sealing, and moisture control, contributing to energy savings and enhanced comfort. However, traditional closed-cell spray foam formulations based on hydrofluorocarbon (HFC) blowing agents have raised environmental concerns due to their high global warming potential. In response to this, manufacturers like Accufoam have developed alternatives using hydrofluoroolefin (HFO) blowing agents, a more eco-friendly option. Below we will explore the differences between HFC and HFO closed-cell spray foam, shedding light on their environmental impact and performance. 

Understanding the Basics 

Before diving into the differences between HFC and HFO closed-cell spray foam, it is essential to understand the basics of their chemical composition and their role as blowing agents. 

Hydrofluorocarbons (HFCs): HFCs are synthetic compounds composed of hydrogen, fluorine, and carbon atoms. They were initially introduced as replacements for ozone-depleting substances like chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). While HFCs do not deplete the ozone layer, they have a significant impact on global warming due to their high Global Warming Potential (GWP). 

Hydrofluoroolefins (HFOs): HFOs, on the other hand, are also synthetic compounds containing hydrogen, fluorine, and carbon atoms. Although similar, they are considered the next generation of blowing agents and are designed to have a much lower GWP compared to HFCs. HFOs have a shorter atmospheric lifetime, which means they break down more rapidly, minimizing their environmental impact. 

Environmental Impact 

The most significant difference between HFC and HFO closed-cell spray foam lies in their effects on the environment. 

HFC Spray Foam: HFCs are potent greenhouse gases, with GWPs thousands of times higher than carbon dioxide. Once released into the atmosphere, HFCs trap heat, contributing to global warming and climate change. Despite their ozone-friendly nature, HFCs pose a considerable threat to the environment in terms of their GWP. 

HFO Spray Foam: HFOs are designed to address the environmental concerns associated with HFCs. They have extremely low GWPs, often less than 1, making them far less impactful on global warming. The adoption of HFO blowing agents is a significant step towards reducing the carbon footprint of spray foam insulation. 


Apart from their environmental impact, HFC and HFO spray foams differ in terms of their performance characteristics. 

HFC Spray Foam: HFC-based closed-cell spray foam is an effective insulator with excellent thermal resistance and air sealing properties. It efficiently fills gaps and voids, providing a continuous and airtight barrier. However, its high GWP has prompted the search for more sustainable alternatives. 

HFO Spray Foam: HFO-based closed-cell spray foam retains the same excellent insulating and air sealing capabilities as HFC spray foam. Moreover, some studies suggest that HFO formulations might have improved thermal stability and adhesion properties. For instance, Accufoam’s HFO formulation provides an increased R-value over the current HFC formulation. This ensures that buildings and homes insulated with HFO spray foam enjoy the same level of comfort and energy efficiency. 

Building Codes and Regulations 

As environmental concerns have grown, various regions and countries have implemented regulations to limit the use of high-GWP substances. 

HFC Spray Foam: Due to the high GWP of HFCs, many countries have started phasing out their use in certain applications. This has led to a shift in the industry towards more eco-friendly alternatives. 

HFO Spray Foam: HFO spray foam aligns with the global efforts to reduce greenhouse gas emissions. As a result, it meets current and future regulations and standards for environmentally friendly construction materials. 

The difference between HFC and HFO closed-cell spray foam lies primarily in their environmental impact. HFC spray foam, while an effective insulator, has a high Global Warming Potential and contributes significantly to climate change. On the other hand, HFO spray foam offers an eco-friendly alternative with a substantially lower GWP and maintains the same or greater level of performance as HFC foam. 

In the United States, HFC blowing agents used in closed-cell spray foam insulation are progressively being phased out in the years to come; however, here at Accufoam, we are staying ahead of the game. With our HFO closed-cell spray foam already available, we are committed to phasing out our HFC products as soon as possible. Along with our product’s GreenGuard Gold certification and excellent re-entry/re-occupancy times, Accufoam has positioned itself as an industry leader in environmental sustainability.  

As we strive to create more sustainable and energy-efficient buildings, the adoption of HFO closed-cell spray foam represents a step forward in mitigating environmental impact. With the right choice of insulation materials, we can build greener and more comfortable spaces while safeguarding our planet for future generations.

For more information on Accufoam’s Closed-Cell HFO product, click here!