Is Your HVAC System A2L Ready?

Reading Time: 3 minutes

If you’re in design or pre-con on any project right now, pay attention.

New code requirements for A2L refrigerants are here—and they’re already impacting the HVAC systems you can specify and install.

 

Why This Matters

A2L refrigerants are replacing the older ones being phased out due to environmental regulations. But there’s a catch: A2Ls are mildly flammable, which triggers new mechanical, electrical, and fire safety code requirements—especially for hotels, apartments, and buildings with corridors or shafts.

These changes mean:

• Many popular HVAC systems are now non-compliant
• Room layouts may need adjustment due to refrigerant piping limitations
• Ventilation systems might require upgrades
• Permitting and inspection delays if you don’t plan now

 

Effective January 1, 2025, refrigerants with a Global Warming Potential (GWP) >700 will be prohibited for new equipment. This transition introduces new layout, ventilation, and code requirements for buildings using A2L refrigerants.¹

🚨 Some A2L-compliant equipment is still limited in availability.
 

A short consult with our MEP and code experts could save you months of redesign.

 

Don’t Wait Until You’re Red-Lined

Code changes like this aren’t just about compliance—they’re about risk. Failing to address these refrigerant updates now could mean:

• Redesigning HVAC layouts mid-permitting

• Material or equipment shortages

• Failed inspections due to flammability code issues

BASE4 – Your MEP Experts

We help developers adapt HVAC layouts and mechanical strategies early. Our in-house MEP and code compliance experts are ready to help.

 

 

 

 

Thank you,

Blair Hildahl
BASE4 Principal
608.304.5228
BlairH@base-4.com

Source:

1.2025 update via BuildingCode.Blog
https://www.buildingcode.blog/blog/a2l-refrigerants-a-code-requirement-overview