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IIAR Seeks to Streamline U.S. Safety Rules for Ammonia Refrigeration
A task force has begun discussion with EPA about eliminating regulatory overlap with OSHA and deferring to IIAR standards, among other changes.
NRDC Outlines Case Against Revision of EPA’s Technology Transitions Rule
The NGO is part of a consolidated lawsuit challenging delays in low-GWP-refrigerant requirements.
U.S. State Attorneys General Challenge EPA’s Revision of Technology Transitions Rule
Eighteen states and two localities follow trade groups in asking courts to reverse delays in lowering allowable GWP of refrigerants in commercial and industrial refrigeration.
Rivacold CO2 CDUs and R290 Monoblocs Enable Sustainable Retrofit at Vermont Food Co-op
The units, totalling 32.1TR of capacity, support a piecemeal solution for the space- constrained store, according to contractor Turner Piping.
ATMO America: St Paul Local 455 Replaced 27 Rooftop HVAC Units with Single CO2 Heat Pump
Commissioned in January, Flow’s ANSWR unit delivers 130°F water, operating solely in air-source mode, to heat the 100,000ft>sup>2 facility.
U.S. EPA Proposes Monitoring TFA in Drinking Water
TFA, an HFO byproduct, is among 30 chemicals under review; the agency is holding webinars on the topic on August 11 and 12, with written feedback due August 31.
Pennsylvania Food Processor Installing 185kW Vitalis CO2 Refrigeration Compressor Rack
The Roxsta G6 unit will blast-freeze steamed dumplings at an evaporating temperature of −42°C at the Bethlehem facility.
Industry Roundtable: CO2 Condensing Units Are Gaining Traction in North America
NaturalRefrigerants.com spoke with leaders at Danfoss, Heatcraft, Hillphoenix Kysor Warren Epta US and Zero Zone about the development of the CO2 CDU market in North America.
ATMO America: New York Environmental Agency Declares Support for Natural Refrigerants
Suzanne Hagell of the NYSDEC explains how natural refrigerant-based systems help the state achieve the HFC-reduction goals it established in its updated regulations.
Weekly Wrap-up: A Vitalis CO2 Heat Pump Cuts a University’s Emissions, Liquid Nitrogen in Transport Refrigeration, Swegon’s New R290 Heat Pump and More
In addition to what we published this week, these stories caught our eye.
ATMO America: IIAR Updating CO2 Safety Standard to Address High-Pressure Issues
New Addendum A helps to calculate minimum discharge capacity for relief valves; IIAR research committee is looking at pressure-discharge piping and low-side pressure.
AHRI and Other Trade Groups Challenge U.S. EPA’s Reconsideration of Technology Transitions Rule
The Alliance for Responsible Atmospheric Policy, HARDI, PHCC and ACCA also oppose extension of deadlines for commercial refrigeration applications to switch to lower-GWP refrigerants.
ATMO America: Alternative Cooling Start-Ups Seek Industry Partners to Commercialize Technology
Pascal, MIMiC Systems and Magnotherm are at different stage of development with systems that generate cooling and heating with solid materials rather than gases.
ATMO America: Americold Deploys Single-Stage Transcritical CO2 Refrigeration at New 542TR Canadian Warehouse
The design eliminates booster compressors and associated controls, reducing CAPEX by 18.2% while serving both LT and MT loads, according to TehnoRef4.
ATMO America: Zero Zone Supplying 91TR CO2 System for Nashville Grocery Fulfillment Center
The manufacturer analyzed the design for multiple low- and medium-temperature applications using Bitzer’s new Fender simulation tool.
ATMO America: M&M Carnot CO2 Chillers Cool 1.3MW Heat Load at Evocative’s California Data Center
The site’s PUE dropped from as high as 1.8 to generally below 1.5, while adding AI workloads, according to Evocative’s vice president.
ATMO America: M&M Carnot Outlines Advantages of CO2 for Data Center Cooling
Backed by more than 260 installations, the company expects CO2 deployments in the sector to roughly double each year through 2031.
ATMO America: Buc-ee’s Opens Its First Travel Center with CO2 Refrigeration in Ohio
Moving forward, the retailer plans to use CO2 as its refrigeration prototype, with six‒eight new sites expected yearly, according to the procurement director.
ATMO America: Experts Chart Path for Natural Refrigerants in HVAC
Êffecterra is developing a CO2 chiller/heat pump while DMG North offers training on a CO2 heat pump; Aris Hydronics is piloting R290 air-to-water heat pumps while UC Davis is researching advances in R290 air-to-water heat pumps.
ATMO America: Flow Environmental Systems CO2 Heat Pumps Help Major American Tech Company Decarbonize
The water-to-water units replace legacy gas boilers, upgrading heat recovered from data center cooling to deliver 180°F hydronic and domestic hot water.
ATMO America: Independent New York Grocers Embracing CO2 Refrigeration Ahead of State HFC Regulations
Despite a 15‒16% CO2 CAPEX premium, Uncle Giuseppe’s projects a six-year ROI through lower energy and refrigerant costs.
ALDI Tops the EIA’s 2026 U.S. Climate-Friendly Supermarket Scorecard
The assessment measures the efforts and progress supermarket chains have made to eliminate HFC refrigerants.
ATMO America: New York Grocer DeCicco’s Earns Over $66K by Selling Carbon Credits via Therm for CO2 Installations
Small New York-based food retail chain DeCicco’s & Sons earned US$66,668 (€62,262) by selling refrigeration carbon credits (RCCs) linked to replacing synthetic refrigeration systems in two stores with natural refrigerant…
ATMO America: ‘Our People Adapted Faster Than Expected’ to Working With CO2, Says Supermarket Chain Saker Shoprite
The New Jersey-based grocer’s VP of Technical Services said all of its new stores will be equipped with CO2 refrigeration systems.
Kysor Warren Epta U.S. to Have Five FTE Transcritical Installations
Five stores in the southern U.S. will use FTE technology to increase efficiency in warm climates.
ATMO America to Feature Funding Opportunities for Natural Refrigerant Installations
Supermarkets and other end users will be able to meet with several organizations that offer financial assistance next week in Tarrytown, New York.
Kroger Agrees to $100M Refrigeration Overhaul at 600 Stores to Settle Clean Air Act Violations
In addition, the retailer will pay a $2.5 million civil penalty for failing to promptly repair R22 refrigerant leaks.
Carly’s CEO and Technical Director Detail the Design of the TURBOIL-R-P 14 Oil Separator for Transcritical CO2 Refrigeration Systems
The TURBOIL-R-P 14 recently received UL certification and will soon be available in the United States.
NGOs Urge Consumers to Pressure Kroger to End Use of HFCs
Green America and EIA invite consumers to sign a letter to Kroger’s CEO urging him to phase out HFCs in all facilities by 2030.
Shareholder Challenges Kroger’s Continued Use of HFCs
Friends Fiduciary has filed a shareholder resolution asking the U.S. food retailer to transition from HFCs to ultra-low GWP and HFC-free refrigerants.
Kroger Faces Pressure from Stakeholders and Consumers to Act on HFCs
Over one third of Kroger’s shareholders have voted in favor of a resolution requiring the chain to issue a report on its plans to ‘address its HFCs.’
U.S. EPA Announces Final Revision of Technology Transitions Rule, Delaying Use of Low-GWP Refrigerants
The agency also proposes an exemption to leak repair requirements for transport refrigeration units.
Hillphoenix Continues to Enhance its CO2 Portfolio to Meet Growing Market Demand in North America
Over the last several years, the OEM has established a ‘platform portfolio’ of modularly designed products that can be built on high-speed assembly lines and cover the breadth of applications needed to support food retailers.
Boston Explores Heat Pumps for District Heating and Cooling Using Local Waterways
In 2025 members of the Boston Green Ribbon Commission visited the 30MW CO2 seawater heat pump system in Esbjerg, Denmark.
Cargill, IKEA and Saker ShopRite Are Among the End Users Presenting at ATMO America 2026
The two-day event will also include presentations and panel discussions featuring independent grocers, numerous manufacturers and policymakers.
Carly to Enter the U.S. Market After Receiving UL Certification for Its Transcritical CO2 Oil Separators
‘It was time for Carly to come to the U.S. because we’re coming with something different,’ said CEO Cyrille Berthet.
IIAR 2026: U.S. CO2 Sales Rising Alongside Industrial Demand for Larger Compressors
Danfoss and Dorin currently offer six-cylinder units, with both expecting to introduce eight-cylinder compressors around 2027.
Democrats Propose PFAS Legislation in U.S. Congress That Would Include F-Gases and TFA
McCollum in the House and Durbin in the Senate introduce bill that defines PFAS as having one fully fluorinated carbon atom, changing EPA’s definition.
Adoption of Transcritical CO2 in North America Increased by 28% in 2025
There were an estimated 6,360 North American supermarkets and industrial sites using R744.
New York Bills Attempt to Roll Back State HFC Rules to Align with the U.S. AIM Act
Claiming the HFC regulations drive higher costs, the bills follow a lawsuit by trade groups that would eliminate the regulations altogether.
IIAR 2026: Vitalis Details CO2 Revenue Growth, Projects and New Oil Management Vessels
The company doubled its revenue year-over-year ‘largely due to racks,’ according to Luke Redd, Head of Marketing.
IIAR 2026: CRS CEO Highlights CO2’s Growth in U.S. Industrial Refrigeration and Details New Projects
The projects include a 102TR system for an ice cream maker in Modesto, California, and a 372TR cold storage facility in Fort Worth, Texas.
New York Grocer DeCicco & Sons to Open Ninth CO2 Store and First R290 Store
On June 1 CEO John DeCicco Jr will host a tour of his Sleepy Hollow, New York, store’s CO2 and advanced heat reclaim system, which he will discuss the next day at ATMO America in nearby Tarrytown.
IIAR 2026: Hillphoenix Aims to Cut Lead Times and Costs for End Users With New Industrial CO2 Rack Platform
The AdvansorUltra covers ‘95% of the market from a feature standpoint,’ according to Ousama Sabra, Industrial Sales Manager East at Hillphoenix.
Supermarket Trade Group Seeks Support for Transition to Natural Refrigerants in New York
The National Supermarket Association, serving urban independent stores, posts position paper outlining obstacles to adoption of CO2 and R290 systems that would comply with ambitious state regulations.
NASRC Survey: Transcritical CO2 Will Dominate in New U.S. Retail Stores Through 2029
Transcritical CO2 was selected as the refrigeration system at 1,470 out of more than 2,000 new sites in survey of large chains.
IIAR 2026: CO2 Components Account for ‘Well Over’ 50% of the Henry Group’s Business at Its Illinois Factory
Approximately 90% of production is for domestic consumption, according to Jesse Meredith, Regional Sales at the Henry Group.
Study at Cargill Plant Finds Airflow Diffusers Shorten Product Cooling Time
Diffusers reduce ammonia-based cooling time of turkey rolls by two to three hours.
Superpollutant Action Initiative Is Launched to Target F-Gases and Other High-GWP Substances
Seven U.S. companies have pledged $100 million to the program, which includes cutting refrigerant emissions through supplier engagement.
IIAR 2026: Zero Zone Launches New Transcritical CO2 Condensing Unit
The Genesys CO2 Edge Compact has a capacity range of 3 to 12TR and can operate in ambient conditions from −20°F to 105°F.