M&M Carnot — Impact report 2024

Why this matters

Most refrigeration runs on chemicals that warm the planet — or quietly poison it.

HFCs warm the atmosphere up to 14,000× more than CO₂. Their HFO replacements break down into TFA — a forever chemical now detectable in rain, ice, and human blood.

The answer

CO₂, ammonia, hydrocarbons — proven for over a century. They don't warm the planet, and they don't leave a forever chemical behind.

Natural refrigerants avoid both.

Primary metric

A year of avoided emissions, made visible.

GHG emissions M&M Carnot avoided over the lifetime of 2023's equipment.

Stage 1 · Scale check

1 metric ton of CO₂e is an 8-meter cube.

A petrol car emits roughly that much in six months.

In real-world terms

What it adds up to.

132k

homes / year

powered for a year on the same footprint

233k

petrol cars off the road

for one year of driving emissions avoided

2.7B

miles not driven

distance equivalent never burned in a tank

Growth

Cumulative avoided CO₂e emissions over the years.

M&M Carnot has been ATMO Approved since 2021 — 3 consecutive years of independently verified impact.

metric tons of CO₂e · GWP 20 years

2021

2022

2023

metric tons of CO₂e · GWP 100 years

2022

Voices from the field

What operators say after a year on natural refrigerants.

Ryan Ritter

President

Enns Industrial Refrigeration

Performance

M&M Carnot Refrigeration delivered a system that met the specified performance requirements and has operated reliably since commissioning.

Ryan Ritter

President

Enns Industrial Refrigeration

Quality & Reliability

M&M Carnot Refrigeration’s system has been very reliable to date, with smooth operation and no breakdowns or recurring issues. Overall, we have been very satisfied with its performance and dependability.

Ryan Ritter

President

Enns Industrial Refrigeration

Safety

Yes. M&M Carnot Refrigeration supplied equipment that complied with applicable safety standards, including TSSA requirements. The documentation and equipment quality supported a safe and compliant installation.

Ryan Ritter

President

Enns Industrial Refrigeration

Service

M&M Carnot Refrigeration provided strong service and responsive technical support throughout the process. They met their delivery commitments and were helpful in addressing questions and support needs as they came up.

Ryan Ritter

President

Enns Industrial Refrigeration

Satisfaction

We would be very likely to work with M&M Carnot Refrigeration again based on the quality of the equipment supplied, reliable performance, and the level of service and support provided throughout the project.

Ryan Ritter

President

Enns Industrial Refrigeration

Training

Yes. M&M Carnot Refrigeration provided valuable training, including bringing our engineers into their office for hands on instruction. This helped our team build confidence in managing and operating CO2-based equipment

Clark Andrews

Director of Business Development

IR Pros

Performance

While the transcritical CO2 system has not been fully commissioned yet, the engineering/design process, build quality and delivery time met or exceeded our expectations.

Clark Andrews

Director of Business Development

IR Pros

Quality & Reliability

While the transcritical CO2 rack is not fully commissioned, we have not experienced any major issues to date.

Clark Andrews

Director of Business Development

IR Pros

Safety

Yes, the system was designed to meet all required safety requirements.

Clark Andrews

Director of Business Development

IR Pros

Service

While the transcritical CO2 system is not fully commissioned, the technical support received and delivery time commitment met or exceeded our expectations.

Clark Andrews

Director of Business Development

IR Pros

Satisfaction

We are highly likely to work with this company again. They are a leader in transcritical CO2 technology, deliver high quality equipment and have knowledgeable engineers and technicians.

Clark Andrews

Director of Business Development

IR Pros

Training

Yes, M&M Carnot provides several training classes per year for both engineers and technicians on their natural refrigerant-based equipment. We routinely participate in this training.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Performance

The product has been performing sufficiently. The start up process has been more complex and challenging than with traditional Cascade CO2 or Ammonia systems.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Quality & Reliability

Overall, the product has been reliable. We have experienced more equipment failures than traditional Cascade CO2 or Ammonia.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Safety

Yes, 100%

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Service

Technical support has been great, and deliveries have been on time with no issues.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Satisfaction

My experience working with M&M/ JCI has always been excellent and continues to be so. We continue to work this this group and expect our relationship to stay strong in the future.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Training

On-site training has been provided, and additional classroom-style Transcritical CO₂ training opportunities have been offered. It is up to our team to fully take advantage of these resources.

Ryan Ritter

President

Enns Industrial Refrigeration

Performance

M&M Carnot Refrigeration delivered a system that met the specified performance requirements and has operated reliably since commissioning.

Ryan Ritter

President

Enns Industrial Refrigeration

Quality & Reliability

M&M Carnot Refrigeration’s system has been very reliable to date, with smooth operation and no breakdowns or recurring issues. Overall, we have been very satisfied with its performance and dependability.

Ryan Ritter

President

Enns Industrial Refrigeration

Safety

Yes. M&M Carnot Refrigeration supplied equipment that complied with applicable safety standards, including TSSA requirements. The documentation and equipment quality supported a safe and compliant installation.

Ryan Ritter

President

Enns Industrial Refrigeration

Service

M&M Carnot Refrigeration provided strong service and responsive technical support throughout the process. They met their delivery commitments and were helpful in addressing questions and support needs as they came up.

Ryan Ritter

President

Enns Industrial Refrigeration

Satisfaction

We would be very likely to work with M&M Carnot Refrigeration again based on the quality of the equipment supplied, reliable performance, and the level of service and support provided throughout the project.

Ryan Ritter

President

Enns Industrial Refrigeration

Training

Yes. M&M Carnot Refrigeration provided valuable training, including bringing our engineers into their office for hands on instruction. This helped our team build confidence in managing and operating CO2-based equipment

Clark Andrews

Director of Business Development

IR Pros

Performance

While the transcritical CO2 system has not been fully commissioned yet, the engineering/design process, build quality and delivery time met or exceeded our expectations.

Clark Andrews

Director of Business Development

IR Pros

Quality & Reliability

While the transcritical CO2 rack is not fully commissioned, we have not experienced any major issues to date.

Clark Andrews

Director of Business Development

IR Pros

Safety

Yes, the system was designed to meet all required safety requirements.

Clark Andrews

Director of Business Development

IR Pros

Service

While the transcritical CO2 system is not fully commissioned, the technical support received and delivery time commitment met or exceeded our expectations.

Clark Andrews

Director of Business Development

IR Pros

Satisfaction

We are highly likely to work with this company again. They are a leader in transcritical CO2 technology, deliver high quality equipment and have knowledgeable engineers and technicians.

Clark Andrews

Director of Business Development

IR Pros

Training

Yes, M&M Carnot provides several training classes per year for both engineers and technicians on their natural refrigerant-based equipment. We routinely participate in this training.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Performance

The product has been performing sufficiently. The start up process has been more complex and challenging than with traditional Cascade CO2 or Ammonia systems.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Quality & Reliability

Overall, the product has been reliable. We have experienced more equipment failures than traditional Cascade CO2 or Ammonia.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Safety

Yes, 100%

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Service

Technical support has been great, and deliveries have been on time with no issues.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Satisfaction

My experience working with M&M/ JCI has always been excellent and continues to be so. We continue to work this this group and expect our relationship to stay strong in the future.

James Duffy

Sr. Manager Engineering, Transformation & Development

United States Cold Storage

Training

On-site training has been provided, and additional classroom-style Transcritical CO₂ training opportunities have been offered. It is up to our team to fully take advantage of these resources.

The company

M&M Carnot: company profile.

Their vision is to advance the development of natural refrigeration technologies across a wide range of industries, including industrial, recreational, commercial, and data center applications. Through this commitment, M&M Carnot aims to lead the transition toward systems that respect and preserve the environment.

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Does your company use natural refrigerants?

The ATMO Approved label is independently verified — not self-declared, not marketing. If your equipment runs on CO₂, ammonia, hydrocarbons, or water, you may qualify.

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