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.
Impact report · 2026
M&M Carnot
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.
BALTIMORE, UNITED STATES
504k
Cumulative tonnes CO₂e avoided
since 2022 · GWP 20
since 2022 · GWP 20
504k
tonnes CO₂e
in 2026 · GWP 20
in 2026 · GWP 20
1t
TFA avoided
in 2026
in 2026
4th
consecutive year
ATMO Approved
ATMO Approved
01
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.
02
Primary metric
A year of avoided emissions, made visible.
GHG emissions M&M Carnot avoided over the lifetime of 2025'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.
68k
homes / year
powered for a year on the same footprint
118k
petrol cars off the road
for one year of driving emissions avoided
1.3B
miles not driven
distance equivalent never burned in a tank
03
Hidden pollutant
TFA: the forever chemical you haven't heard of.
Trifluoroacetic acid is an ultra-short-chain PFAS that leaks from synthetic refrigerants and accumulates in rainwater. Natural-refrigerant systems leak zero.
Stage 1 · Emission
HFCs and HFOs leak from refrigeration systems.
Synthetic refrigerants escape over the lifetime of every system — installation, service, end-of-life. The leaks are small, but they add up across millions of installations worldwide.
04
Growth
Cumulative avoided CO₂e emissions over the years.
M&M Carnot has been ATMO Approved since 2022 — 4 consecutive years of independently verified impact.
0
metric tons of CO₂e · GWP 20 years
2021
2022
2023
0
metric tons of CO₂e · GWP 100 years
2022
05
Voices from the field
What operators say after a year on natural refrigerants.
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.
06
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.
Work with M&M Carnot
Tell us about your project — we'll route the conversation to the right team.
Become ATMO Approved
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.