Does CryogenX4 Work? What the Company Claims, What Research Shows, and How to Test It

Key takeaways

• CryogenX4 reports savings of up to 30% and typical payback of 12 to 36 months; results vary by equipment condition.
• A treatment can only recover the loss that is there: clean systems have little oil film to remove.
• Independent tests of similar oil additives, including LBNL's 2006 chiller field test, found little or no measurable effect.
• Category research neither proves nor disproves one product; it raises the bar for evidence.
• The deciding evidence is a measured pilot on your own units, with the success test written before installation.

If you searched for whether CryogenX4 works, you deserve a straight answer from the company's own site, not a sales pitch. Here it is. CryogenX4 reports energy savings of up to 30% on equipment where oil has fouled the heat-exchanger surfaces. Independent research on the broader family of polarized oil additives is mixed, and the best-known field test found no measurable effect. Neither fact settles the question for your equipment. The only result that does is a measured one, on your own units, under a plan agreed before anything is installed. This page explains all three parts: what the company claims, what the outside research found, and how to test the claim yourself.

What CryogenX4 says the treatment does

According to the company, CRYOGENX4 is a one-time treatment injected into existing HVAC-R systems while they run. The company's description of the mechanism is this: compressor oil migrates past seals, circulates with the refrigerant and coats the inside of the coils, where it forms an insulating film. CRYOGENX4's polarized molecules are said to lift that oil, return it to the compressor sump and condition the metal surfaces for better heat transfer. The company also says the treatment improves the lubricity of the existing oil, reducing friction and compressor heat.

The company's stated results and scale:

• Savings: energy savings "up to 30%," with typical payback on the treatment of 12 to 36 months. Results vary by equipment condition, and savings are not guaranteed.
• Installation: one application, installed by trained, certified technicians while the system runs, with no downtime and no modifications to the system. Most installs take one day. The company says the treatment is intended to last for the remaining life of the equipment.
• Scale: the company reports more than 50,000 units and 500,000 tons treated, covering more than 10.5 million square feet, on equipment from 1-ton air-cooled split units to 1,600-ton water-cooled chillers.
• Testing: the company states that Intertek tested and certified compatibility with all refrigerants and refrigerant oils, that the technology was tested under AHRI, ASHRAE, ASTM, API, ANSI and EPA standards, and that a first-generation Tri-S product was tested under the DOE Federal Energy Management Program.

Note the words "up to." A ceiling is not an average. It tells you what the company has seen in favorable cases, not what a given unit will do. The rest of this page is about closing that gap with evidence. The company's own explanation is on how it works and its testing summary on laboratory and industry testing.

What "works" should mean

"Does it work" hides three separate questions. Keep them apart, because each needs different evidence.

For a facility manager, "works" should mean the third row: less electricity per ton of cooling delivered, under comparable conditions, by more than the measurement error. Lower kW on its own is not enough, because a unit that delivers less cooling also draws less power. Our guide to kW per ton, EER and COP explains the metrics.

Why the answer depends on your equipment's condition

Any treatment that removes a loss can only recover the loss that is there. If oil film on the coils is costing a system a meaningful share of its heat transfer, removing it has room to help. If the coils are already clean inside, there is little to recover, and a well-run test should show close to nothing. That is not a failure of measurement. It is the expected result.

The same logic applies to the other causes of lost efficiency. A treatment aimed at internal oil film will not fix a dirty outdoor coil, a low refrigerant charge, a slipping belt or a stuck economizer. If those faults are present, they can hide any effect or be mistaken for one. See diagnosing efficiency loss for how to tell the causes apart, and what oil fouling is for the mechanism itself.

This is why the company says results vary by equipment condition, and why a vendor result from another site, however good, tells you little about yours.

What independent research found about the category

CryogenX4 describes its chemistry as polarized molecules that lift oil off metal surfaces. That places it in the same broad family of claims as the polarized refrigerant oil additives (PROAs) that researchers have tested since the 1990s. The studies below tested other products, not CryogenX4, but they are the most relevant independent work, and you should know them.

LBNL field test on a 1,000-ton chiller (2005 test, published 2006)

Lawrence Berkeley National Laboratory designed a test for the U.S. Postal Service on a 1,000-ton water-cooled centrifugal chiller with a variable-speed drive, using R-134a, at a facility in Coppell, Texas. The baseline ran from July 1 to September 14, 2005; the additive went in on September 15; measurements continued to December 7. The team followed ASHRAE Guideline 14, logged chiller power, water temperatures and flows at one-minute intervals, and modeled chiller power against load and water temperatures. The result was savings of −2.02 kW ± 10.93 kW at 90% confidence, within model error. The authors concluded that "no effect could be measured."

The paper is careful about its limits, and so should we be. The authors said they "could not fully account for all possible factors," including seasonal load differences and unscheduled maintenance, and that other combinations of lubricant and additive would need their own full-scale tests. The paper did not report any measurement of oil film on the chiller's heat-exchange surfaces before the test, so it cannot tell us how much fouling there was to remove. It is still a model of how to test honestly: a long baseline, a regression model, and a result stated with its uncertainty whichever way it fell.

Copeland's technical information on oil additives

Copeland, a major compressor manufacturer, says it has tested several oil additive products and "has not been able to detect any meaningful change in compressor power consumption" on laboratory calorimeters at constant evaporating and condensing conditions. Copeland notes that claimed savings are often larger than the energy its bearings consume. It also notes, fairly, that those tests would not capture changes from an additive altering heat transfer in the system's heat exchangers, which "theoretically could occur in some systems." Its general recommendation is against "the use of any additives to reduce compressor bearing losses or for any other purpose," and it warns that untested additives may cause component failures and, in specific cases, void the component warranty. See OEM warranties and additives.

NIST laboratory work (2004 and 2007)

Mark Kedzierski at the National Institute of Standards and Technology tested one additive's effect on boiling heat transfer for the General Services Administration. With R-134a and a polyolester (POE) oil, the additive raised the heat flux by about 73% on average and up to 95% across the range tested. With R-123 and a mineral oil, it had essentially no effect over a similar range and degraded heat transfer by up to about 27% at a higher heat flux. The same additive helped in one combination and hurt in another. As LBNL quoted Kedzierski, "heat transfer improvements do not necessarily guarantee improvements in and/or changes in chiller performance."

For the wider record, including earlier studies and leak sealants, see do refrigerant additives work.

What category results do and do not prove

Category research cuts both ways. It does not prove that CryogenX4 fails, because the products, chemistry and equipment differ, and none of these studies tested it. It also does not prove that CryogenX4 works, and it rightly raises the bar. When credible tests of similar claims found little or no effect, a buyer is entitled to ask any vendor in this space, including us, for stronger evidence than an "up to" figure. We think that is a fair standard.

Evidence to ask any vendor for

1. A clear product description and Safety Data Sheet, including confirmation that the product contains no sealant chemistry.
2. Compatibility reports relevant to your equipment. The report should name the lab, the method, and the refrigerant and oil tested. Match them to your refrigerant and oil type (mineral, alkylbenzene, POE or PVE). See laboratory testing standards for what each test can prove.
3. Field results measured under a recognized protocol, such as IPMVP or ASHRAE Guideline 14, with the baseline period, normalization method, uncertainty and raw data available for review. Ask for results on equipment like yours: the same type, size range and refrigerant.
4. Oil analysis before and after treatment (acid number, moisture, wear metals), as LBNL ran in its test.
5. The installation record: technician certification, quantity, access point and readings before and after.
6. Agreement to measure on your units, under a plan written before installation, with a stated result that would count as "no effect."

The full checklist is in questions to ask efficiency vendors.

How to test it yourself

A small pilot on one to three units gives you an answer that no study or brochure can. The steps are covered in our pilot program guide. Four decisions make the difference between a result you can trust and one you cannot:

• Pick units that could plausibly benefit. Choose older units with a documented decline, after fixing coils, charge and airflow. Also pick a similar untreated unit as a comparison if you can.
• Write the success test first. Before installation, state the metric (kW per ton or kWh at matched conditions), the analysis method, and the smallest effect the measurement can detect. FEMP's M&V Guidelines note that every measured saving carries uncertainty from instruments, sampling and modeling. If the expected effect is smaller than that uncertainty, extend or redesign the test.
• Cover the same conditions before and after. The baseline should span the range of loads and weather the post-treatment period will see. Otherwise the comparison is extrapolation.
• Agree how to read every outcome. Savings clearly larger than the uncertainty mean the treatment worked on those units. Savings within the uncertainty mean no measurable effect, the same conclusion LBNL reached. A loss means something needs investigating.

To see what the final report should look like, use our sample pilot M&V report template. For the measurement points, see what a CryogenX4 pilot measures.

Our position

We would rather you measure than take our word for it. The company's claims are stated above, along with the research that challenges claims like them. Results vary by equipment condition, and savings are not guaranteed. If your equipment has the kind of oil fouling the treatment is designed to address, a measured pilot will show it. If it does not, the same pilot will tell you that too, before you spend money on a wider rollout.

Next step

List two or three candidate units with their type, tonnage, refrigerant, age and any record of rising kW or run time. Then request a pilot and ask for a draft M&V plan, including the "no effect" criterion, as the first deliverable.

Frequently asked questions

Has CryogenX4 been tested by independent researchers?

The company states that Intertek tested and certified compatibility with all refrigerants and refrigerant oils, that its technology was tested under AHRI, ASHRAE, ASTM, API, ANSI and EPA standards, and that a first-generation Tri-S product was tested under the DOE Federal Energy Management Program. Ask for the reports that match your refrigerant, oil and equipment type, and check which question each one answers: compatibility or savings.

Why did the LBNL study find no savings?

The authors linked the result to NIST's finding that this type of additive helps heat transfer only under specific conditions, such as an additive more viscous than the oil. They also noted factors they could not fully control. The study tested a different product on one chiller, so it does not predict results for other products or more heavily fouled equipment.

Will an oil-fouling treatment help a brand-new system?

Probably very little. New equipment has had little time to build up oil film inside the coils, so there is little to recover. Older units with long run hours and an unexplained decline in efficiency are better pilot candidates.

What result would show the treatment did not work?

Savings that are not clearly larger than the measurement uncertainty, under matched conditions, mean no measurable effect on those units. Write that criterion into the M&V plan before installation so both sides agree on it in advance.

Does using an additive void my equipment warranty?

It can. Copeland, for example, says untested additives may void the component warranty in specific cases. Check your OEM warranty terms and ask the vendor in writing how it handles warranty questions before treating equipment that is still under warranty.

Sources

1. De-Scaling the Peak: The Impact of a Polarized Refrigerant Oil Additive on Chiller Performance at a U.S. Postal Service Processing & Distribution Center (2006 ACEEE Summer Study) — Lawrence Berkeley National Laboratory / ACEEE
2. Technical Information TI_Oil_01: Oil Additives, General Recommendations — Copeland Application Engineering Europe
3. Effect of Refrigerant Oil Additive on R134a and R123 Boiling Heat Transfer Performance and Related Issues for GSA (NISTIR 7132, June 2004) — National Institute of Standards and Technology
4. Effect of Refrigerant Oil Additive on R134a and R123 Boiling Heat Transfer Performance (International Journal of Refrigeration, 2007) — National Institute of Standards and Technology
5. M&V Guidelines: Measurement and Verification for Performance-Based Contracts, Version 5.0 (September 2024) — U.S. Department of Energy, Federal Energy Management Program
6. International Performance Measurement and Verification Protocol (IPMVP) — Efficiency Valuation Organization (EVO)