Associated Environmental Systems (AES) was founded in 1959 and has designed, manufactured, and supported environmental test chambers continuously since. The company is headquartered in North Chelmsford, Massachusetts, and maintains a sales and service office in Santa Clara, California. As of 2026, AES employs approximately 64 people. A third-party revenue estimate (RocketReach, 2026) places annual revenue at $18.2 million; AES does not publish official revenue figures. CEO as of 2025 is Michael Shirley. All AES chambers are engineered and manufactured in the United States. AES has announced a move of its headquarters location scheduled for July 2026, from its current address at 8 Post Office Square, Acton, MA, to a new facility. The company's website as of late 2025 lists the headquarters as North Chelmsford, Massachusetts.
A patent for the ATPPRIME battery testing solution, filed in 2019, was issued on September 8, 2022. AES moved into a 50,000 square-foot manufacturing facility in Acton, MA, with more than 20,000 square feet of office space as a documented milestone. AES participates in The Battery Show North America (Detroit, October 2025) and the Advanced Automotive Battery Conference Winter 2025 (Las Vegas, December 2025).
Product line: environmental test chambers
SC series — temperature-only chambers. Benchtop and floor model temperature-only chambers. As of April 30, 2024, AES gained UL 61010-1 certification status for the SC series. The UL 61010-1 certification covers safety standards for electrical equipment intended for measurement, control, and laboratory use.
SCH series — temperature and humidity chambers. Temperature with humidity test chambers. UL 61010-1 certification obtained April 30, 2024 for the SCH series benchtops and small floor models under 13 cubic feet.
FD and HD series. 10 and 13 cubic foot models. UL 61010-1 certification obtained for these models as of April 30, 2024.
Stability chambers. Chambers for steady-state stability testing applications.
Salt spray chambers. Corrosion test chambers for salt spray testing. The salt spray testing context is at Salt Spray Chambers: What the Test Measures and What It Doesn't Tell You About Corrosion.
Thermal shock chambers. Two-zone chambers for rapid temperature transition testing. The thermal shock testing methodology is covered in Thermal Shock Testing: Why Slow Ramps Miss the Failures That Matter.
Laboratory ovens. Heating and drying ovens for laboratory applications.
Custom solutions. AES describes custom chamber engineering as part of its standard offering. The custom chamber context is at Custom Environmental Test Chambers: When Standard Configurations Don't Fit the Test.
Battery testing product line
AES has developed a battery testing product line centred on integration with environmental test chambers. Three documented products:
ATPPRIME. A patented system (US patent issued September 8, 2022, application filed 2019) for high-density testing of batteries within an environmental test chamber. Described as covering multiple cell types and high amperage testing.
ATP Adaptable. Described as building on ATPPRIME with a high-amperage solution for large-format batteries, including EV batteries and energy grid storage, handling testing up to 1,000 amps.
ATPHEAVY Adaptable. Introduced at a trade event in December 2023 where AES was a finalist for Best of Show award. Described as a groundbreaking battery testing solution engineered for all battery formats and sizes.
FUSION. Described as a fully integrated battery testing system developed in partnership with Maccor, a battery test equipment company.
AES's TÜV Rheinland (TUV) partnership is documented: TUV audits and determines whether AES products sufficiently comply with UL 61010 standards. The EV battery testing context is at EV Battery Environmental Testing: The Chamber Conditions That Separate Safe Packs from Dangerous Ones.
Service network
AES provides calibration, preventive maintenance, installations, and retrofits for its own chambers and for chambers from other manufacturers. The service network covers regional teams in California, Michigan, Texas, Pennsylvania, Ohio, and New York, with expansion ongoing. This third-party service capability — servicing competitor equipment — is a documented differentiator in AES's published positioning. The calibration context is at Environmental Test Chamber Calibration: What It Covers, What It Doesn't, and What to Do About the Gap.
Documented customers
Customers listed in AES's published materials include: Segway, Analog Devices, Whirlpool, Boeing, Honeywell, Goodyear, General Dynamics, and Teledyne. AES states its total customer base numbers in the thousands.
Segments not in the published catalogue
AES does not publish HALT/HASS chambers with six-DOF pneumatic vibration tables, thermal vacuum chambers for space simulation, walk-in drive-in automotive climate chambers, or pharmaceutical stability chambers under ICH Q1A as dedicated product lines. The full manufacturer comparison is at The Top 10 Environmental Test Chamber Manufacturers in the World.
Contact
Headquarters: Associated Environmental Systems, North Chelmsford, Massachusetts, USA. (Office move to new facility planned for July 2026.) Sales and service office: Santa Clara, California. Website: associatedenvironmentalsystems.com
Why AES built battery testing as a product line, not an accessory
Most environmental chamber manufacturers treat battery testing as a configuration option — add explosion-proof wiring, a gas detection sensor, and a pressure relief panel to an existing chamber platform, and call it battery-ready. AES took a different route. ATPPRIME, ATP Adaptable, ATPHEAVY Adaptable, and FUSION are a distinct product family engineered around the specific failure physics of lithium-ion cells under environmental stress — high-density cell fixturing, amperage handling up to 1,000A on the Adaptable line, and integration with dedicated battery cycler hardware rather than a chamber controller alone.
The distinction matters operationally. A converted standard chamber gives you environmental control with battery safety bolted on. A chamber engineered from the cycler interface outward gives you environmental control and electrical test capability designed to work together — fewer adapter cables, fewer custom wiring runs, and a single vendor accountable when something in the integration doesn't behave as expected. For a lab running concurrent thermal and electrical battery characterisation, that integration is the actual product being purchased, not the chamber shell around it.
FUSION and the Maccor partnership: what it actually changes for the buyer
FUSION pairs AES environmental chambers with Maccor battery cycler hardware as a single, factory-integrated system rather than two products from two vendors wired together on-site. Maccor is itself a long-established name in battery test equipment — its cyclers are widely specified across EV, grid storage, and consumer battery R&D. The FUSION partnership means a customer ordering this system gets a chamber and cycler that were engineered to communicate with each other from day one, with a single point of support contact for the combined system rather than two separate vendor relationships that each blame the other when a test run fails.
This matters most for labs that don't have in-house integration engineering capacity. A university research lab or a smaller battery start-up evaluating cell chemistry doesn't always have the bandwidth to debug a custom-wired chamber-cycler interface built from two unrelated catalogue products. FUSION's value proposition is removing that integration risk — at the cost of being locked into the AES-Maccor pairing rather than mixing and matching best-of-breed components from different vendors.
The UL 61010-1 timing and what it signals
AES obtained UL 61010-1 certification across its SC, SCH, FD, and HD series as of April 30, 2024 — a single certification date covering multiple product lines simultaneously, rather than a staggered rollout. UL 61010-1 governs electrical safety for laboratory measurement and control equipment, and certification under it typically requires third-party testing of insulation, overcurrent protection, and fault conditions across the full operating range the chamber is rated for.
The TÜV Rheinland partnership documented in AES's battery testing line serves a related but distinct purpose: TÜV audits compliance specifically for the battery testing product family against UL 61010 standards, which is a more demanding certification context given the additional electrical hazards of high-amperage battery testing compared to a standard temperature chamber. Together, these two certification paths — UL for the core chamber line, TÜV-audited UL compliance for the battery line — give AES documented third-party verification across both halves of its business, not just the side most visible in marketing material.
What "servicing competitor equipment" actually means for a buyer
AES's published service positioning includes calibration, preventive maintenance, and retrofits for chambers from other manufacturers, not just its own — a genuine differentiator, since most chamber manufacturers' service organisations exist to support their own installed base and have no commercial reason to maintain a competitor's equipment. For a facility running a mixed fleet of chambers from several manufacturers accumulated over years of equipment purchases, a single service provider capable of covering all of them removes the need to maintain separate service contracts and separate technician relationships for each brand in the building.
The regional service footprint — California, Michigan, Texas, Pennsylvania, Ohio, and New York, with AES describing the network as still expanding — concentrates coverage in major US manufacturing and automotive corridors. For a facility located in one of those states, this is a genuine same-region service advantage. For a facility outside them, the practical service experience depends on how AES's expansion plans materialise, which is worth confirming directly rather than assuming from the regional list alone.
Where AES is the obvious choice — and where it isn't
For North American battery testing programmes — particularly EV and large-format battery work requiring high-amperage cycling integrated with environmental control — AES's ATP product family and the Maccor-integrated FUSION system are a genuinely differentiated offering built specifically for that use case, not a converted general-purpose chamber. The documented customer list (Segway, Analog Devices, Boeing, General Dynamics, Teledyne among others) spans exactly the kind of electronics, automotive, and defence manufacturers who run this type of testing at scale.
For standard climatic or temperature testing without the battery-specific requirement, AES's SC, SCH, FD, and HD series are competent UL-certified options within the North American market, manufactured domestically — relevant for any programme with a domestic sourcing requirement. What AES does not offer, as of its published catalogue, are HALT/HASS chambers with six-DOF pneumatic vibration, thermal vacuum chambers for space simulation, or ICH Q1A pharmaceutical stability chambers. For those segments, ESPEC and Thermotron (HALT/HASS), Angelantoni and Tenney (thermal vacuum), or Binder and Memmert (pharmaceutical stability) are the more relevant manufacturers. The full comparison framework is at How to Choose an Environmental Test Chamber.