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Our LH and LHE-1.5 models are laboratory benchtop environmental test chambers. These chambers can serve a two-fold purpose, with the ability to perform stability tests for extended periods at multiple temperatures and humidity setpoints.  Additionally, the chambers can be used for cycling tests, achieving tight uniformity during various soak times at different temperature and humidity setpoints. Cycling is best achieved by upgrading to an optional PID controller.  

The LH and LHE-1.5 models have a working volume of 1.369 cubic feet (38.765 liters), and external dimensions of 27.5"W x 31"D x 34"H (700W x 785D x 865H mm), with two low to high-temperature range configurations as shown below; a tightly controlled humidity range of 10% to 98% relative humidity. 

The LH Series has been UL/CSA 61010-1 certified by TUV Rheinland

LH/LHE Temperature and Humidity Configurations:

    • LH-1.5 - Temperature and humidity capability 5°C to +94°C (41°F to +201°F)
    • LHE-1.5 - Temperature and humidity capability -20°C to +94°C (-4°F to +201°F)


LH-1.5 - $1,500/month

*3 month minimum rental

LH-1.5 Price


Interior: 14"x 13"D x 13"H
  355W x 330D x 330H mm
Exterior: 27.5"W x 31"D x 34"H
  700W x 785D x 865H mm
Volume: 1.369 cubic ft
  38.765 Liters
Temperature: LH 5°C to 94°C (41°F to 201°F)
  LHE -20°C to 94°C (-4°F to 201°F)
Humidity: 10% to 98%
Electrical Supply:  110 or 230V, 1 Phase, 60 Hz,12 FLA 
Full Load Amps: LH - 15 Amps 
  LHE - 20 Amps
Power Requirement:

NEMA 5-15

Chamber Plug Types


NEMA 5-20

*Rise and Pull-down rates calculated using IEC 60068-3-5 standard. Custom options available



Standard  2 Independently controlled Watlow EZ-ZONE PM controllers for manual setting temperature and humidity



Dashboard view enables chamber control at the chamber, at a desktop, or remotely via laptop or tablet

Profile Builder has drag-and-drop, web-browser functionality

Data Logging with onboard, multi-year logging of live and current data, anyplace anytime

Communication and Control uses standard, well-documented JSON API for easy integration with other test platforms

Security decreases test interference with three authentication methods and six permission levels 

View all the benefits of AES|XCHANGE

Watlow F4T Programmable Controller

Features a 4.3” capacitive touchscreen minimizing the chance for error. Ethernet communication supported by AES|XCHANGE

View more controller options


100 OHM Platinum RTD  is a highly-accurate sensor made from platinum components for increased sensitivity

View sensor options

Data Loggers

View additional data loggers


Safety Measures

We offer multiple types of safeties on our test chambers to help protect your product and your test chamber if anything malfunctions.

High Temperature Safety: (Standard)

A factory set high temperature safety prevents the chamber from exceeding safe operating conditions by disconnecting the heating circuit when an over temperature event occurs.

High/Low Temperature Safety:

A digital set temperature safety that will shut down the test chamber if it goes over a certain temperature or below a certain temperature.


Optional Features:

  • Shelf Modification (placement, size, number)
  • Dry Nitrogen Purge
  • Custom Porting Sizes
  • Window in Door and Internal Vapor Proof Light with External Switch
  • Water Demineralizer Cartridge System
  • Self Contained Water Recirculating System
  • Extended Temp. Range to -20°C
  • Desiccant Air Dryer (for lower RH Range)
Environmental Test Temperature and Humidity Chamber in Space Saving Design

Stability Stacked

Optimize the use of your available lab space. Go verticle with AES chambers stacked. With virtually the same footprint as one test chamber, you can have two chambers operating independently. 

Learn More

ramp rate performance by associated environmental systems


Customers require the ability to reliably test as much product as possible in as little time as possible. AES standard cascade refrigeration systems have the fastest standard change rates of any environmental test chamber manufacturer, with average pull down times of 2.5°C/ minute and average ramp rates of 4.4°C/ minute. AES chambers allow you to maximize product testing efficiency without sacrificing quality.

worker mike constructing chamber


All test chambers incorporate non-magnetic welded type 304 stainless steel inner chambers, a cold-rolled steel, powder coated exterior, efficient low "K" factor thermal insulation and direct drive-shaft powered forced air circulation along with open wire nichrome resistance elements generating ultimate functionality while maintaining a pleasant laboratory appearance. State-of-the-art regulation techniques result in high accuracy and long term stability.

Heating System electric by associated environmental systems

Heating System

AES heating systems are all-electric and pass air over fast-response low watt density resistance heaters with a ceramic core insuring a long reliable life with no down time. The combination of airflow, instrument response and these fast reacting heaters give very accurate and straight-line control of temperatures. Our heating systems support temperatures upwards of 180°C (356°F) and heaters may be controlled independently or in unison. Heating systems are located in a plenum so that test items are not subject to direct radiation.

cascade compressor

Cooling System

AES test chambers are either built with a single stage, self-contained mechanical refrigeration system [-37°C (-35°F)], or a two-stage, cascade mechanical refrigeration system [-65°C (-85°F)]. Depending on the size of the cooling system needed, more than one compressor will be included, or a small scroll compressor will be used to save space. Both refrigeration systems also come with an option for water cooling.


Liquid vs Air Cooled Test Chamber

Air cooling will heat up the room that the test chamber is located in, is usually less power efficient, slows the pull down times of the chamber, and needs more space, but costs less and is simpler.

The water cooling option does not heat up the room it is located in, is more power efficient, and has a smaller area compared to the air cooled option, but is more complicated, costs more, and needs a water supply.

Steam generator system by associated environmental systems

Humidity System

We use a vapor generator system to control the humidity within our test chambers. The vapor generator is a closed steam generator that can be sized to fit any chamber which offers quicker steam generation, but also can result in built up sediment. The humidity range on most test chambers is 20% to 98% +/-2% RH (Relative Humidity). The range can be lowered to roughly 5% RH with the use of a dry air purge.


Continual Humidity Package

Available for any test chamber with a humidity system, the continual humidity package allows users to recycle water used for humidity testing, eliminating the need for hard-plumbed water access and expanding the capability of autonomous testing.

  • Tower Level Control
  • 6 or 10 External Gallon Storage Tank
  • Recirculation Pump
  • Optional: Demineralizer Cartridge
  • Optional: Desiccant Dehumidifier
  • Optional: Chilled Mirror Humidity Sensor
dehumidifier work

Dry Air Purge/Dry Nitrogen Purge

The dry air purge features a desiccant dehumidifier which pulls moisture from the air using an active desiccant material, a hygroscopic substance that induces dryness in its vicinity. As the ultra dry nitrogen, which has a dewpoint of -70 degrees, is introduced into the enclosed cavity, it expands and places the test item under pressure, removing any residual moisture from the test product and internal test chamber environment.



Desiccant dehumidifiers have a more complex principle of operation but perform exceptionally well in colder climates or when there is a large amount of moisture in the air.

Temperature/Humidity environmental test chambers are commonly paired with dry air purge systems which reduces the humidity index of the chamber interior at a much quicker rate than a natural rate.

Temperature only chambers may also benefit from a dry air purge system if the user wishes to control the residual moisture that is generated with temperature changes within the chamber interior.
Dry nitrogen may also be used as a dry gas purge method.

silver nitrogen tank

Liquid LN2 or COBoost

Via an endothermic process, directly injected liquid carbon dioxide instantly drops the temperature of the test chamber interior, ideal for stress tests and efficient thermal dissipation. CO2 can lower the chamber's internal temperature almost instantaneously to -73°C (-100°F). Liquid CO2 is available to customers in either a bulk system stand-alone tank, or a cylindrical system which stores much smaller amounts in multiple attached vessels.

Liquid nitrogen is directly injected into the test chamber to both expand achievable temperature ranges and raise the temperature change rate. Upon contact with the air inside the test chamber, following the same thermodynamic principle as the CO2 boost, liquid nitrogen can rapidly decrease the interior chamber temperature. Liquid N2 boost can quickly lower the temperature to a cryogenic temperature of -185°C (-300°F).



LN2 Boost Extras Package

Unlike CO2 which has a boiling point of -57°C (-70.6°F), liquid nitrogen has a boiling point of -196°C (-320.8°F), therefore have pull-down rates that are much faster.

LN2 or CO2 cooling option for the FDP-4246 should only be considered in bulk form.  Cylinder option for the sizable workspace is not ideal.


CO2 Boost Extra Package

CO2 Scrubber Cartridge

A dependable filtering system designed to eliminate contamination caused by moisture, oil and dirt in bulk or bottled liquid CO2 supplies. Suitable for both 1000 psi and 300 psi service and assure pure CO2 at valves and metering orifices, completely eliminating problems of clogging and erratic operation.

Manifold for 6 Cylinders (MLC-6)

Included with the cylinder based CO2 cooling system, the manifold system is designed to regulate and monitor the vaporized gas coming from cryogenic cylinders. This system may be used to test to the MLC-6 specification.

CO2 Tank to Test Chamber Hose (DAK-6)

Included with the bulk order CO2 cooling system, the tank to test chamber hose provides safe and effective delivery of liquid CO2 to the chamber interior. This system may be used to test to the DAK-6 specification.


Bulk System

  • -18°C (0°F) and 300 psi
  • This larger reserve system has a higher initial cost but then offers a much lower per pound CO2 cost to customers and is recommended for long duration testing or multi-chamber operation.

xchange splash dashboard by associated environmental systems

Control and Data Collection

Digital chart recorders allow users to escape the limitations of pen and paper data recorders and provide a way to instantly monitor and store valuable testing data.

We offer a variety of controller and data logging options to fit your needs

Learn More
chamber in doorway, 34 inch by associated environmental systems


This model CAN fit through a standard 34" wide doorway. Casters and floor stands may be applied to any test chamber series except walk-ins, on request, to optimize transportation.