The Building 440 is an insulated, refrigerated hangar. There is an office and instrumentation building, a cold-weather engine test cell, the refrigeration system, mechanical-draft cooling towers, and a steam-heating plant
The All-Weather Room is 42 feet (13 m) by 22 feet (7 m). It has a temperature range from −80 °F (−62 °C) to 170 °F (77 °C). Rainfall can be as high as 15 inches (380 mm) per hour and the wind can be as high as 60 knots (31 m/s). Snow can be made in the chamber.