The HAMSTER project (2016-2022) aimed at designing, building, and validating a bi-climatic chamber. The test facility developed within the project, called the HAMSTER test facility, is a recent versatile bi-climatic chamber that is made to study the dynamic heat, air and moisture performance of building components of realistic size. The hot chamber is furthermore thoughtfully designed to conduct accurate stationary thermal transmittance tests according to the standards. Realistic climatic conditions, like rain, sun, and pressure differences, can be reproduced in the cold chamber so that many different tests can be performed using HAMSTER. After 6 years facing numerous challenges, this new testing facility has been installed at the Buildwise laboratory in Brussels, Belgium.