My first TV commercial in 17 years! The ice hallway took a while to get right; whether the shader looks like ice or not is totally dependent on what is in the HDR environment map.
The heat pumps are all imaginary models based on existing rival brands without getting so specific that litigation would occur.
To streamline the effects, I convinced the production to stage the glass doors in the living room location itself. That meant that I only had to add reflections of the ice environment to the glass in order to tie the two shots together. Camera tracking and keying were handled by Emrys Plaisted.