The ConExWall (eWHC) is specifically designed to be used in colder climatic zones, such as continental and alpine locations. The fundamental material for the frame is timber because of its low carbon footprint, high flexibility in shape, dimensions, and variety of connection techniques. It integrates a heating/cooling pipe network in its composition yielding a dynamic HVAC feature.

The advantage of this heating concept is the thermal activation of the whole existing façade which allows for using the existing wall as thermal storage. In the case of a heating system with a heat pump and PV, this enables running of the heat pump longer and to higher temperatures during times of excess electricity gains from the PV system, and on the other hand, to run it for shorter times during periods when electricity must be purchased from the electricity grid. Additionally, such an operational mode overcomes the shortage of energy delivered to a room, which is strongly dependent on the opaque external wall area. An integrated control system, by means of an advanced monitoring system, measures weather data, the supply temperature of the heating system, room temperature, and CO2 concentration and will control the thermal comfort as well as the IAQ.

The outer layers serve as load-bearing timber and include the main thermal insulation. Its purpose is to ensure the best and maximum contact of the heating/cooling pipes with the existing façade wall accounting for wall irregularities. This enables the element to adapt to uneven sections of the wall (Material: wood fibre, sheep wool, hemp wool, glass and rock wool).