Karl explained, "The residents are mainly high-dependency. This means they have low mobility, so they are very sedentary and need a higher degree of heat to keep warm. The heating is on a lot — it's on '24/7'. It was more of a challenge to keep costs down because the existing heating system only had simple, basic controls", he added, "Because it is a large and old building, heating is one of our biggest outlays along with wages. We wanted more control because the building is split into two areas".