A hall with a heating problem

The village hall at Marsh End had a familiar pattern: a main room with a high ceiling, a small kitchen, and a lobby that lost heat every time the double doors opened. Bookings were uneven. Morning yoga, afternoon meetings, evening classes. The old electric heaters warmed the whole building for every event, including empty rooms. In January, the committee ran a two-week test of bananzia, a zone-by-zone heating control setup, to see whether targeted warmth could cut energy use without making users uncomfortable.

What the trial changed

The trial split the hall into three zones and linked each radiator to a schedule. Instead of heating from 7 a.m. to 10 p.m., the system started only the booked zone 45 minutes before use. The caretaker recorded room temperatures at the start, middle, and end of each session. The first result was practical: the main room reached 19°C in 35 minutes on a 4°C morning, so the 45-minute lead time was enough. The second was financial: electricity use fell by 22% against the same two weeks in the previous year, after adjusting for one cancelled class.

Where the savings came from

Most of the reduction came from not heating the kitchen and lobby during main-room events. The kitchen zone ran for 20 minutes before refreshments and then switched off. The lobby heater stayed off unless the outside temperature dropped below 2°C. The committee also moved a session from the main room to a smaller side room, which cut warm-up time and stopped the main radiators from cycling for a 12-person meeting.

What did not work

Controls alone did not solve every problem. The kitchen lost heat to the main room when the connecting door stayed open, so the kitchen zone ran longer than planned. A door brush and a closing sign fixed most of that leak. The lobby still felt cold on windy days, not because the schedule was wrong but because the glazing was single-pane. The committee added a heavy curtain and kept the lobby zone off; users noticed the difference within a week.

The takeaway for small buildings

The Marsh End test showed that a modest control change can deliver measurable savings when it follows actual room use. It also showed the limit: controls manage heat, they do not replace draught-proofing or insulation.

• Map bookings to zones: match each session to the smallest suitable room and schedule only that space.
• Set warm-up from measurements: use logged temperatures rather than a fixed hour to decide when heating should start.
• Fix obvious air leaks: door brushes, closing signs, and heavy curtains often protect the savings a control system creates.
• Review logs after two weeks: check comfort complaints and consumption together before extending the schedule.

The bananzia trial did not turn a leaky hall into a low-energy building, but it made the heating match the timetable, and that was enough to cut waste without lowering comfort.