Collective heating: season, temperature and the settings that drive the bill

Every autumn the same questions return: when do we switch on, at what temperature, and why do some flats never heat up?

Collective heating alone accounts for a large share of a building’s charges and nearly all of winter’s complaints. The questions never change: why is the heating not on yet, why is it 19°C in one flat and 24°C in another, and why is the bill rising after a mild winter?

The board does not run the boiler room, but it has several real levers, usually unused for want of knowing what to ask.

The heating season

Contrary to a widespread belief, there is no universal switch-on date. The heating season is generally set by the building rules or a meeting decision, and the plant is driven by outside temperature rather than the calendar.

Worth settling once and for all at a meeting: indicative dates, an outside-temperature threshold that triggers start-up, and the manager’s ability to bring it forward in an early cold snap. That is enough to end the debate for years.

The target temperature

Too high a setting is expensive and shows up immediately on the bill: every extra degree weighs heavily on annual consumption. Too low, and residents plug in electric heaters — the cost is displaced, not removed.

• Have actual temperatures measured in several flats, at different floors and orientations.
• Review the heating curve and controller settings with the operator.
• Check that night setback exists and works.
• Check that thermostatic valves are neither missing nor stuck.

These settings belong to the operating contract, not to works: obtaining them costs nothing and takes effect within the current season.

Flats that never warm up

Consistently cold flats while others overheat almost always signal a balancing fault: water is not reaching the furthest or highest points. It is a known technical problem, fixed by balancing the network, not by raising the overall setting.

The reflex is to log complaints with the flat, floor and date rather than handling them one by one. A ten-line table turns an isolated complaint into a documented intervention request: see how to keep an incident log.

The operating contract

The most profitable document to re-read, and one of the least read. Depending on its type it covers plant operation, maintenance, parts replacement, or even a consumption guarantee.

• What exactly does it cover: operation, minor maintenance, major parts, on-call?
• What response times are guaranteed on breakdown, and are they met?
• Is fuel included or billed separately?
• Is there any performance or consumption-sharing clause?
• Are the annual maintenance reports delivered, and what do they say?

The analysis is the same as for any recurring contract: see a cleaning specification and the management contract.

What durably changes the bill

Settings win a few percent. Real savings come from insulation, lagging the basement pipework, better control and, where relevant, replacing the heat source.

Such works start from a diagnosis: see the collective energy assessment, the steps of an energy renovation and individual heating cost allocation.

Before considering works, have the settings checked: it is the only saving that costs nothing and shows up the following month.

Follow the heating season with CoproHarmony

CoproHarmony centralises resident complaints, tracks the operator’s interventions and keeps maintenance reports from one season to the next. Create your free space.

When settings are no longer enough, the question becomes replacing the collective boiler. And hot water follows its own rules: see temperature and legionella.