Energy & ecology
Ceiling fan winter mode: how much it saves on heating, in numbers
Published on ·4 min read
Winter mode is the least known argument for a ceiling fan, and the most profitable. One button on the remote reverses the rotation, and the unit that cooled in July starts redistributing heat in January.
It is not a marketing gimmick, it is simple physics: warm air rises, it has to be brought back down. This article gives the numbers, room by room, to know what it means on a heating bill.
Stratification: the heat you pay for without feeling it
Warm air is less dense than cold air: it rises and gathers under the ceiling. In a room heated by a radiator the measurement is constant: 3 to 4 °C between 10 cm above the floor and 10 cm below the ceiling, more with a high ceiling or a stove. The thermostat at 1.5 m sees an intermediate value; your feet sit in the coldest layer.
Result: you raise the setpoint to get warm feet, and mostly heat the ceiling. Each extra degree of setpoint costs about 7 % of consumption. Stratification is an invisible tax on every heating bill, especially in living rooms over 2.5 m high.
What reverse rotation does, and why you feel nothing
In summer the blades push air down to create a breeze on the skin. In winter mode they turn the other way and draw air up towards the ceiling. That air is pushed out to the walls, slides down them to the floor and rises again in the middle: a slow loop that mixes the room's air with no direct jet on people.
At speed 1, air speed at occupant level stays below 0.2 m/s, imperceptible. What you do notice is a thermometer on the floor gaining 1.5 to 2 °C in half an hour, and cold feet disappearing. The room becomes even to within 0.5 °C from floor to ceiling.
The Boréal 107
Retractable blades · Ø 107 cm · LED ceiling light & silent fan
- ✓Retractable blades: invisible when off, nobody guesses it's a fan
- ✓Sleep with windows closed, 30 dB, quieter than a whisper
- ✓Integrated LED 2700K → 6000K, dimmable: replaces your ceiling light
The calculation: 1 to 2 °C less on the setpoint
Once the room is even, the comfort felt at a 19 °C setpoint matches that of a stratified room set to 20 or 21 °C. So you lower the thermostat by 1 to 2 °C without losing anything. With the 7 % per degree rule, that is 7 to 14 % less heating consumption for the room.
For a 25 m² living room heated electrically, whose share of the annual heating bill is around 400 to 600 euros, the saving sits between 30 and 80 euros per winter. For a house with several rooms equipped, 100 to 200 euros per season. Against that, a fan at speed 1 draws 5 to 10 W: five months at eight hours a day, under 5 euros of electricity.
- ·12 m² bedroom, 2.5 m ceiling: 1 °C less, 15 to 25 euros per winter
- ·25 m² living room, 2.5 m: 1 to 2 °C less, 30 to 80 euros per winter
- ·35 m² living space, 3 m ceiling or more: 2 °C less, 60 to 120 euros per winter
- ·Fan running cost: under 5 euros per season
The right settings and the rooms that benefit most
Winter mode is set once for the season: reverse rotation, speed 1, continuously or during heating hours. Faster is useless and creates a draught; slower does not mix. The rooms that benefit most are those with a high ceiling, a mezzanine, a stove, or a single radiator far from the sofa.
The Boréal 107 offers this mode from its remote, without climbing a ladder to flip a switch on the motor. Off, it remains a discreet LED ceiling light; in winter it works silently at 30 dB so the thermostat can come down. It is the unit bought for summer that also pays for itself in January.
Winter mode is not a bonus: it turns a summer purchase into five months of heating savings. Even air from floor to ceiling, 1 to 2 °C less on the setpoint, 7 to 14 % less consumption for the room, for under 5 euros of electricity per season. The Boréal 107, reversible from its remote, silent and invisible when off, does that job in every room it is fitted in.
Frequently asked questions
Does a ceiling fan's winter mode really save heating?+
Yes. It evens out a stratified room where the ceiling is 3 to 4 °C warmer than the floor. At equal comfort you lower the thermostat by 1 to 2 °C, 7 to 14 % less heating consumption for the room, for 5 to 10 W of fan consumption.
Which speed for winter mode?+
Speed 1, reverse rotation, continuously during heating hours. The aim is slow mixing with no perceptible draught: at occupant level the air moves below 0.2 m/s. A higher speed creates a cold feeling and cancels the benefit.
Does winter mode create a draught?+
No, at speed 1. In reverse rotation the air is drawn up to the ceiling and comes back down along the walls, not onto people. You feel nothing, but a floor thermometer gains 1.5 to 2 °C in half an hour.
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