Ceiling fan

Needs power

Moves air across skin so sweat evaporates faster and a room feels cooler than the thermometer says. It cools people, not rooms, so running one in an empty room only spends power. Draws a fraction of what a cooling machine does.

One of 6 ways to meet Active cooling. Build 1/6, Upkeep 2/6, Efficiency not rated. Cost, carbon and footprint below are rated against those 6, not in absolute terms.

Cost: Low
Upkeep: Occasional
Skill to build: Basic
Lifespan: Long; the motor bearing is the wearing part and is usually replaceable
Embodied carbon: Low
Space / material use: Low
Output timing: On-demand/controllable
Skill to repair: Basic

What your site needs

Ceiling height enough to hang one safely above head height

Inputs

AC Electricity

Outputs

none

Ranking in its sub-function out of 6 alternatives

Every option in this sub-function, with the value on each axis and a note on what drives it (this solution highlighted):

Solution	Build skill	Upkeep burden	Efficiency
Night-flush cooling	Basic	2	N/A
Evaporative cooling	Basic	2	N/A
Heat pump (air- or ground-source), reversible mode	Specialist	8	N/A
Night-sky radiative cooling	Intermediate	4	N/A
Ceiling fan	Basic	4	N/A
Whole-house fan	Intermediate	5	N/A

Build skill and upkeep burden are proxies (lower burden = simpler to maintain); the efficiency column is this sub-function’s ranking, 1 = best. “N/A” where an axis isn’t rated here.

Sources

Building America Solution Center, "Passive and Low-Energy Cooling" (Pacific Northwest National Laboratory / US DOE): a "very effective option for providing sufficient air speeds for comfort ventilation"

Tutorials

No build tutorial recorded yet.

What this page does not tell you

No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.