Ceiling Fan Direction in Winter and Summer, Explained
Counterclockwise in summer, clockwise at low speed in winter. ENERGY STAR says the summer direction makes a breeze and a wind chill, and the winter one a gentle updraft that brings warm air down from the ceiling. The saving is in the thermostat: DOE says a fan lets you set it about 4°F higher in summer with no loss in comfort. A fan cools people, not rooms, so turn it off when you leave.
Ceiling fan direction is a small setting that matters in both seasons. ENERGY STAR says to run a fan counterclockwise in summer and clockwise in winter, and the Department of Energy says the same.
The fan itself does not heat or cool the room. What it changes is how warm or cool you feel, and so how far you can move the thermostat. This page covers which way, how to switch it, and where the saving comes from.
Before you start
What to carry: a torch and a steady stepladder, to find the switch on the motor housing. Five minutes.
Gas or electric? Either. A fan works the same whatever heats and cools the house. What changes is how you set the thermostat around it.
Which way is it turning now? Stand under it on a middle speed. ENERGY STAR says that in the summer direction you should feel a cool breeze. If you feel almost nothing, it is probably set for winter.
A fan cools people, not rooms. ENERGY STAR and DOE both say to turn it off when you leave the room. Left running in an empty room it only uses electricity.
Fitting a new one. ENERGY STAR says to read the maker’s instructions first, use a metal box marked for ceiling fans, and anchor it to a joist where you can, because a fan can weigh as much as 50 pounds.
Which way, and why
Set the direction for the season
Summer: counterclockwise. ENERGY STAR says the airflow creates a wind chill effect, making you feel cooler, and you should feel the breeze standing under it.
Winter: clockwise, on low. ENERGY STAR says to reverse the motor and run the fan at low speed clockwise. That makes a gentle updraft which forces the warm air near the ceiling down into the room.
How to reverse it. Many fans have a small direction switch on the motor housing; others change direction from the remote or a wall control. The fan’s own manual shows which.
Why low speed in winter. A fast fan makes a breeze, and a breeze feels cold even when the air is warm. The point in winter is to mix the air, not to blow it at you.
Where the saving comes from
Move the thermostat with the fan
In summer. DOE says a ceiling fan lets you turn the thermostat up about 4°F without any loss in comfort.
In winter. DOE says turning the thermostat down 7 to 10°F for 8 hours a day can save as much as 10 percent a year on heating and cooling. With a heat pump, only do it with a thermostat made for one: what temperature to set.
The thermostat’s own fan switch. DOE says to leave the heating and cooling system’s fan on Auto unless a professional has set it to run continuously for air quality.
ENERGY STAR’s reminder. Adjust the thermostat when the fan is on. That is where the extra saving comes from.
When a fan helps most
Use it where the air is uneven
High ceilings. Warm air collects at the top of a tall room, so the winter setting does the most there, mixing it back down to where people sit.
Upstairs too hot. A fan helps the feel of a room but cannot fix a duct or insulation problem: upstairs too hot, downstairs cold.
One stuffy room. The causes of a single uncomfortable room are here: a stuffy room.
Buying or fixing one
Pick an efficient fan and keep it balanced
The label. ENERGY STAR says its certified fan and light units are 40 percent more efficient than conventional ones and save about 180 dollars over a fan’s 10 year life. The EnergyGuide label shows the airflow, the watts and the airflow per watt.
A wobble. ENERGY STAR says to check every connection is tight and the blades line up, then use a balancing kit, which comes in the box or free from the maker.
The light. If you add a light kit, ENERGY STAR suggests a certified one.
Questions people ask
Which way should a ceiling fan turn in winter?
Clockwise at low speed. ENERGY STAR says that makes a gentle updraft that forces the warm air near the ceiling down into the room.
Which way should a ceiling fan turn in summer?
Counterclockwise. ENERGY STAR says you should feel a cool breeze under it, and the wind chill makes you feel cooler.
How do I know which way my fan is turning?
Stand under it on a middle speed. A clear breeze means the summer direction. Almost nothing means the winter one.
Does a ceiling fan help heat a room?
It does not add heat, but on the winter setting it brings the warm air near the ceiling back down to where you are.
Should I leave the ceiling fan on all the time?
No. ENERGY STAR says fans cool people, not rooms, and DOE says to turn a fan off when you leave the room.
How much can I raise the thermostat with a fan on?
About 4°F in summer without any loss in comfort, the Department of Energy says.
Sources: ENERGY STAR "Ceiling Fan Installation and Usage Tips" and "Ceiling Fans Made Easy", and the U.S. Department of Energy Energy Saver Guide (2017)
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