Maintaining a comfortable climate in your home is a challenge, especially when you consider the effect of air-conditioning and heating on your energy bill. Choosing the best ceiling fans for your home helps keep you cool in the summer—and even warm in winter. For the best results, you need to understand how the different types of energy-efficient fans work and how using your ceiling fan with your A/C can help lower energy costs.
Do Fans Use a Lot of Electricity?
Running a fan takes a lot less electricity than running an air conditioner; ceiling fans average at about 15-90 watts of energy used, and tower fans use about 100 watts. The best ceiling fans, window fans, towers and whole-house fans use only a fraction of the energy consumed by an air-conditioner. Using fans properly can help reduce your energy costs.
Energy-efficient ceiling fans
Ceiling fans are large fans that attach to the ceiling, and work by circulating the air in the room, pushing air down. This creates a “wind chill” effect that provides relief through evaporative cooling. Ceiling fans are permanent installations and only provide heat relief in the room in which they are installed.
How much energy do ceiling fans use?
How much energy a ceiling fan uses depends on the size of the fan. A fan with 36-inch blades uses approximately 55 watts an hour. A fan with 48-inch blades typically consumes 75 watts, while a 52-inch-blade fan uses 90 watts an hour.
ENERGY STAR® ceiling fans
Many energy-efficient ceiling fans are approved by ENERGY STAR®, and are designed to meet energy-efficiency guidelines set by the US Environmental Protection Agency. To reach these goals, ENERGY STAR® fans use motors, blade designs and LED or CFL lighting to reduce the watts consumed when the fan is in use.An ENERGY STAR® ceiling fan is up to 60 percent more energy efficient than non-certified fans. Although they require a more expensive initial investment, ENERGY STAR® fans are the best ceiling fans for anyone interested in lowering their electric bill.
Advantages of ceiling fans
Ceiling fans have a number of benefits:
- They are less expensive than A/C or whole-house fans.
- They are easily installed.
- They provide lighting in addition to heat relief (or can be retrofitted with lights).
- They consume less energy—particularly those fans with ENERGY STAR® ratings.
- They come in a wide range of styles and sizes.
Using your ceiling fan with your A/C can help you stay cool even when you set your air-conditioner thermostat higher.
Disadvantages of ceiling fans
Ceiling fans do have a few cons:
- Heat relief is limited to the same room as the fan.
- Fans only provide heat relief to people, not the room itself.
- Running the fan when no one is in the room wastes electricity.
Energy-efficient whole-house fans
Given their size, it’s not surprising house fans consume more power than ceiling fans. Exact energy amounts vary based on the size of the fan’s motor, but most whole-house fans use between 120 and 600 watts, according to the National Renewable Energy Laboratory—but this is still much less energy than a central air-conditioner uses.
How much energy do whole-house fans use?
Given their size, it’s not surprising house fans consume more power than ceiling fans. Exact energy amounts vary based on the size of the fan’s motor, but most whole-house fans use between 120 and 600 watts, according to the National Renewable Energy Laboratory—but this is still much less energy than a central air-conditioner uses.
Advantages of whole-house fans
In general, whole-house fans
- provide heat relief for the entire house,
- provide attic ventilation in addition to house cooling, and
- consume less energy than central air-conditioning.
Disadvantages of whole-house fans
On the other hand, whole-house fans
- can be noisy;
- can reduce the efficiency of the A/C;
- require professional installation;
- need tight-fitting vent covers in the winter; and
- can pull in carbon monoxide and other combustion materials from furnaces, water heaters and gas-powered appliances in the absence of proper ventilation.
Energy-efficient window fans
Window fans (sometimes called box fans) are installed in open windows to move air in and out of a house. While often used to circulate air in single rooms, window fans can be set up to cool an entire house some blow hot air out of the house while others pull cool air in.
How much energy do window fans use?
Like other types of fans, window fans use less power than an A/C unit. Most window fans typically consume between 35 and 100 watts an hour, depending on its make and model.
Advantages of window fans
One or multiple window fans come with several benefits:
- They are less expensive than ceiling or house fans.
- They draw in fresh air from outside.
- They are easy to install and uninstall.
- Multiple fans can be used to cool the home.
Disadvantages of window fans
The cons of window fans include the following:
- They require multiple units to cool an entire house.
- Air cavities surrounding fans must be blocked for maximum efficiency.
- They are less attractive than other fan options.
Energy-efficient tower fans
Tower fans are portable vertical fans designed to increase circulation. A tower fan does not bring air in from outside; instead, it moves air already in the house, relying in wind chill to provide heat relief.
How much energy do tower fans use?
Many models for tower fans typically use between 48 to 100 watts an hour to run, depending on their power setting. Most tower fans have at least three speed settings.
Advantages of tower fans
Tower fans offer several benefits:
- They come in a wide variety of colors and styles, including bladeless models.
- You can easily move them between rooms.
- They are usually affordable.
Disadvantages of tower fans
On the other hand, tower fans have a few cons:
- They have a limited range for air movement.
- They take up floor space.
- They can trap dust and dander.
Smart fans
Smart fans can turn on and off when rooms reach certain temperatures or can detect when the room is occupied through energy-efficient timers or motion detectors. Capable of linking to smart-home assistants, smart fans are part of the rising wave of home-automation products and can help reduce your overall energy costs.
Do smart fans save energy?
According to US General Services Administration data, smart fans can reduce energy costs by between 4 and 11 percent. In addition to turning off at optimal temperatures and in response to empty rooms, smart fans also save energy by adjusting fan speed in response to temperature changes.
Advantages of smart fans
Smart fans have a wide variety of advantages:
- They are highly energy efficient.
- They can be programmed to best fit your home’s cooling needs.
- Phone apps can control their use.
- You can track temperature and occupancy rates of rooms via apps.
Smart fans can connect to smart home devices.
Disadvantages of smart fans
The cons of smart fans are few but important:
- They are more expensive than most ceiling fans.
- They require additional steps for installation (For example, linking apps.)
How to use a smart fan
If you have a smart assistant or hub like Constellation Connect, you can connect to smart fans and link with other smart technology in your home. In addition to setting smartphones to detect temperature and occupancy, you can use home automation technology to turn fans on once you walk in the door, or you can link the fan to your air-conditioning or Wi-Fi-enabled thermostat.
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