Late last month, the Department of Energy (DOE) issued two rules affecting ceiling fans: a proposed rule that would establish the first efficiency standards for ceiling fans, and a final rule that improves the efficiency of the lights attached to ceiling fans.
The proposed ceiling fan efficiency standards would save about 11% of the energy used by ceiling fans. Energy savings would more than double, though, if DOE adopted a standard level based on advanced motor technology for residential ceiling fans.
Ceiling fans meeting the proposed new standards sold over 30 years would reduce national electricity consumption by about 80 billion kilowatt-hours, an amount equal to the annual energy consumption of over 7 million U.S. households, and would net savings of $0.8 to $2.8 billion for purchasers.
Most residential ceiling fans are sold with light kits, which are required to come packaged with light bulbs. DOE’s final rule revising the existing energy efficiency standard for ceiling fan light kits will reduce the amount of energy used by ceiling fan lights by 3.6%, and will come into effect in early 2019.
Over the next 30 years, ceiling fan light kits meeting the new standards will reduce national electricity consumption by about 14.4 million kilowatt-hours, equivalent to the annual average electricity consumed by 1.4 million homes. These savings will be worth $500 to $660 million to purchasers.
Ceiling fans are widely used
About 80 million U.S. households use at least one ceiling fan, and a quarter of all households use four or more ceiling fans. The standards issued today would cover both ceiling fans used in homes as well as ceiling fans that provide higher airflows for use in commercial and industrial applications.
There is a huge spread in the efficiencies of currently available ceiling fans. For example, just within ceiling fans that meet the current Energy Star specification, at high speed the most efficient fans are more than five times more efficient than the least efficient models.
The Energy Policy Act of 2005 (EPAct) established prescriptive standards for ceiling fans, requiring, for example, that they have adjustable speed controls. However, there are currently no performance standards for ceiling fans. The new proposed standards would require minimum energy efficiency levels, expressed as airflow delivered (in cubic feet per minute) per unit of power consumption (in watts).
According to data published with the proposed rule, standard residential ceiling fans complying with the proposed rule would cut consumers’ electricity costs to operate fans by about 40% compared with the least efficient fans on the market. DOE estimates that the purchase price would increase by only about $12 with the proposed standards, and that that additional cost would be covered by energy bill savings within 2 years.
The efficiency of ceiling fans can be improved by using more efficient motors and fan blades and by optimizing the fan design, such as by adjusting the blade pitch.
Brushless motors for commercial, not residential, fans
During the rule-making process, some manufacturers objected to a potential standard based on brushless DC motors, which can reduce power consumption by about 60%. The proposed standards issued today for residential ceiling fans could be met using more efficient conventional induction motors that can reduce power consumption by about 10%. Although DOE did not propose standards based on brushless DC motors for residential ceiling fans, the large savings they deliver could provide the basis for an updated Energy Star specification. The proposed performance standard levels for fans designed for commercial and industrial applications are based on advanced brushless DC motors.
Most ceiling fans have flat blades, although some have “unconventional” blades, such as blades in the shape of a palm leaf, which are generally less efficient than flat blades. In response to some manufacturers’ concerns, the efficiency levels evaluated for the proposed rule can all be met by flat blade fans as well as unconventional blade fans. In addition, today’s proposed rule would exempt “highly decorative” ceiling fans, which would be defined as fans incapable of spinning at high speeds or moving very much air.
Final rule on light kits
In its final rule on ceiling fan light kits, DOE closed a loophole which had allowed light bulbs with smaller bases to meet a less demanding standard. DOE decided not to require a level of energy efficiency that can currently only be met by Light Emitting Diode (LED) lamps, despite the fact that its own analysis showed that doing so would yield greater net benefits to purchasers than the lower efficiency level that was eventually chosen for the standard. The revised ceiling fan light kit standard will require CFLs or LEDs used to meet a slightly higher efficiency level than under the previous standard, preserving a wide range of choices for ceiling fan light kit buyers.
The final rule for ceiling fan efficiency is due by July 2016, and the new standards would take effect three years later.
Andrew deLaski is the executive director of the Appliance Standards Awareness Project. Joanna Mauer and Chris Granda of ASAP also contributed to this post, which was originally published at the website of the American Council for an Energy-Efficient Economy.