An AC motor runs directly on alternating current from the mains socket and is simple and robust. A DC motor uses direct current via an inverter and is usually more energy-efficient, quieter and more precisely controllable, but also more expensive. For most households, an AC fan is sufficient; a DC model is mainly worth it if you want a lot of quiet use.
How does an AC motor work in a fan?
An AC motor runs on the alternating current from the mains socket. Its speed therefore depends on the mains frequency and is usually controlled in a few fixed settings, for example low, medium and high. This principle has been around for a long time and is widely used in affordable fans. The advantage is that the design is simple and the price remains low. The disadvantage is that you cannot adjust it as finely and that the motor is often slightly more audible at low settings than a DC motor.
How does a DC motor work?
A DC motor receives direct current. In a fan that is plugged into the mains, a built-in inverter converts the alternating current for it. Thanks to the electronics, you can control the speed in much smaller increments, which is why some fans have ten or more settings. DC motors are generally known to be more energy-efficient and quieter. How much more energy-efficient depends on the model. Therefore, always check the power in the product specifications itself, instead of relying on the motor type alone.
Want to know more about how much electricity a fan uses in practice? Then read how many watts a fan consumes per hour. Milieu Centraal provides general background on the electricity consumption of household appliances.
AC or DC: what to look for?
The motor type does not tell you everything. The noise is also determined by the blades, the housing and the selected setting, and the consumption by the power. A 55W AC fan uses 0.055 kWh per hour during continuous use. Based on an assumption of €0.30 per kWh, this costs about €0.017 per hour. That amount is low, so the difference with a DC model is usually small in euros, especially if you only use the fan for part of the year.
What usually matters more to you is the use. If you sleep with the fan on, noise counts; read what to look for in a quiet fan for the bedroom. Do you hear a humming or ticking sound? Then it is rarely due to the motor type, as you read in why a fan makes noise.
Direct answer: an AC motor is simpler and cheaper, with fixed settings. A DC motor is generally more energy-efficient, quieter and more finely controllable, but more expensive. Which one you choose depends on how often, how long and how quietly you use the fan.
Example: the Dynter AV25G with an AC motor
The Dynter AV25G pedestal fan has an AC motor according to the product page.
Energy consumption: 55W (AC motor)
Air speed: 5.3 m/s
Settings: control knob with three speed settings
Height: adjustable from 80 cm to 125 cm
Oscillation: automatic distribution of air in a wide angle
Foldable: up to 42 × 42 × 20 cm; weight 3.49 kg
You can read more about the pros and cons of this foldable design in is a foldable pedestal fan useful?
Overview: AC versus DC
| Feature | AC motor | DC motor |
|---|---|---|
| Current type | Direct alternating current | Direct current via inverter |
| Number of settings | Often 3 | Often more, more finely controllable |
| Noise | Varies by model | Generally quieter |
| Consumption | Average | Generally lower |
| Price | Generally lower | Generally higher |
The columns show general trends and do not apply to every model. Check the product specifications.
Choose the fan that suits you
Are you looking for an affordable, adjustable fan? Check out the Dynter AV25G or the full range of air conditioners and fans.
Frequently asked questions
Is a DC fan always more energy-efficient?
Not always. Usually the consumption is lower, but it depends on the model and the setting. Look at the power in the specifications.
Is an AC fan noisy?
Not necessarily. The noise is also determined by the blades and the setting. At higher settings you will hear every type of fan better.
What is better for the bedroom?
A quiet model with a low setting is the most important. DC motors are known for their quiet operation, but a well-adjusted AC fan can also perfectly suffice.
Does a DC motor last longer?
We cannot say that generally. The lifespan depends on the quality of the product and the use.