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The 5 Best Cooling Fans For Aquariums

Aquariums may become overheated. That is a proven truth. If you don't want to fight with keeping a suitable water temperature, especially on a hot summer day, you may want to consider purchasing an aquarium cooling fan.

This is why BestForPets (bestforpets.org) are here today to examine five possibilities, all of which are, in our opinion, great competitors for the title of best cooling fans for aquariums.


Aqua Cool Aquarium Cooling Fan by Zoo Med

This cooling fan is basic yet effective. It may not be the most elegant choice, but it gets the job done (you can check the current price here). Let’s examine the features immediately!


First and foremost, this specific aquarium cooling fan is suitable for nano aquariums, 5-gallon, and 10-gallon tanks. In actuality, despite the fact that it performs the job, it is a tiny fan, thus it is suitable for smaller tanks.

The compact size of the fan saves a little room, which is something that we can all enjoy. It has the potential to reduce water temperature by a few degrees, making it a great choice for hot summer days when your fish need to cool off.

The fan’s user-friendliness is another feature that we appreciate. It includes a suction cup that allows you to connect it directly to the side of your aquarium. Further than the suction cup, no other mounting hardware is required. This is a simple on/off the fan that goes on when the switch is flipped; however, there are no variable speeds available.

However, there is an adjustable duckbill control vent that may be utilized to admit more or less air through the fan and to the aquarium water’s surface. The angle of the Zoo Med Cooling Fan can also be modified, allowing you to direct the airflow precisely where you want it to go.


  • Energy-efficient.
  • Duckbill vent.
  • Adjustable angle.
  • Simple installation using a suction cup.
  • Comparatively space-friendly.
  • Ideal for tiny tanks.


  • Not equipped with speed adjustment.
  • Not appropriate for tanks beyond 10 gallons.


Petzilla Aquarium Chiller

This model is considerably larger and stronger than the last alternative we considered, which comes with its own advantages and disadvantages. Let’s examine what the Petzilla Aquarium Chiller has to offer (you can check the current price here).


In addition to being easy to use and install, the Petzilla Aquarium Chiller is one of our favorite features. It includes an AC power cable converter, so there are no power-related concerns. In addition, a basic clip holder is included for attaching.

As long as the aquarium lip is no broader than 0.5 inches, the clip for this fan may be placed directly over it. It does not require any additional assembly or installation. The clamp is sturdy and secure, preventing the chiller from toppling over, especially into your aquarium.

This specific model features two fans, making it rather strong. It can easily accommodate a 20-gallon tank, and maybe a somewhat bigger one. It is capable of offsetting the temperature by up to 4 degrees Celsius if left on its maximum setting. It has two speeds, high and low, for selection.

Additionally, the angle of each of the two fans can be modified, allowing you to focus the airflow on a specific area of the tank. The Petzilla Aquarium Chiller is simple to operate, effective, sturdy, and stable, and it can be used for both saltwater and freshwater aquariums.


  • Ideal for up to 20-gallon tanks.
  • A reliable and simple clamping mechanism.
  • Compatible with both saltwater and freshwater aquariums.
  • Dual speed.
  • Adjustable angle of airflow.
  • There is no assembly required.


  • Causes quite a deal of evaporation.
  • Quite loud.


Aquarium Cooling System by iPettie

This compact cooling fan is suitable for nano tanks and other small aquariums, despite the fact that it has three distinct micro fans. Let’s examine the features of the iPettie cooling system in further detail.


This is a very compact and energy-efficient cooling system, which may appeal to certain individuals. Even if the iPettie Aquarium Cooling System operates all day, you probably won’t even notice a change in energy use. This item’s modest size means that it will occupy very little room, which is something we like.

It has a straightforward clamping mechanism for installation. Simply attach it to the aquarium’s rim and you’re set to go. Be aware that the clamp will not fit aquarium lip widths exceeding 15 mm. In addition, there is no assembly necessary, and mounting is quite simple.

Depending on the number of lights and other heat-generating accessories, the iPettie Cooling System is suitable for tanks up to 8 gallons in size. This fan should be able to reduce the temperature in a tank with standard lighting by roughly 2 degrees Celsius.

This Cooling System’s speed and airflow direction cannot be adjusted. It is a simple, fixed, tiny, energy-efficient aquarium cooling fan.


  • Very compact and space-efficient.
  • Fairly quiet.
  • Simple to operate and install.
  • There is no assembly required.
  • Low energy utilization.
  • Ideal for aquariums of up to 8 gallons.


  • Not adjustable for speed
  • The angle is not adjustable.
  • It is ineffective for bigger tanks.


JEBO F-9020 Cooling System Fan

This is another straightforward and user-friendly aquarium fan to consider. It just has one fan, yet it is one of the most powerful solutions on our list thus far. Let’s look at the JEBO Cooling Fan in further detail.


The JEBO Fan is not the smallest available, but it is still tiny enough not to impede your progress. It has a straightforward clamping method. This means that you only need to clamp this fan onto the edge of your aquarium and you’re set to go.

Aside from that, the clamp is compatible with aquarium lip thicknesses up to 0.6 inches. Both the provided AC power cable converter and the lack of assembly requirements are helpful features.

This fan is rather modest, so it does not consume a great deal of energy, which is still another advantage; nevertheless, it does require more energy than some of the other solutions we have considered today.

It is one of the largest fans currently available, making it appropriate for aquariums up to 20 gallons, or somewhat bigger if the lighting is not particularly intense. The water surface and surrounding air temperature can be cooled by up to 8 degrees Fahrenheit.

The JEBO Cooling Fan is a simple on/off the fan, meaning that the fan speed cannot be modified. However, the angle of the fan is adjustable, which we appreciate. This fan is developed specifically for use in both saltwater and freshwater aquariums.


  • Useable for both saltwater and freshwater.
  • Extremely simple to install; simple mounting clip.
  • There is no assembly required.
  • Ideal for up to 20-gallon tanks.
  • Adjustable angle of airflow.
  • Fairly quiet.


  • Insufficient energy efficiency
  • Airspeed is not adjustable.


Aquarium Cooling System aFAN

This is one of the most powerful aquarium cooling fans available. Okay, so it’s not intended for enormous aquariums, but it can manage larger tanks than any other fan we’ve seen today. Let’s examine the aFAN Aquarium Cooling System in further detail to determine its purpose.


The aFAN Aquarium Cooling System includes corrosion prevention, which is one of its many appealing features. Many aquarium fans can’t handle saltwater settings owing to the corrosive salt, however, that is not the case with the specifically designed Cooling System. It can manage both saltwater and freshwater.

Our Cooling System is not a particularly huge fan, but it is somewhat larger than the smallest alternatives on this list; hence, it is of medium size. It will not interfere with your aquarium maintenance, but it is also not exactly a space saver.

It is not particularly energy efficient, but it can cool tanks up to 30 gallons in size, which is greater than any other fan we have examined today. The aFAN System should be able to reduce the temperature of a 30-gallon aquarium by up to 4 degrees Celsius, if the lighting is not too intense.

This Cooling System is extremely simple to install. A simple clip mounting system is included. Simply attach the fan to the aquarium’s rim, and it is ready for use. It requires no assembly or additional labor beyond installation.

This fan’s angle is adjustable, allowing you to manipulate the airflow. Currently, there are two speeds available for selection. This fan is also intended to produce consistent airflow without producing waves or turbulence in the water.


  • Very refined airflow.
  • Adjustable airflow.
  • The adjustable direction of airflow
  • Can manage tanks as large as 30 gallons.
  • Easy to install.
  • There is no assembly required.
  • Specially treated for seawater.


  • Insufficient energy efficiency
  • Quite loud.

Buyer's Guide

Cooling fans for aquariums may be quite handy and sometimes even essential. There is one primary reason why you might require an aquarium fan. This is the case if the air temperature and water temperature are constantly excessive. Perhaps your lights are really bright, the filter generates a great deal of heat, or it is a particularly warm summer day.

The idea is that your fish can only tolerate so much warm water before it badly affects or kills them. Aquarium cooling fans can combat heat and keep your fish alive, healthy, and content. Various species of fish require varying water temperatures, therefore this is undeniably crucial.

Before you go out and get one, ensure that it matches your needs. Ensure that it is large enough to manage the volume of water you have, that it is sturdy, and that it consumes as little energy as possible.


BestForPets (bestforpets.org) hope that this information assisted you and brought you closer to making a purchase choice for the best cooling fans for aquariums. Each of the five methods listed above is a viable option (Zoo Med is our top selection), and we hope that we have provided you with suggestions and guidance for keeping your aquarium cool.

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Dr. Deborah Fletcher

Deborah R. Fletcher, DVM, is a skilled veterinarian with more than 15 years of experience dealing with companion and exotic animals. She has experience caring for a variety of animals, including household cats and dogs, reptiles, birds of prey, and even primates. Dr. Fletcher is a valuable part of the BestForPets team, where she contributes to their aim of providing pets and their owners with the finest possible treatment and services.

Veterinarian (DVM) Dr. Deborah Fletcher


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