Make A DIY Air Cooler
Build a DIY air cooler using a small fan, ice packs, and cardboard; learn about airflow, heat transfer, and safe assembly while experimenting.
About this activity
Build a DIY air cooler using a small fan, ice packs, and cardboard; learn about airflow, heat transfer, and safe assembly while experimenting.
What you need
Step by step
- 1
Step 1
Gather all materials into your workspace.
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Step 2
Clear a flat table or floor area.
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Step 3
Lay the towel down to protect the surface.
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Step 4
Ask an adult to help before you use scissors craft knife or plug in the fan.
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Step 5
Measure the fan and mark a cardboard panel slightly larger than the fan using the ruler and marker.
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Step 6
With adult help cut the cardboard panel to the marked size using scissors or a craft knife.
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Step 7
With adult help cut a hole in the center of the cardboard sized for the fan's airflow.
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Step 8
Attach the fan to the cardboard by taping its edges over the hole with strong tape.
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Step 9
Place the shallow plastic tray on the towel behind the taped fan to catch melting water.
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Step 10
Put the frozen ice packs into the tray behind the fan so air will blow over them.
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Step 11
Secure the ice packs in place with tape so they do not slide.
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Step 12
Check that no ice pack touches the fan blades and ask the adult to adjust if any do.
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Step 13
Turn on the fan while an adult watches.
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Step 14
Hold your hand in the airflow to feel if the air is cooler and try moving the ice packs to see which setup feels coolest.
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Step 15
Share your finished DIY air cooler on DIY.org.
Fun facts
How do I build a DIY air cooler with a small fan, ice packs, and cardboard?
To build a DIY air cooler, cut vents in a cardboard box to create an airflow path. Mount a small fan so it blows air through the box, and place frozen ice packs in front of or inside a compartment where incoming air passes over them. Seal gaps with tape, position a shallow tray to catch any meltwater, and test the airflow. Always secure the fan, avoid water near electrical parts, and have an adult help with cutting and wiring.
What materials do I need to make a DIY air cooler at home?
You'll need a small electric fan (USB or battery-powered), frozen gel ice packs or sealed bottles of frozen water, a sturdy cardboard box or foam board, strong tape, scissors or a craft knife, a marker and ruler, a shallow tray to catch meltwater, zip ties or clamps to secure the fan, and optional insulating foam or fabric. Include adult supervision for tool use and make sure the fan is low-voltage and in good working condition.
What ages is this DIY air cooler suitable for?
This DIY air cooler is ideal for kids aged about 8 and up with adult supervision. Children 8–11 can help cut cardboard, arrange ice packs, and assemble parts while an adult handles sharp tools and electrical connections. Ages 12+ can do more of the build independently but should still check safety steps with an adult. For younger children (4–7), focus on non-hazardous roles like decorating and placing frozen packs under supervision.
What safety tips should I follow when kids build this DIY air cooler?
Safety first: always supervise children around the fan and frozen packs. Use a low-voltage USB or battery fan, keep all electronics dry, and never let meltwater reach the fan motor. Secure the fan firmly to the cardboard so it can't tip or vibrate loose. Use sealed ice packs instead of loose ice to prevent spills. When cutting cardboard, have an adult handle the craft knife. Keep small parts away from toddlers and unplug the fan before any adjustments.
Watch & Learn
Need help?
What can we use instead of frozen ice packs or a shallow plastic tray if those are hard to find?
Use frozen water bottles or a sealed bag of ice inside a shallow baking dish as substitutes for the frozen ice packs and the shallow plastic tray, and place them behind the taped fan exactly as the instructions say.
What should we do if the fan gets wet or the airflow doesn’t feel cool?
Make sure the fan is taped firmly to the cardboard with strong tape, confirm no ice pack touches the fan blades, and reposition the frozen ice packs and the shallow tray behind the taped fan while an adult watches so water won’t reach the plug or blades.
How can we adapt this project for younger kids or older kids?
For younger children have an adult do the measuring, cutting with scissors or a craft knife, and taping while the child places the frozen ice packs and feels the airflow, and for older kids let them measure, cut, assemble the taped fan-to-cardboard mount, experiment with ice-pack placement, and turn the fan on under supervision before sharing on DIY.org.
How can we improve or personalize our DIY air cooler?
Decorate or paint the cardboard panel before attaching the fan, add extra frozen water bottles or a scented cloth behind the taped fan for longer or nicer-smelling cool air, or angle the cardboard to change airflow and then share your finished setup on DIY.org.