To make a cardboard air conditioner,
To make a cardboard air conditioner, take a sturdy cardboard box and cut holes in the top for a small fan and on the sides for air vents. Line the inside with aluminum foil to improve cooling. Place frozen water bottles or ice packs inside. Attach the fan over the top hole to blow air into the box, forcing cool air out through the vents. Secure the structure with tape or glue. As the fan pushes air over the ice, it cools before exiting. Replace the ice as needed. This DIY cooler works best for small spaces and short durations.