Each group needs:

• 1 (simple, homemade) air conditioning unit (see Figure 1); assemble in advance following the instructions in the Procedure section; units can be reused; materials: ~64-oz. (1.89-liter) rectangular plastic Tupperware container with lid, 1 foot clear plastic tubing at least ½-inch in diameter, hot glue sticks and glue gun, computer fan such as Digikey # 259-1558-ND for $4.78 at https://www.digikey.com/product-detail/en/MB50100V2-000U-A99/259-1558-ND/2757783, 2 AA batteries and battery holder such as Bud Industries # HH-3632/Newark # 34M2186 for $1.70 at http://www.newark.com/bud-industries/hh-3632/battery-holder-aa-wire-lead/dp/34M2186
• ice, ~1 quart
• foam, ~12 x 12-inch piece
• bubble wrap, ~18 x 18-inch piece
• newspaper
• masking tape scissors
• liquid crystal thermometer, such Brewer's Best #5426 (with adhesive backing for attaching to outside of clear container for accurate inside horizontal readings in 2-degree increments) for $1.66 at http://labelpeelers.com/brewers-best-liquid-crystal-thermometer-5426/?gclid=CLO15pfGl8cCFcsXHwodagQORA
• stopwatch, to measure testing times
• Suit Up! Worksheet, one per person
• Suit Up! Post-Test, one per person

To share with the entire class:

• an assortment of materials from which students choose to use in their designs, such as foam, newspaper, cardboard scraps (various sizes), bubble wrap, trash bags (any kind), clear plastic (Ziploc bags or any other type of clear, flexible plastic), aluminum foil, rubber bands, duct tape, clear scotch tape; students need not use all materials; add or remove materials as you see fit or have available
• materials for a challenge course (see Procedure instructions and Figure 2): syringe (3-6 ml works well), small beaker (300-500 ml) with water, 2 small cups (individual disposable paper cups work well), a handful of small candies or vitamins (such as Skittles® or Mike & Ike®) and a large bucket of water (3-5 gallons; 11-19 liters)
• 1 extra air-conditioning unit with a quart of ice, to serve as an un-insulated control for the class