Also a Holtkamper patent is the Holtkamper Membrane Tentsystem, it is a natural air conditioner through the use of 2 layers of tent cloth which is sealed all around with zippers and Velcro so that the stagnant air provides insulation. Both on hot and cold days. On extremely hot days (+/- 35 degrees and more), the roof can be raised slightly to create an air flow between the roofs and through the special Membrane inner fabric on the inside fresh and clean air enters and pushes the warm air out.
