• physics [ convection , conduction , radiation , respiration , evaporation , insulation , infiltration , exfiltration ]
• body temperature danger [ conditioning ; prevention ; treatment]
• maintaining body heat equilibrium [ease it, raise it, cover it, reflect it, don't sweat it]
• building cold & heat tolerance [as a constant exercise; sleeping cooler ; bloodflow]
• hayboxes
• firebed & headhole [2 hour burn , 4 inches dirt , 8 inches deep ]
• solar hot water heating from recycled materials
• solar thermal heating [inc. compost hoop-shaped heater]
• cold hole , cold cellar , root cellar [inc. garbage can root cellar ]
• ice caves , ice houses , ice boxes
• spring houses , stream immersion & cold rooms
• two bucket / pot-in-pot evaporative cooler [ Xeer pot ]
• cabinet-style evaporative cooler