a tent comprising : a ) a fabric covering including a plurality of longitudinal walls and end walls , wherein a first longitudinal wall has an opening having around its periphery a panel attachment means and wherein said longitudinal walls are sewn to said end walls ; b ) a support means positioned in proximity to each of said end walls sufficient to cause said longitudinal walls to form a triangle when affixed to a support means ; and c ) a panel containing a phase change material sufficient to heat said tent &# 39 ; s interior when cold and cool said interior when hot .