Solar heated shelter with moveable secondary roof

A solar energy heated shelter comprising:

• a rigid, substantially horizontal frame adapted to be disposed upon a supporting surface, said frame defining a generally flat floor surface;
• a first upright, generally vertical end wall coupled to said frame;
• a second upright, generally vertical end wall spaced apart from said first wall and coupled to said frame;
• wall support means extending between said first and second end walls for maintaining said first and second walls in an upright generally vertical position;
• a first flexible weather-resistant roof layer extending between and fixed to said first and second end walls, said first roof layer forming roof and side walls, and thereby cooperating with said frame and said first and second end walls to define an enclosure;
• a second flexible roof layer moveably mounted relative to said first roof layer for movement between a storage position, wherein said second roof layer is clear of said first roof layer to permit solar energy to be incident on said first roof layer, and a deployed position, wherein said second roof layer at least partially covers said first roof layer to intercept solar energy otherwise incident on said first roof layer and to better contain within said enclosure solar energy already absorbed by the enclosure;
• storage spool means carried by said frame for storing said second roof layer when in storage position and for selectively outputting said second roof layer in response to unwinding of said spool means to move said second roof layer to deployed position;
• take up spool means revolvably attached to said frame opposite said storage spool means for cooperating with said storage spool means to draw said second roof layer into deployed position over said enclosure;
• and
• door means defined in at least one of said first and second end walls for selectively enabling access to said enclosure.