We are in the beginning phases of creating our small space of abundance, but one success we have had is in the passive solar heating of our house.  The southeast wall is about 140 square feet (20feet long and different heights). Glazing on this wall is around 90- 100 square feet, approximately 65-70%.  We live at latitude 59 so thats a bit more than the recommended minimum rule of thumb (percentage equal to latitude).  Here is a year round heating climate, with summer highs around 60 f.  These days we don't need any supplemental heat and occasionally have to spill heat by opening windows when on sunny days the temperatures inside go well over 80f, but the cool 60degree breeze from outside is just lovely.  As I type this, i'm not wearing a shirt, its 70 degrees inside and i'm looking at a fruiting tomato plant.  Its about 50 degrees outside and tomatoes generally don't fruit outdoors here, and we haven't used any heat other than the sun and incidental heat from cooking inside in weeks.  We are really thrilled about this!.  And I want to share the glazing system i used to do this in a low cost way.  3'x6' clear acrylic panels were purchased. I used one panel on the outside, well flashed to direct water out and sealed it with caulk.  I used a 3/4" wooden spacer and then put weather stripping and tightly fit a second panel to the weather stripping inside the house, holding it in place with 3/4"x3/4" ripped boards screwed onto the wooden frame..  I put a little silica gel in the bottom in the space in between the panes for good measure, and, here is the secret:  I drilled 1/4" holes in the outside pane, at opposite corners (bottom left and top right or vice versa).  This is the secret to keeping them from fogging in between.  Its almost impossible to keep the inside humid air from getting between the panes and cooling down and dropping its water, but if a small amount of the cooler drier outside air is allowed in the space, it heats up and therefore can take on more moisture, which keeps the space fog free.  This same principal could be used to rehab fogged thermal panes.  The insulative value is lowered very little.  When we had just single panes, they were constantly covered in water droplets running down them on the inside facer, and with 2 panes, even with the holes on the outside, there is almost no condensation on the inside pane, only slightly more than the high end commercial thermal panes we have for opening windows elsewhere in the cabin.