The house is at a reasonable altitude, so the summer temperature, out in the shade, is a comfortable 78 F, and the nights are close pleasant. It is a sweltering 100 F in the summer Sun, though. I have wood for heating in the winter, but not much electricity for cooling in the summer, so my intention is to design a house primarily for passive cooling, with enough insulation to retain the heat in winter once heated with a fireplace. I wanted your opinion on a departure from traditional construction for a Zero Energy Home. My intention is to design the house, not as a rectangle, but as an octagon, with one side each facing North, South, East, West, South East, South West, North East, and North West. This would be somewhat of a South-facing house, but not exactly. I’m living in an extreme climate, with summer peaks of around 100 F and winters of around 26 F. The summer night-time temperature drops to around 71 F, for difference of around 30 F between the day-time and night-time temperatures, so I would like to quickly dissipate the heat gained by the South-facing front at night to take advantage of the cool outside temperature. In winter, I would like to absorb the heat from the Sun for the night. The entire South-facing (South, South East, and South West) portion of the octagonal house, I intend to use only during the days in summer and only during the night in winter. My intention is to use a highly reflective and emissive roof for the South-facing front to reflect the summer Sun during the day, and quickly lose the heat at night. This room can have a moderate enough emissivity to radiate the winter sun in during the day. For all the rooms oriented somewhat South (South, South East, and South West), I could use windows to capture the radiant heat during winter and use reflecting shutters to block this heat during summer. These windows can also be opened at night during the summer, to quickly lose the heat to the almost 30 F night-time drop in outside temperature. The roof for the entire South-facing (South, South East, and South West) can be sloped and constructed from sheets of galvanized steel from the), so it reflects the heat during the day and dissipates it at night. For the entire North-facing, the roof can be flat to reduce the surface area and constructed from reinforced steel concrete (with a layer of insulating material) to diminish heat radiation through a thick and non-reflecting material and to enhance heat retention through the solar mass. The windows for the South-facing can be large and double-paned with galvanized steel shutters, on the outside, to block radiant heat during summer and allow the radiant heat during winter. The entire North-facing and even South East-facing can have relatively smaller double-paned windows to be left open during the summer to cool air in, and shuttered, on the inside, with galvanized steel shutters during the winter to diminish radiant heat loss. The intention is to situate the kitchen in the South which will receive peak summer heat only during noon, when my servants are taking their siesta. My children’s rooms can face East, so that it is only hot during the early morning when they’re away at school, and quite comfortable when they return because the kitchen would block the afternoon Sun. The guest room can West, so that it is hot only in the afternoon when the guests are away, and is comfortable during the morning and evenings when the guests are in the house. The dining room can face South East, so that it is comfortable during early morning, afternoon, and evening. The laundry room can face South West, so it is warm throughout the day, and maybe can even serve as a lounge during winter. The master bedroom can face North East, so it only receives the Sun for a very short time in the morning (I can take quilts during winter), and I can take my afternoon nap. The rarely used drawing room can be in the North, so it is shielded during the summer. It doesn’t matter if it gets unbearably cold during winter, because it would be used for a very short time. I can have another bedroom for my children in the North West, so it isn’t too uncomfortable at night or during winter. The lounge can be in center of the octagon, so it is shielded from the Sun during summer and insulated during the winter by the rooms around it. The attic on top of the lounge can serve as a day-time lounge during winter, when it catches ample of sun, and night-time living room during summer if it can dissipate quickly dissipate the heat gained during the day and even catch the cool summer night breezes. I want the attic to have large windows on all sides, kept closed in winter, to allow for the passage of radiant solar heat in winter and opened up, at night, in summer to facilitate the dissipation of summer heat. A small North attic-window can be fed with cold war, through a duct from the North ground-level, and a small South attic-window, heated by the Sun, can be opened during the summer day to create a cross-ventilation channel from the north to the South of the attic, with the hot air from the South-window flowing out and cold air from the ducted North-window flowing in. The windows on the West and East would remain shuttered during the summer-day to retain the heat gradient between the North and South windows for the cross ventilation channel. I can also have cross-ventilation ducts running from 170-feet under-the-ground, running at ground level through the house, from floor-level in the North, with small vents in each room for climate control, to roof-level in the South to create a channel of geothermal-air through the house. Since deep-earth maintains the same temperature throughout the year, this geothermal-air will cool the house in summer and warm it in winter. Another cross-ventilation duct, at roof-level from North floor-level to South roof-level, can work as an exhaust to suck the hot-air out. The roof-level duct in the South can be kept hair than the Winter Sun to have the exhaust automatically disabled in winter. It would still need air-sealing and insulation, at both ends, during winter.