It has become abundantly clear, from your many comments, that most do not understand what passive solar heating means. Passive solar means there are no solar panels or any electricity involved in the creation and retention of heat within a building. The heat is created only by passive means of collecting energy from the sun and then retention of that heat by the physical structure of the home.
How is this done?
Number 1: The positioning of the structure is essential. Mike made certain that our home was positioned facing directly south, with a whole wall of the correct type of glass doors and windows. In our case that included incredible views of the Spanish Peaks! You need full sun exposure on that side of the house. No trees, buildings, or other obstructions.
Number 2: In a passive solar home, the slab of concrete the home is placed on must be the heat-sink type and FULLY insulated from the earth. If it is not, the heat will come into the home during the day, sink into the foundation, and leak out of the slab, leaving the home cold at night when heat is most needed.
Number 3: Excellent insulation in the walls and ceiling of the home are essential. Holding the heat in once it enters the home is the only way it can remain warm when it is zero degrees outside. The home must be close to air-tight with quality doors and windows. Your floor must also be some sort of dark tile to help absorb more heat during the day.
Number 4: Although the sun will be directly overhead in summer, proper overhangs on the south side of the home are essential to keep the sun from coming into the home too early in the fall. Mike also positioned our south-side overhang so that they are the correct size and angle to add solar panels later if needed.
Our home has very few windows on the north side, but a few on the east and west ends to absorb the morning and evening sun. We absorb solar heat most days in the winter, store it in our slab and it returns to keep us warm at night. Sometimes in mid-winter, we need to open a window at the warmest part of the day to cool off a bit!
So far in southern Colorado we have never fallen below 60 degrees at night no matter how cold it is outside. We supplement our solar heat with small room electric heaters. No furnace or propane needed. Ceiling fans help to distribute the heat.
Last January, when we lost electricity for three days because of a BAD ice storm, we stayed warm. With this system, we are able to average $100/month for all power to our home. A couple other unexpected benefits? Our home stays cool in the summer with its positioning to the sun and so much ceiling insulation, and it is so quiet inside all the time with no furnace turning on and off in winter!
The funniest part was learning that I didn’t need to turn down the thermostat when I left the house… the heat just keeps on coming in!