Your home must not have any windows -- or at least, any windows that receive direct sunlight. During the summer, we manually maintain the indoor temperature by

Your home must not have any windows -- or at least, any windows that receive direct sunlight. During the summer, we manually maintain the indoor temperature by following a simple -- but very manual -- formulaic process: - When it gets cooler outside than it is inside (evening, night), open the windows. - If it gets too cold outside, close the windows in rooms we're occupying. - When it gets warmer outside than it is inside (mid-day on), close the windows. - When the sun hits the windows directly, close the blinds. - When the sun stops hitting the windows, open them again. Rinse, repeat. If we follow these steps, we can keep the house a very comfortable temperature with zero energy costs. If we don't, it invariably gets too hot AND/OR too cold over a 24 hour period. "Add more insulation" doesn't help much, unless you're suggesting we use insulation as a window covering.