to a buyer than a grid-tied building of similar design.

The aesthetics of passive solar also add value. Large glazed windows on spacious, well-lit living areas facing south over a pleasant vista provide a far more attractive option than squinty little windows one can barely see through.

On top of that, passive solar adds independence to your home. In times of extreme weather conditions, disaster or failing utilities, you will be better off than people who rely completely on grid-based heating. While others are stuck without any heat from electric fan-driven systems, your home will remain much more comfortable. That alone is worth a great deal and adds to the resale value of a property.