Passive solar design (PSD) is concerned with the use of the solar energy for heating and cooling of living quarters. It involves selection, construction, and use of appropriate PSD systems to sustain a comfortable temperature and humidity range in a home drawn from solar energy, daily or annually.
PSD reduces the need for active heating and cooling systems, as PS technologies use only solar heat, bringing down operating costs to zero. No greenhouse gases are emitted. The maintenance costs are also low since no mechanical systems are needed.