Your Inspection Business Name Goes Here. Your contact information goes here. Solar Heating active or passive methods existing buildings can be retrofitted to passively collect solar heat thermal mass wall or thermal mass floors can be incorporated thermal mass located where it will absorb sun the mass will release that heat gradually during the evening hours sun room with large south- facing windows sun room should be separated from the rest of the house planning to add or replace windows room air heater which uses an exterior wall- or roof-mounted flat plate collector Your Inspection Business Name Goes Here. Your contact information goes here.