@property<EOL><INDENT>def annual_heating_design_day_996(self):<DEDENT>
self._load_header_check()<EOL>if bool(self._heating_dict) is True:<EOL><INDENT>avg_press = self.atmospheric_station_pressure.average<EOL>avg_press = None if avg_press == <NUM_LIT> else avg_press<EOL>return DesignDay.from_ashrae_dict_heating(<EOL>self._heating_dict, self.location, False, avg_press)<EOL><DEDENT>else:<EOL><INDENT>return None<EOL><DEDENT>
A design day object representing the annual 99.6% heating design day.