A method for accelerated conditioning of a composite core sandwich coupon within a conditioning apparatus, wherein the composite core sandwich coupon comprises (i) an outer composite layer, and (ii) an inner core layer, and wherein the core layer comprises a plurality of cells, the method comprising: setting, at a first time by a controller of the conditioning apparatus, a first temperature and a first relative humidity level of the conditioning apparatus, wherein the first temperature is above room temperature and is between 60°C and 82°C, and the first relative humidity level is between 5% and 9%, and wherein a combination of the first temperature and the first relative humidity level correspond to a desired relative humidity level of the plurality of cells of the core layer at room temperature, wherein the desired relative humidity level is between 80% and 90%; maintaining, by the controller, the first temperature and the first relative humidity for a first period, wherein during the first period a core humidity of the plurality of cells in the core layer reaches the first relative humidity level; determining that the core humidity has reached the first relative humidity level; and based on determining that the core humidity has reached the first relative humidity level, adjusting, at a second time by the controller of the conditioning apparatus, the first temperature to a second temperature, wherein the second temperature is between the first temperature and room temperature, and wherein, responsive to adjusting the first temperature to the second temperature, the outer composite layer absorbs moisture from the inner core layer such that the humidity of the outer composite layer reaches a humidity corresponding to said desired relative humidity level of the plurality of cells of the core layer at room temperature. setting, at a first time by a controller of the conditioning apparatus, a first temperature and a first relative humidity level of the conditioning apparatus, wherein the first temperature is above room temperature and is between 60°C and 82°C, and the first relative humidity level is between 5% and 9%, and wherein a combination of the first temperature and the first relative humidity level correspond to a desired relative humidity level of the plurality of cells of the core layer at room temperature, wherein the desired relative humidity level is between 80% and 90%; maintaining, by the controller, the first temperature and the first relative humidity for a first period, wherein during the first period a core humidity of the plurality of cells in the core layer reaches the first relative humidity level; determining that the core humidity has reached the first relative humidity level; and based on determining that the core humidity has reached the first relative humidity level, adjusting, at a second time by the controller of the conditioning apparatus, the first temperature to a second temperature, wherein the second temperature is between the first temperature and room temperature, and wherein, responsive to adjusting the first temperature to the second temperature, the outer composite layer absorbs moisture from the inner core layer such that the humidity of the outer composite layer reaches a humidity corresponding to said desired relative humidity level of the plurality of cells of the core layer at room temperature.