panel 11 finally a further facing panel 38 may be secured as by adhesive or the like to the under surfaces 34 of the guide strips 32 and to the under surfaces 37b of spacer strips 37 if desired edge strips 39 may be secured as by adhesive or the like around all four edges of the assembled panel and contacts 39a with terminal pins 39b extending from the heat strip or film 11 extend through grooves 37b in the spacers 37 for connection to a source of electrical energy this assembled wall panel component as illustrated in fig1 includes a cool side at facing panel 29 and a warm side at facing panel 38 they may be used as wall panels or ceiling panels and if desired may be formed with an open grid facing panel 40 in place of panel 38 so that they can be formed similar to light fixtures and placed in the ceiling to direct heat downwardly through the open grid 40 the forming of the heat panel or strip 11 in a corrugated configuration sealed within the panel assembly gives a greater area of heating medium for a specified planar area the corrugation dimensions for the guide members 32 can vary according to design parameters and the radius of curvature of the heating film or strip 11 depends upon the.