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An insulated door comprising a door shell having spaced first and second exterior panels. The door includes a plurality of stiffeners bonded to a liner panel, with thermal insulation between adjacent stiffeners, disposed within the door shell. The liner panel may extend along one side of the stiffen

An insulated door comprising a door shell having spaced first and second exterior panels. The door includes a plurality of stiffeners bonded to a liner panel, with thermal insulation between adjacent stiffeners, disposed within the door shell. The liner panel may extend along one side of the stiffeners and the thermal insulation along the liner panel between the stiffeners and the first and second exterior panels. The stiffeners and the liner panel are preferably made of steel and the stiffeners are welded to the liner panel. The stiffeners are preferably not welded to the first and second exterior panels of the door shell. The liner panel is preferably insertable into the first or second exterior panels of the door shell. The insulation material fills substantially all of the space between the liner panel and one of the first or second exterior panels.

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1. An insulated door comprising: a door shell having spaced first and second exterior panels; anda plurality of stiffeners bonded to a liner panel, with thermal insulation between adjacent stiffeners, the stiffeners, liner panel and thermal insulation being disposed within the door shell;wherein the

1. An insulated door comprising: a door shell having spaced first and second exterior panels; anda plurality of stiffeners bonded to a liner panel, with thermal insulation between adjacent stiffeners, the stiffeners, liner panel and thermal insulation being disposed within the door shell;wherein the liner panel is disposed between one side of the stiffeners and one of the first or second exterior panels, with a whole surface of the liner panel being disposed directly against an interior face of the first or second exterior panels; wherein the liner panel extends along one side of the stiffeners and wherein the thermal insulation is along the liner panel between the stiffeners and the first and second exterior panels. 2. The door of claim 1 wherein the stiffeners are welded to the liner panel. 3. The door of claim 1 wherein the insulation material fills substantially all of the space between the liner panel and one of the first or second exterior panels. 4. The door of claim 1 wherein the liner panel is self supporting. 5. The door of claim 1 wherein the liner panel is insertable into the first or second exterior panels of the door shell. 6. The door of claim 1 wherein the liner panel comprises a self-supporting insulation material bonded to the stiffeners. 7. The door of claim 6 wherein the insulation material is present between the stiffeners and at least one of the exterior panels and bonds the stiffeners to the at least one exterior panel. 8. The door of claim 6 wherein at least one of the stiffeners has a thickness less than the distance between the first and second exterior panels. 9. The door of claim 1 wherein the stiffeners and the liner panel are made of steel, the stiffeners are welded to the liner panel, and the stiffeners are not welded to the first and second exterior panels of the door shell. 10. The door of claim 1 wherein the stiffeners are not welded to the first and second exterior panels of the door shell. 11. The door of claim 1 wherein the door shell further includes door edges extending between a periphery of the first and second exterior panels. 12. The door of claim 1 further including a hinge for securing the door shell to a door opening. 13. A method of making an insulated door comprising: providing first and second exterior panels for a door shell;providing a plurality of stiffeners bonded to a liner panel, the liner panel being disposed between one side of the stiffeners and one of the first or second exterior panels;installing the liner panel against one of the exterior panels of the door shell with substantially a whole surface of the liner panel being disposed directly against an interior face of the exterior panels; installing the other of the exterior panels on a side of the door shell opposite the liner panel, either before or after installing the liner panel; and placing an insulation material between adjacent stiffeners along the liner panel, either before or after installing the exterior panel; wherein the liner panel extends along one side of the stiffeners and wherein the thermal insulation is along the liner panel between the stiffeners and the first and second exterior panels. 14. The method of claim 13 wherein the step of providing a plurality of stiffeners bonded to a liner panel includes providing the stiffeners welded to the liner panel. 15. The method of claim 13 wherein the step of placing the insulation material between adjacent stiffeners includes filling substantially all of the space between the liner panel and one of the first or second exterior panels. 16. The method of claim 13 wherein the liner panel is self supporting. 17. The method of claim 13 wherein the liner panel comprises a self-supporting insulation material bonded to the stiffeners. 18. The method of claim 17 wherein the insulation material is present between the stiffeners and at least one of the exterior panels and bonds the stiffeners to the at least one exterior panel. 19. The method of claim 17 wherein at least one of the stiffeners has a thickness less than the distance between the first and second exterior panels. 20. The method of claim 13 wherein the stiffeners and the liner panel are made of steel, the stiffeners are welded to the liner panel, and the stiffeners are not welded to the first and second exterior panels of the door shell. 21. The method of claim 13 wherein the stiffeners are not welded to the first and second exterior panels of the door shell. 22. The method of claim 13 wherein the door shell further includes door edges extending between a periphery of the first and second exterior panels. 23. The method of claim 22 further including providing a hinge for securing the door shell to a door opening and including fastening the hinge to at least one of the door edges at any step of the method. 24. An insulated door comprising: a door shell having spaced first and second exterior panels; anda plurality of stiffeners between the first and second exterior panels such that each of the stiffeners has a first side facing the first exterior panel and a second side facing the second exterior panel, each stiffener being spaced from adjacent stiffeners, the stiffeners bonded to a liner panel; wherein a whole surface of the liner panel being disposed directly against an interior face of the first or second exterior panels; at least the first side of each of the stiffeners being spaced from the adjacent first exterior panel; and a hardened foam filled in the spaces between adjacent stiffeners and between the at least first side of the stiffeners and the adjacent first exterior panel, whereby the exterior panels and the stiffeners are bonded to the foam. 25. The insulated door of claim 24 wherein the door shell further includes door edges extending between a periphery of the first and second exterior panels. 26. The insulated door of claim 25 further including a hinge securing the door shell to a door opening.