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Heat insulation blanket (10) includes a layer of inner cells (16) containing a phase change material, and opposed outer cells (18 and 19) containing dead air or other undisturbed gas. When placed in an attic or other insulated area, the phase change material changes phase when the outside atmospheri

Heat insulation blanket (10) includes a layer of inner cells (16) containing a phase change material, and opposed outer cells (18 and 19) containing dead air or other undisturbed gas. When placed in an attic or other insulated area, the phase change material changes phase when the outside atmospheric temperature passes the phase change temperature, resulting in a delay in the transfer of heat between the interior space and the atmosphere because of the heat required for or given up by the PCM during its change of phase. The outer plies of sheet material that form the superposed cells of the cell blanket are formed with a coating of heat reflective material that faces the interior of the cell blanket, whereby the reflective surfaces are protected against deterioration and retain their capacity to reflect radiant heat.

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1. A heat insulation blanket for reducing heat transfer between adjacent spaces, comprising: four plies of thermoplastic sheet material in superposed relationship, including a pair of outer plies and a pair of inner plies, said inner plies positioned between said pair of outer plies, thermally f

1. A heat insulation blanket for reducing heat transfer between adjacent spaces, comprising: four plies of thermoplastic sheet material in superposed relationship, including a pair of outer plies and a pair of inner plies, said inner plies positioned between said pair of outer plies, thermally formed heat seals formed in a lattice connecting all of said plies of sheet material in an array of sealed cells, said pair of inner plies and said heat seals forming inner cells between said pair of inner plies, each of said outer plies forming outer cells with one of said inner plies, said inner cells filled with phase change material, and said outer cells filled with gas. 2. The heat insulation blanket of claim 1, wherein: at least one ply of said sheet material is formed of heat reflective material. 3. The heat insulation blanket of claim 1, wherein: said outer cells include a first array of cells on one side of said inner cells and a second array of cells on the other side of said inner cells, and said cells of said first and second arrays of cells are substantially equal in volume. 4. The heat insulation blanket of claim 1, wherein: said outer cells include a first array of cells on one side of said inner cells and a second array of cells on the other side of said inner cells, and the cells of said first array of cells being of larger volume than the volume of said cells of said second array of cells. 5. The heat insulation blanket of claim 1, wherein said phase change material is selected from the group consisting essentially of: calcium chloride hexahydrate, sodium sulfate, paraffin, Na2SO4.10H2O, CaCl2.6H2O, Na2S2O3.5H2O, NaCO3.10H2O, NaHPO4.12H2O. 6. The heat insulation blanket of claim 1, wherein said gas is selected from the group consisting essentially of: air, carbon dioxide, nitrogen, argon, Freon, krypton, and xenon. 7. A heat insulation blanket for reducing heat transfer between adjacent areas comprising: at least three sheets of material positioned in adjacent superposed relationship, a lattice of seams connecting adjacent sheets of said material and forming multiple layers of superposed sealed cells between adjacent ones of said sheets, at least one of said multiple layers of sealed cells containing phase change material, and another one of the multiple layers of sealed cells containing a gas. 8. The heat insulation blanket of claim 7, wherein said gas is selected from the group consisting essentially of: air, nitrogen, carbon dioxide, argon, and Freon. 9. The heat insulation blanket of claim 7, wherein said phase change material is selected from the group consisting essentially of: Na2SO4.10H2O, CaCl2.6H2O, Na2S2O3.5H2O, NaCO3.10H2O, NaHPO4.12H2O. 10. A heat insulation blanket for reducing heat transfer between adjacent surfaces, comprising: a plurality of superposed plies of sheet material, said plies of sheet material connected together with a lattice of seams forming layers of cells between said plies, one layer of said cells containing phase change material, and another layer of cells containing heat reflective material. 11. The heat insulation blanket of claim 10, wherein said another layer of cells includes a gas filled space adjacent said heat reflective material. 12. The heat insulation blanket of claim 10, wherein: said plurality of superposed plies of sheet material include at least four plies of sheet material, said layer of cells containing heat reflective material includes cells positioned on opposite sides of said cells containing phase change material.