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High-efficiency thermal insulation products and methods for use thereof for use in insulating buildings, residential homes, and other enclosed environments. In one arrangement, a thermal insulation product includes a substantially gas-impermeable envelope having first and second opposing surfaces an

High-efficiency thermal insulation products and methods for use thereof for use in insulating buildings, residential homes, and other enclosed environments. In one arrangement, a thermal insulation product includes a substantially gas-impermeable envelope having first and second opposing surfaces and a sealed interior portion between the first and second opposing surfaces, a support material within the sealed interior portion of the gas-impermeable envelope, and at least about 2 grams of a liquid per liter of a total volume of the sealed interior portion within the sealed interior portion. At least a portion of the liquid is operable to cyclically evaporate from adjacent one of the first and second opposing surfaces and subsequently condense adjacent the other of the first and second opposing surfaces depending on temperature differences between the first and second opposing surfaces.

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1. A method of insulating a building, comprising: positioning a plurality of thermal insulation products relative to a frame of a building;wherein each thermal insulation product comprises a substantially gas-impermeable envelope including first and second opposing surfaces and a sealed interior por

1. A method of insulating a building, comprising: positioning a plurality of thermal insulation products relative to a frame of a building;wherein each thermal insulation product comprises a substantially gas-impermeable envelope including first and second opposing surfaces and a sealed interior portion between the first and second opposing surfaces, a support material within the sealed interior portion of the gas-impermeable envelope, and at least about 1 grams of a liquid per liter of a total volume of the sealed interior portion disposed within the sealed interior portion;wherein the positioning includes orienting the plurality of thermal insulation products so that the first opposing surface faces an interior of the building and the second opposing surface faces an outside ambient environment;wherein at least a portion of the liquid is operable to evaporate from adjacent the first opposing surface and subsequently condense adjacent the second opposing surface when a temperature of the interior of the building is greater than a temperature of the outside ambient environment; andwherein at least a portion of the liquid is operable to evaporate from adjacent the second opposing surface and subsequently condense adjacent the first opposing surface when a temperature of the interior of the building is less than a temperature of the outside ambient environment. 2. The method of claim 1, wherein the positioning step comprises: arranging at least some of the plurality of thermal insulation products relative to a plurality of structural members of the building frame. 3. The method of claim 2, wherein the arranging step comprises: disposing at least some of the plurality of thermal insulation products between adjacent one of the plurality of structural members. 4. The method of claim 3, further comprising: securing a plurality of sheathing members over opposing sides of the plurality of structural members, wherein the at least some of the plurality of thermal insulation products are disposed between adjacent one of the plurality of sheathing members. 5. The method of claim 4, wherein the sheathing members comprise at least one selected from drywall, particle board, plywood, siding, and brick. 6. The method of claim 2, wherein the plurality of structural members comprise at least one selected from studs, joists and rafters. 7. The method of claim 2, wherein the plurality of structural members are made of at least one of wood, metal, and composites. 8. The method of claim 1, wherein at least some of the plurality of thermal insulation products comprise portions of composite building products. 9. The method of claim 1, wherein the portion of the liquid is operable to evaporate from adjacent one of the first and second opposing surfaces and condense adjacent the other of the first and second opposing surfaces diurnally. 10. The method of claim 1, wherein the sealed interior portion comprises at least about 2 grams of the liquid per liter of a total volume of the sealed interior portion. 11. The method of claim 1, wherein the sealed interior portion comprises at least about 4 grams of the liquid per liter of a total volume of the sealed interior portion. 12. The method of claim 1, wherein the sealed interior portion comprises at least about 10 grams of the liquid per liter of a total volume of the sealed interior portion. 13. The method of claim 1, wherein at least about 10% of the liquid within the sealed interior portion is operable to evaporate from adjacent one of the first and second opposing surfaces and condense adjacent the other of the first and second opposing surfaces during each cycle. 14. The method of claim 1, wherein at least about 70% of the liquid within the sealed interior portion is operable to evaporate from adjacent one of the first and second opposing surfaces and condense adjacent the other of the first and second opposing surfaces during each cycle. 15. The method of claim 1, wherein at least about 50 g/m3 of the liquid within the sealed interior portion is operable to evaporate from adjacent one of the first and second opposing surfaces and condense adjacent the other of the first and second opposing surfaces during each cycle. 16. The method of claim 1, wherein at least about 100 g/m3 of the liquid within the sealed interior portion is operable to evaporate from adjacent one of the first and second opposing surfaces and condense adjacent the other of the first and second opposing surfaces during each cycle. 17. The method of claim 1, wherein the pressure within the sealed interior portion is not greater than about 500 mbar at a temperature of about 20° C. 18. The method of claim 1, further comprising: a gas-permeable enclosure, wherein the support material is disposed within the gas-permeable enclosure. 19. The method of claim 18, wherein the gas-permeable enclosure is disposed between the support material and the gas-impermeable envelope. 20. The method of claim 19, further comprising: at least one desiccant disposed between the gas-permeable enclosure and the gas-impermeable envelope. 21. The method of claim 1, wherein the support material comprises a fine powder selected from at least one of silica powder and an aerogel powder. 22. The method of claim 21, wherein the fine powder comprises fumed silica. 23. The method of claim 21, wherein the support material comprises at least about 60 wt % of the fine powder. 24. The method of claim 21, wherein the support material comprises up to about 100 wt % of the fine powder. 25. The method of claim 1, wherein the support material comprises an infrared (IR) opacifier. 26. The method of claim 25, wherein the IR opacifier comprises at least one of titania, aluminum, iron oxide, silicon carbide, and carbon. 27. The method of claim 25, wherein the support material comprises at least about 5 wt % of said IR opacifier. 28. The method of claim 25, wherein the support material comprises not greater than about 25 wt % of the IR opacifier. 29. The method of claim 1, wherein the support material comprises not greater than about 0.1 wt % of fibrous materials. 30. The method of claim 1, wherein the support material comprises at least about 10 wt % of a structural filler. 31. The method of claim 1, wherein the support material comprises not greater than about 70 wt % of a structural filler. 32. The method of claim 30, wherein the structural filler comprises perlite. 33. The method of claim 1, wherein the support material comprises at least about 0.01 wt % of a getter. 34. The method of claim 1, wherein the support material comprises not greater than about 1 wt % of a getter. 35. The method of claim 33, wherein the getter comprises at least one of iron, barium, lithium, and zeolites. 36. The method of claim 1, wherein the support material comprises a total porosity of at least about 80%. 37. The method of claim 1, wherein the support material comprises a total porosity of not greater than about 98%. 38. The method of claim 1, wherein the support material comprises an average pore size of at least about 20 nanometers. 39. The method of claim 1, wherein the support material comprises an average pore size of not greater than about 2000 nanometers. 40. The method of claim 1, wherein the product comprises a density of at least about 80 g/l. 41. The method of claim 1, wherein the product comprises a density of not greater than about 280 g/l. 42. The method of claim 1, wherein the product comprises a thermal resistance of at least about 0.5 m2·K/W. 43. The method of claim 1, wherein the gas-impermeable envelope comprises a thickness of at least about 25 microns. 44. The method of claim 1, wherein the gas-impermeable envelope comprises a thickness of not greater than about 300 microns. 45. The method of claim 1, wherein the gas-impermeable envelope comprises at least one of a polymeric film and a metallic foil. 46. The method of claim 45, wherein the gas-impermeable envelope comprises an Ethylene Vinyl Alcohol (EVOH) barrier film. 47. The method of claim 46, wherein the gas-impermeable envelope comprises a coextruded polyethylene (PE)/EVOH barrier film. 48. The method of claim 46, wherein the gas-impermeable envelope comprises a metalized EVOH barrier film. 49. The method of claim 1, wherein the liquid comprises water. 50. The method of claim 1, wherein the product comprises a substantially planar product having spaced apart first and second sidewalls. 51. The method of claim 50, wherein a distance between the first and second sidewalls is at least about 2 mm. 52. The method of claim 51, wherein the distance between the first and second sidewalls is at least about 20 mm. 53. The method of claim 51, wherein a distance between the first and second sidewalls is not greater than about 100 mm. 54. The method of claim 53, wherein the distance between the first and second sidewalls is not greater than about 50 mm.