had melted by taking advantage of the heat of fusion of the water mixed with the porous mineral insulation it was possible to avoid extreme warm and cold temperatures and the apples remained in excellent condition for eight months throughout the fall winter and spring even though ambient temperatures ranged between 5 u00b0 f and 60 u00b0 f during the storage period it will be apparent from the examples given that a single phase change insulation material will not be adequate for all uses or geographical areas it will also be apparent that for many climates i e warm or cold climates a phase change insulation material utilizing a proper phase change compound can be developed for areas where wide temperature extremes are experienced during different seasons non eutectic compounds having a wide range of freezing temperatures and melting temperatures may be useful layers of phase change insulation materials having different melting characteristics may also be used such layers can be achieved in different ways but a suitable method is to place the materials in sealed bags and then to place bags of insulation materials with desired different phase change compounds in face to face relationships as wall or ceiling insulation also it is sometimes necessary and desirable to store the insulation of the invention incorporating a phase change compound in a sealed bag that will prevent evaporation of the liquids used in the southwest united states where summer heat is a major problem and winter cold is not of major consequence a phase change insulation that will compliment air conditioning is desirable in cold climates where summer heat is not a major problem heat storing insulation is best for use.