TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Apparatus: The temperature adjusting apparatus has absorber for forming mixture of refrigerant and absorbent, generator for receiving mixture from the absorber, heating the mixture, and increasing the pressure of the refrigerant vapor, compressor for receiving the vapor from the generator and increasing its pressure, condenser for receiving the vapor from the compressor and condensing the vapor under pressure to a liquid, pressure reduction device for reducing pressure of liquid to form mixture of liquid and vapor refrigerant, evaporator for receiving the mixture of liquid and vapor refrigerant to evaporate the remaining liquid to form refrigerant vapor, and conduit for passing refrigerant vapor to the absorber. The condenser and evaporator are located in proximity to to-be-heated product, medium or space.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Refrigerant: The refrigerant is chosen from hydrofluorocarbon, hydrochlorofluorocarbon, chlorofluorocarbon, fluorocarbon, nitrogen, oxygen, carbon dioxide, ammonia, argon, hydrogen, water and non-fluorinated hydrocarbon. The non-fluorinated hydrocarbon is chosen from 1-4C linear, branched or cyclic alkane and 1-4C linear, branched or cyclic alkene. The hydrofluorocarbon is chosen from difluoromethane (HFC-32), pentafluoroethane (HFC-125), 1,1,2,2-tetrafluoroethane (HFC-134), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1,1-trifluoroethane (HFC- 143a), 1,1-difluoroethane (HFC-152a), and fluoroethane (HFC-161). The hydrochlorofluorocarbon is chlorodifluoromethane (HCFC-22). The chlorofluorocarbon is dichlorodifluoromethane (CFC-12). The fluorocarbon is chosen from perfluoromethane (FC-14) and perfluoroethane (FC-116). The non-fluorinated hydrocarbon is chosen from methane, ethane, ethylene, propane, cyclopropane, propene, propylene, butane, butene, and isobutane.Preferred Absorbent: The absorbent comprises one or more ionic liquids. The ionic liquid comprises 11 claimed cations chosen from pyridinium, pyridazinium, pyrimidinium, pyrazinium, imidazolium, pyrazolium, thiazolium, oxazolium, triazolium, phosphonium and ammonium, such as pyridinium cation of formula (I) and pyridazinium of formula (II).R1-R6 = H; halogen; -CH3, -C2H5, or 3-25C linear, branched or cyclic alkane or alkene optionally substituted with chlorine, bromine, fluorine, iodine, hydroxyl, amine and thiol group; -CH3, -C2H5 or 3-25C linear, branched or cyclic alkane or alkene comprising 1-3 hetero atoms (I) chosen from oxygen, nitrogen, silicon and sulfur, and optionally substituted chlorine, bromine, fluorine, iodine, hydroxyl, amine and thiol group; 6-20C unsubstituted aryl or 3-25C unsubstituted heteroaryl having 1-3 heteroatoms (I); and 6-25C substituted aryl or 3-25C substituted heteroaryl having 1-3 heteroatoms (I), in which substituted aryl or heteroaryl has substituent chosen from -CH3, -C2H5 or 3-25 linear, branched or cyclic alkane or alkene optionally substituted with chlorine, bromine, fluorine, iodine, hydroxyl, amine and thiol group, hydroxyl, amine and thiol group.The ionic liquid comprises anion chosen from (CH3CO2)-, (HSO4)-, (CH3OSO3)-, (C2H5OSO3)-, (AlCl4)-, (CO3)2-, (HCO3)-, (NO2)-, (NO3)-, (SO4)2-, (PO4)3-, (HPO4)2-, (H2PO4)-, (HSO3)-, (CuCl2) -, Cl-, Br-, I-, SCN- and fluorinated anion. The fluorinated anion is chosen from (BF4)-, (PF6)-, (SbF6)-, (CF3SO3)-, (HCF2CF2SO3)-, (CF3HFCCF2SO3)-, (HCClFCF2SO3)-, ((CF3SO2)2N)-, ((CF3CF2SO2)2N)-, ((CF3SO2)3C)-, (CF3CO2)-, (CF3OCFHCF2SO3)-, (CF3CF2OCFHCF2SO3)-, (CF3CFHOCF2CF2SO3)-, (CF2HCF2OCF2CF2SO3)-, (CF2ICF2OCF2CF2SO3)-, (CF3CF2OCF2CF2SO3)-, ((CF2HCF2SO2)2N)-, ((CF3CFHCF2SO2)2N)- and F-.Preferred Composition: The mixture of refrigerant and absorbent comprises additive chosen from lubricant, corrosion inhibitor, stabilizer and dye. The mixture of refrigerant and absorbent comprises 0.05-99.95 mol% of refrigerant.