TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The hydrofluorocarbons are consisting of 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. The chlorofluorocarbon is dichlorodifluoromethane. The fluorocarbons are consisting of perfluoromethane and perfluoroethane. The non-fluorinated hydrocarbons are consisting of methane, ethane, ethylene, propane, cyclopropane, propene, propylene, butane, butene, and isobutane. An ionic liquid comprises a cation consisting of pyridinium, pyridazinium, pyrimidimium, pyrazinium, imidazolium, pyrazolium, thiazolium, oxazolium, and triazolium.R1-R6 = H; F; CH3, C2H5, or 3-12C optionally branched alkane or alkene, optionally substituted with C1-, Br-, F-, I-, OH-, NH2-, or SH-; CH3, C2H5, or 3-12C optionally branched alkane or alkene comprising 1-3 heteroatoms consisting of 0, N, Si and S, and optionally substituted with Cl-, Br-, F-, I-, OH-, NH2-, or SH-; 6-20C unsubstituted aryl or heteroaryl, wherein 1-3 heteroatoms are independently consisting of 0, N, Si and S; 6-20C substituted aryl or heteroaryl, wherein 1-3 heteroatoms are independently consisting of 0, N, Si, and S, 1-3 substituents are independently consisting of CH3, C2H5, or 3-12C optionally branched alkane or alkene, optionally substituted with C1-, Br-, F-, I-, OH-, NH2-, or SH-, OH-, NH2-, and SH-.The ionic liquid comprises an anion consisting of (CH3CO2)-, (HSO4)-, (CH3OSO3)-, (C2H4OSO3)-, (AlCl4)-, (CO3)2-, (HCO3)-, (NO2)-, (NO3)-, (SO4)2-, (PO4)3-, (HPO4)2-, (HSO3)-, (CuCl2)-, Cl-, Br-, and any fluorinated anion. The ionic liquid comprises butyl-3-methylimidazolium cation. It comprises 1-propyl-2,3-dimethylimidazolium cation. It further comprises cation consisting of 1,3-dioctylimidazolium and 1-octyl-3-methylimidazolium. Preferred Compositions: The composition is comprised of 0.05-99.95 mol.% of the refrigerant over a temperature range from the triple point temperature to the critical point temperature of the refrigerant at a pressure from vacuum to the critical pressure of the refrigerant. It comprises 0.1-99.9 mol.% of difluoromethane over -136.8-78.1degreesC at a pressure from vacuum to 57.8 bar. It comprises 0.1-99.9 mol.% of HFC-125 over -100.6-66degreesC at a pressure from vacuum to 36.2 bar. It comprises 0.1-99.9 mol.% of HFC-134a over -103.3-101degreesC at a pressure from vacuum to 40.6 bar. It comprises 0.1-99.9 mol.% of HFC-143a over -111.8-72.7degreesC at a pressure from vacuum to 37.6 bar. It comprises 0.1-99.9 mol.% of HFC-152a over -118.6-113.3degreesC at a pressure from vacuum to 45.2 bar. It comprises 0.3-81.2 mol.% of HFC-32 over 10-75degreesC at 0.1-10 bar.