A continuous annealing equipment (101; 201) including: a cleaning device for performing a cleaning treatment on a steel strip (S); an annealing device for performing an annealing treatment on the steel strip (S); an exhaust gas passage (131; 231) through which an exhaust gas discharged from the annealing device flows; a solution circulation passage (132; 232) through which a cleaning solution used in the cleaning device circulates; a heat exchanger (153; 253) which forms a part of the solution circulation passage (132; 232) and contacts with the exhaust gas; a cleaning solution tank (121; 221) for storing the cleaning solution; a circulation pump (152; 252) configured to circulate the cleaning solution from the cleaning solution tank (121; 221) through the solution circulation passage (132; 232); a temperature sensor (121a; 221a) configured to detect a temperature of the cleaning solution stored in the cleaning solution tank (121; 221); and a control device (133; 233) configured to control an operation of the circulation pump (152; 252), based on a detection result detected by the temperature sensor (121a; 221a), characterised in that the continuous annealing equipment (101; 201) additionally comprises in the solution circulation passage (132; 232) at least one of a liquid-heating device using a heat source other than the exhaust gas discharged from the annealing device and being capable of heating the cleaning solution flowing through the solution circulation passage , and a liquid-cooling device using a heat source other than the exhaust gas discharged from the annealing device and being capable of cooling the cleaning solution flowing through the solution circulation passage , wherein the control device (133; 233) is configured to control an operation of the at least one of the liquid-heating device and the liquid-cooling device . a cleaning device for performing a cleaning treatment on a steel strip (S); an annealing device for performing an annealing treatment on the steel strip (S); an exhaust gas passage (131; 231) through which an exhaust gas discharged from the annealing device flows; a solution circulation passage (132; 232) through which a cleaning solution used in the cleaning device circulates; a heat exchanger (153; 253) which forms a part of the solution circulation passage (132; 232) and contacts with the exhaust gas; a cleaning solution tank (121; 221) for storing the cleaning solution; a circulation pump (152; 252) configured to circulate the cleaning solution from the cleaning solution tank (121; 221) through the solution circulation passage (132; 232); a temperature sensor (121a; 221a) configured to detect a temperature of the cleaning solution stored in the cleaning solution tank (121; 221); and a control device (133; 233) configured to control an operation of the circulation pump (152; 252), based on a detection result detected by the temperature sensor (121a; 221a), characterised in that the continuous annealing equipment (101; 201) additionally comprises in the solution circulation passage (132; 232) at least one of a liquid-heating device using a heat source other than the exhaust gas discharged from the annealing device and being capable of heating the cleaning solution flowing through the solution circulation passage , and a liquid-cooling device using a heat source other than the exhaust gas discharged from the annealing device and being capable of cooling the cleaning solution flowing through the solution circulation passage , wherein the control device (133; 233) is configured to control an operation of the at least one of the liquid-heating device and the liquid-cooling device . <EOS>