The thermal performance of a chemical heat pump using reaction system of calcium oxide/lead oxide/carbon dioxide is demonstrated by experimental results and analyses of a CaO/CO2 bed reactor. The energy analysis based on the experiments show that it is possible to utilize high temperature heat with this heat pump. This heat pump can store heat above 850°C and then output it to a heat sink above 900 °C at atmospheric pressure, facilitated by CaO carbonation. An applied system that combines the heat pump with a high-temperature process is proposed for high-efficiency heat utilization. The scale of the heat pump in the combined system is estimated from the experimental results.