A washing and drying machine according to an aspect can promote an Improvement in heat exchange efficiency, efficiently perform a heat exchange, save a space, and shorten drying time. The washing and drying machine includes a drum configured to rotate about a rotary shaft, a tub provided at an outside of the drum to accommodate the drum, a circulation flow path configured to circulate air into and out of the drum, a blowing device provided on the circulation flow path to circulate air, a circulation duct provided on the circulation flow path and having a fan connection and a plurality of independent duct systems that converge at an upstream side of the fan connection, a dehumidifier provided in one or more of the plurality of duct systems, a water supply device installed around the plurality of duct systems and having a valve provided to supply a dehumidifying coolant to the dehumidifier; and a controller configured to control the blowing device to adjust a flow of air flowing in the circulation flow path and
