Abstract: Condensing exhaust air heat recovery fresh air all-in-one unit deals fresh air with the heat of building exhaust air as cold or heat source and has very high unit efficiency.In this paper, energy consumption influence of condensing exhaust air heat recovery fresh air all-in-one unit introduce to the office building of air source heat pump system is analyzed.Equipment is calculated using static and dynamic payback period of investment in fixed number of year. In a similar system condensing exhaust air heat recovery air machine has very good application prospects.

Key words: exhaust air, heat recovery, air source heat pump, investment payback