Disclosed is a ventilation arrangement for buildings with heat removal from an exhaust-air flow (L.sub.Ab) discharged from the building and/or from a fresh-air flow (L.sub.zu) supplied to the building, the arrangement having a heat pump which has a coolant/water heat exchanger (WW) with a mass flow controlled by the water system and having a coolant/air heat exchanger (LW.sub.zu, LW.sub.Ab) serving the fresh-air flow (L.sub.zu) and the exhaust-air flow (L.sub.Ab), the coolant/air heat exchanger (LW.sub.zu, LW.sub.Ab) being connectable in series to the coolant/water heat exchanger (WW).