A series of 25 tests was conducted to investigate cooling in room fires by sprinkler spray. The tests were conducted in a 3.66 m x 7.32 m x 2.44 m high test room, which had a 1.22 m x 2.44 m high opening centered in one of the 3.66 m walls. The fire source was a spray fire with constant heptane flow rate, located opposite the room opening. In each test only one sprinkler was installed at the ceiling. Three geometrically similar sprinklers with nozzle diameters of 11.1 mm, 8.36 mm, and 6.94 mm were tested. Convective heat loss rate through the room opening was measured with a large fire products collector. The total heat release rate of the fire was derived from the fire products collector measurements using a carbon balance method. Heat loss rate to the ceiling and walls was measured, as well as radiative loss through the opening. Empirical correlations for the heat absorption rate of the spray and the convective heat loss rate through the room opening were established. Experimental results obtained for a different room geometry also followed these correlations.