Condensation means a substances changes its state from vapor or gaseous phase to liquid phase (when it comes in contact with some surfaces). At standard pressure, water condenses at 100°C.
During condensation at 100°C, the water vapor releases the latent heat of vaporization. It is around 4,180 Joules/mole. The surroundings including the air get warmed up as this heat energy is transmitted to the surroundings through conduction, convection in the nearby air or radiation.