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Condensation is exothermic. One reason we know this is because its counterpart phase change is vaporization and vaporization is endothermic. A more direct reason would be that in condensation the particles are beginning to move a lot slower, vibrate a lot less and more hydrogen bonds are forming. These all are releasing energy, as a lot less energy is needed to move at these slower speeds etc. And when energy is released it is exothermic.
As stated above, condensation is exothermic. When you look at it from a molecular standpoint, the molecules are transitioning from the gas phase to the liquid phase. Individual atoms are thus coming together and bonding with each other, a process that release excess heat as the bonded molecule is more stable and requires less energy. This energy is then given off as leftover heat.
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