What is heat of vaporization? How can it be used at temperature as low as 25 °C? When I first learned this term. I was introduced to this graph: 

The heat in this case is at 100 °C, which I had ever since believed to be the only temperature of vaporization, assuming vaporization = boiling.

Then I saw a table with all the heat of vaporization values for different compounds. Most importantly, all these values apply to reactions at 25  °C. 

Different heat of vaporization values apply to different temperature. but water, for ex., cannot boil, with vapor bubbles, unless at 100 °C, thus all the energy used will just be used to simply raise the temperature. wouldn't it?
Think of vaporization as the removal of the fastest molecules. The separation of the gaseous form from the more closely-bound liquid therefore removes energy from the liquid. The heat of vaporization can apply at much lower temperatures than the BP of water at atmospheric pressure. Even on a day when the temperature is well blow freezing, laundry will dry on a clothesline because ice evaporates (well, sublimes). Also, water at skin temperature soon feels cold as it loses heat through evaporation.

BTW, the boiling point of water is 100 °C only at 1 atmosphere; see this video of water boiling at room temperature, ~25 °C.