No AC bus. The bus route is long and boring too. Simply take the direct train. But feel free to check for superlux bus services, the portals for that are mentioned in top question on public transport.
<Erik> & [Sandya]
There must be private AC bus operators than government AC buses .
There are enough ac busses from valachchana to colombo. But those are started from baticalo, kalmunai, akkaraipatthu. Unless you are traveling after a long weekend you won't need to pre book seats. Just google for bus booking site and search in few of them. Ac bus(luxury category) is the best option
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