Yes the cabins and ship inside will be fine - airconditioning is excellent- we have been on OV1 several times and it has always been fin.
Ocean Village cabins are air conditioned, and if you feel a little chilly, then you are able to turn on the heat also. The ship is air conditioned throughout, so you don't need to worry about being too warm.
I've travelled twice with OV 1 and it was fine - aircon in bedrooms - adjustable - comfortable aircon levels in public areas on the ship. Would suggest you wear something with sleeves in the cinema which was cooler.
Willians, Morpeth 16 Aug 0.