Description says 10 ft of cooling but the specs lists 264 inches of tubing. Shouldn't this cover much more than 10 ft of cooling ?

Yes, the mist will cover more than 10 feet when spraying. However, the hose this comes with is 22 feet long. But only 10 feet of which include misting nozzles. The first 12 feet is meant from stretching from the faucet to the desired location and has no misting nozzles on it.