They aren't heated. They are refrigerator pickles, plain and simple.Pick the cucumbers early then. It helps with keeping them crunchy. Mine usually have a good snap, but can get soft in the center since I tend to pick them a little later. Also, any fully ripe cucumbers get turned into today or pickle chips. Spears have to be made from cucumbers that haven't fully ripened so they hold up through the canning process and deliver a crunch at the end.
Also, I'm curious to know how Clausen seals there pickles. They claim they are never heated. They are sold refrigerated though, but I do have an extra fridge in the garage that could hold some jars as long as they last a long time.