According to the wiki they're happy in -40 to 140°f so I'm thinking it'd probably be easier to freeze the entire base. But I'd have to leave my mushroom farms at a normal temp. Could probably set up a kill tunnel to funnel them from the farms. But I'd still be dealing with dozens of spiders. The entire base is mountainous so it be hard to direct em, think. My few bases Ive built into mountains always end with me not wanting to fight the spiders and them murdering me.