When it comes to the size of an air conditioner in a house, the “Goldilocks Rule” applies: you don’t want an air conditioner that’s too small or too large, but one that’s just right. Finding the right size of air conditioner is a tricky job, however, and it’s not something you want to make a guess at. You must have skilled professionals handle the job of sizing a new central air conditioning installation so you don’t end up with either an AC that can’t keep your home cool enough or an AC that drains energy because it’s too powerful.