The appraiser is going to be at your house in about 20 minutes, and you're already running around like a crazy person. So is it really important to get the dirty laundry out of the overstuffed hampers and sweep up all the dog hair and dust bunnies? Yes, yes, yes! True, your home is appraised based on the square footage, number of rooms and amount of land, so technically, your housekeeping skills don't count. But appraisers are human, and they're bound to be influenced by a big mess. Being valued at the top of the range versus the bottom could be the difference in making the sale.