I recently purchased a foreclosure.

I recently purchased a foreclosure. The home is only about 4 years old and in excellent condition. I'm a single man with no kids and the house is about 2400 sq ft. Obviously I don't use alot of the appliances, fixtures, HVAC, etc compared to a family. For example, the secondary bathroom doesn't get used at all, I don't run the AC and I rarely run the dishwasher. I'm wondering, how often is it necessary for me to operate everything or is it ok to keep things idle?