If your power bill has "been a lot higher lately", then it's your air conditioning. Take a look at the changes that you've made lately with your power consumpt

If your power bill has "been a lot higher lately", then it's your air conditioning. Take a look at the changes that you've made lately with your power consumption, and what's gone up. Once you've narrowed it down to your air conditioning, you can do something about that problem. (Important note: The biggest use of electricity isn't always air conditioning. But after a hot summer... it's air conditioning.)