What Goes Down When The Lights Go On

I need to charge my phone, but what will it cost. For me it was $0.06, i say only a nickle and a penny is pretty good. Now It only cost $3.80 to power my house each day ( BTW that is a rough estimate). Now what would be the worst time of the week for my power bill? The answer is the weekend, because me and my dad are at the house most of the day running up the power bill. Now what month would be the worst for my power bill? I would say July, Because air conditioning cost a lot more heating and school is out so I sit around and use electronic entertainment. Now my house uses 1,140 kWh of energy each day. so that is a big number so how can I reduce that? What I come up with is having  an  automatic thermostat that could turn-down the heat/ air when you are not home.