Goldilocks & The Air Conditioner

It's summer and I live in a hot climate. Furthermore I have a penchant for sleeping during normal business hours. Accordingly I need reliable airconditioning during the day. Instead I've been getting hit & miss. I turn the air conditioner on and it's too cold, so I wake up shivering. I turn it down on fan option and it does nothing. I turn it off and it's too hot so I wake up in a sweat and more often than not a headache. This is a most frustrating state of affairs.