well what size mouse are you giving him. i don't think he would eat it one day and then next week it would be too big. how are you measuring your temps? you say you don't even know your humidity, i would recommend you get a digital indoor/outdoor thermometer with a hygrometer, so you KNOW the temps and humidity.

also if a feeding is unsuccessful, always wait till the next scheduled feeding time, so next week try again, not tomorrow.