You have to climb up the computer desk and turn up the thermostat on the wall. When it is in the red, the vent next to the bed blows hot air. Shove over the wastebasket and you can climb on the papers to reach the bed.
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In the room with the laptop, go to where her diary is and jump left to the AC controller in the wall. Turn it to hot. Knock over the trash can in CJ's bedroom so the trash in it will go over the air vent and be lifted by the hot air.
You push the sponge to the spray bottle. then jump onto the sponge, spray bottle, and finally the trash can. enter it.
After you have got the battery in the toy truck, back the truck up until it is close enough to the garbage can so that you can jump to the top.