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I bought an oscilating space heater from Meijer for about $40 (free to me b/c I had a gift card). You can set it for a certain temperature like climate control or you can leave it on high or low. It came w/ a remote too so if you get hot/cold in the middle of the night, you can turn it off/on.
Just go outside and spray all the spray cans you have into the air, while you car and lawnmower are running. Also, dump a bunch of gas on the ground and light it.
Should cause global warming, and you will not need the heaters.