Tiffany, I t sounds like a space heater may be your best bet in this case. Also, if you are concerned about the air vent blowing on you tanks you can try taking a piece of cardboard and kind of folding it into a squared U shape and thumb tacking it over the vent so tha it re-directs the airflow away from the tanks.
Brandon, When I first moved into my house I had the same problem with the garage being cold. I happened to find a garage door insulation kit at my local home improvement store. It was basically thin, precut sheets of polystyrene insulation, some sheet metal screws and some large flat washers to go under the screw heads. All I had to do was cut the hinge notches and trim the legnths to fit the door sections. It took me about 2 hours to completely finish it. This was several years ago so I'm not even sure if they still make the kits. If not, you could still just buy the individual sheets of insulation, screws and washers and just cut the stuff yourself...
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