You really need to be heating the objects with infrared heat and not wasting energy heating the air with blown air heaters.
below is a quote taken from Quote taken from - http://www.ehow.com/about_5348342_infrared-versus-quartz-ceramic-heaters.html
Infrared space heaters for the home emit long-wave infrared radiation, which strikes a solid nearby object and converts that radiation into heat. Infrared is not absorbed by the air through which it travels. With infrared heating, the warmth is directed and concentrated where it is really needed, so infrared heaters are better at targeted or focused heating. Infrared heaters are energy efficient, have no moving parts, heat very quickly, are silent, and are unaffected by drafts.
If you are sitting in one spot for a length of time, an infrared heater aimed in your direction will be a good choice.