On Mon, 1 Dec 2008 19:34:23 -0800 (PST), Mikepier
wrote:


Just keep in mind most portable space heaters are 1500 watts. Which if
you do the 10W per sq foot rule should be plenty for your
requirements.

My mistake. At 500 sq ft, you need at least 5000W of heat. A 1500W
space heater is not going to cut it.

5000 will maintain the heat- but in my garage I like to go out when
the ambient is 20 and bring it to at least 50 degrees in a half hour
or so. Add a little breeze, and my 50000btu torpedo heater is
barely enough.

Jim