Thanks for the kind comments! Glad I can get in and actually do MY work in there!!
We are planning a shop warming/New Years party out there so I went and picked up one of these;
* Requires a 110v Connection
* CSA certified
* Heats approximately 1250 sq. feet
* Runs up to 14 hours on 20-lb tank (low setting)
* High temperature limit switch
* Continuous ignition
* 10' hose and regulator included
Fired it up today, outside temp was -16C/3F, had it running only 1/2 an hour and could take off my jacket. Over an extended period of time you have to crack something open for fresh air, but even though a little undersized, it worked very well.
Will have to use this for the rest of this year as the power won't be run to the building until spring. But the mezzanine build will start as soon as the party is over