I just finished reading your post regarding the use of multiple infrared heat lamps and I'm interested in using this approach in my shop. My shop is an old barn about the size of yours. I've been working on it for years. It is uninsulated for the most part.
If I may ask, what is the make up of your electrical circuit(s) for these lamps? Are you using a particular make and model? How many circuits did you end up with for 30 lamps? Any idea of the increased amount in your electrical bill?
It appears we are in the same climate region ( I live north of Vancouver Washington), so I think your approach could work well for me.
Thanks very much,