A very long ago friend of mine, Kemp Curtis, sculpts in glass. He is on Facebook where I've caught up with him recently. He learned at Disneyland and went on to be an artist who makes beautiful glass objects. He pays the rent with more mundane nick nacks. I think from watching a local man who does glass blowing that the risk of fire, of burning yourself, and shattering glass would be the main risks. I know the local man has several natural gas fired furnaces, which run at about 2,000 degrees. His shop is in a wood and steel, open shed. No problem heating it during winter. What kinds of things are you making?