Does anyone heat with one in Northern California? I have been looking at the Lopi Freedom insert. Just went to a few local dealers. Apparently, they run about 4.1k for a unit installed with stainless steel sectional liners, not a flex liner. They told me it would cost more. And one of the dealers told me you don't need to have your chimney swept prior to doing install. That made me worried since flue temperatures can reach 600°+. Can't that ignite any residual creosote still left in the flue? Plus, I think they quoted me for single walled pipe. Can someone give me some advice?