I think most of the actual furnaces or at least the key components are made by only a couple of different manufacturers. What's important is to get the right type and size of unit, installed by someone who knows what they're doing and will stand by their work. I'd recommend getting 3 quotes. I'd stay away from Sears - we had them give a quote to see how it compared to the smaller specialized firms and while they came in with the lowest cost I had pretty low confidence in what they were trying to sell us after talking to the guy.
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