I'm of the keep it simple ilk. There's a lot of high tech in this stuff now and it can be a problem when things go wrong.
Not a furnace, but I had a new central AC installed a few years ago, the guy asked me how efficient a unit I wanted, I told him the most efficient unit you have where the repair guys have parts on their trucks. He told me I was smart and I ended up with like a 16 seer with no variable controls on it that need to be special ordered. I feel the same way about heating units.
Keep it simple.
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