1. Avatar Andy Holt says:

    I came into the industry in 1978 right in the middle of adding spark ignition kits and vent dampers to older furnaces. Seems like yesterday. Enjoyed the history lesson and the explanations of changes that have been made over the years to increase efficiency, comfort and safety. Great show!

    1. Avatar Gary L Reecher says:

      What a history lesson on hot air heating. Like a steam / hot water heating lesson from Dan Holohan.

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