how high is a fireplace mantel Inside 2012, the most recent year obtainable, a survey done by the fireplace, Patio, & Barbecue Assoc. determined that: "36 % of homeowners said their hearth or stove was a significant factor in choosing to purchase and live in their current residence. "In other words, thirty six % of those surveyed could not wait to start hauling log, cleaning up the mess, breathing in harmful airborne particulates as well as, most disturbing of all, watching 80-90% of the heat generated by simply their wood fire increase the flue. (Just to get reference, if your oil-fired air conditioner was only 20% effective it would be the equivalent of paying $23 a gallon for heating system oil at today's costs. ).