JD Air (Julian) was great from the get go. My furnace is functioning better than ever. He took the time to explain why my furnace was making a loud noise. He notice there was vent in my dining room that wasn't connected to the furnace on the other side of the wall. He build a duct and connected the two. Everything else is history. I have had many people service my furnace, and not one of them noticed the vent in the wall(serving no purpose)allowing heat in the Winter, and cool air in the Summer to escape into thin air. Thank you Julian for bringing this to my attention. I am forever grateful.