A Touch of Class recommended the new fireplace be installed using existing chimney - use B-vent. Very cold air flowed into the family room like a window was half open. They recommendeded the owner to install different types of insulation around the gas fireplace insert; and owner listened to them six times. Still cold air making the room only 10 degrees Celcius. They complained that the house was too air tight (which contradicts to our updated Ecoenergy report). Eventually, owner still had to pay them and the mantel guy $1200 extra to get a direct vent insert. A total of 20 months of negotiation and owner lost $1500, time, plus high energy winter bills for 2 winters.