Another local company told me I needed a new heat exchanger or a new furnace to correct a CO leak. I was looking at a bill of around $2000 for the repair or close to $4000 for a new furnace. I contacted Dave's for a second opinion and they were able to replace the heat exchanger under warranty (which the other company didn't tell me about) and the whole cost was only $200 plus taxes. Dave's Heating is my new furnace service company of choice in North Bay and I would recommend them to others.
Special thanks to Natasha in the office for being super knowledgeable and helpful.