On Wed. evening Company 20 was holding their monthly meeting when Structure 20-3 was sounded for odor of smoke in the house. ET204, E201, RS20, A209 and the Chief (Elden) responded. ET204 went on scene with nothing evident. Chief 20 arrived and established command. Crews found a lite haze and Oder in the residence. After investigating crews found a malfunctioning furnace and held Co. 20 units only.