I have a used Longwood Dualfuel Furnace for sale. It was used for 10 years to heat multilevel home, approximately 4400 square feet. It is a Series VII. Input gas, oil, or 24-32" wood. 15,000 BTUs. Output per 12 hour recharge 150,000 BTU. Also have some ductwork, humidifyer, A-coil. etc. that was used with the furnace. Perfect working order. Take Best Offer.