Please advise. My husband and I inherited a Cape Cod home built approximately in 1950's. It is located on the lakefront in pa. We get some cold winters. The house had a old oil furnace on it. Since we did not have access to gas lines, we replaced the old oil furnace with a propane furnace last year. The roof was not ventilated. We vented the roof and installed "baffles?" along the inside of the roof rafters for air flow, followed by insulation and then drywalled the ceiling. We then rented the house out. The problem is our tenant complained that the upstairs which contains a bedroom, small open area and a bathroom is too cooled in the winter and very hot in the summer. This was echoed by my painter today who was working in the upstairs. He said it is like a oven upstairs. The thermostat for the furnace is located on the first level in the living room. My tenant also complained that she was going through propane like crazy this last winter. She recently moved out due to these problems. We have asked the furnace installer to check this problem out but so far we have not have a response. Do we need a two zone system? Do they have anything like that in a propane system? Is a space heater a possible answer for the upstairs? What is the best way to cool it down in the summer?