We recently purchased an 1890 home that is a full two story with a brand new shingles, the previous owner had to reshingle the house in order to pass appraisal but the roofer did not add any ventilation.
There are two windows in the attic, one is boarded over and the other is a glass one, on opposite ends of the gable of the roof. I looked at the eaves and it does not look very promising to put soffit vents on the home and roof vents near the peak. The soffits are parallel to the roof rafter beams and not your more modern style in a triangular shape.
Would it be possible to just replace both windows with gable vents the same size and see how well the attic fairs this winter using the through attic ventilation or should I go ahead and install some other sort of ventilation.