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When I replaced the roof on my previous house, a ranch, I had a ridgeline vent put in. I already had soffit vents and gable vents but the ridgeline made a huge difference. They can be installed after the fact. Turbines work, but they do take some upkeep and they're harder to install afterward. And the fewer holes in the roof you are trying to seal the better. Make sure you have PLENTY of insulation above the ceilings. Keeping the heat in the house in the winter prevents ice dams on the eaves.
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