You can't really see it here, but there is ventilation under the soffits. Enough to vent, but not too much for our cold winters.The windows all prop open for warmer months.
Even in extreme cold, you really can't have too much ventilation, you just want to avoid drafts... It's the lack of ventilation that causes exponentially more health issues then cold temps for most breeds of chicken...
You should have about 1 square foot of permanent ventilation per bird, so in your case about 6 sqft of vents, the soffits don't appear anywhere near that amount of area...
You might want to consider some roof jack vents or possibly a dormer style or cupola style vent for the roof...
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