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I didn't see any moss. lol. Yes, more ventilation. The lower windows open will be fine as far as drafts go most of the year. Some nights in winter will need to be covered. Opening the triangles like @rosemarythyme said will be needed year round. Some flashing to block rain may also be needed...

Please state you general location, adding to your profile is even better. Climate is such an important factor in all things chicken.