Careful with the negative ion generators. They produce ozone which is poisonous. For your window, get a rectangular piece of cardboard or wood, cut out a circle to match the diameter of your pipe an stick it through. This will help with the cold air. However, you are going to face serious issues once this thing goes full flower. Get a proper filter, not an odor soak. I grow LED and love them. They are slower than HPS by 1 - 2 weeks mostly at the ripening stage in the last two weeks. That said, they do a great job all the way through flower.