My ventrata and miranda have not made an pitchers ever since i moved them inside for the winter. To counter act the 40% humidity i bought a bunch of shelving, wrapped some plastic sheeting around it to keep humidity high and stuck a humidifier on the bottom shelf and my plants above it. Since the humidity in my house is very low, i have to keep the plastic covers on but that restricts airflow. What are the consequences of lack of air circulation?