Because the roads may be icy we left at 5:40 for Libbie's 7:30 flight. The temps were above freezing so we did OK on our trip. It started raining later in the morning. Libbie's plane was on time all the way though she didn't call me to tell me this. Went to the greenhouse and met the UPS truck who had the convection tube. Installed the tube and punched the holes. It works much better with the larger tube - I seem to have more airflow. Now I need to rewire the thermostats to get back to the original configuration. Picked up my groceries today.