You may remember that the greenhouse has sensors connected through the Internet of School Things which upload data to the internet. It means that we can always check the greenhouse on cold nights to see that the heating is working and compare greenhouse conditions to those we have recorded in tropical forests. To check on conditions yourself follow this link http://www.iotschools.org.uk/GPRSLogbook/1004.htm and click Xivley Feed and you will see data from both the Warm Asia and Cool Asia sections (The top two feeds are temperature and relative humidity for warm Asia) . Click on the data to get a graphical plot like this: