Personally, I would like to know how often my chiller is running and for how long to monitor energy consumption and heat issues. I can tell with the temp rises based on a temp graph, but do not know if levels off on its own or if the chiller stepped in to correct it. The data would let me know if I have a real heat issue as opposed to the chiller only coming on once or twice a day for a few mintues. Also, there is really no way for me to monitor if the steps I am taking to control heat are working unless I know wheher or not the chiller is coming on and how often.
I think a function that would track total "on" time per day would be sufficient. What would really be nice, but I do not know if it is possible, if there was a way to indicate on the tempertaure graph when teh chiller came on and went off.