Above Chart is my Temperature and Humidity chart from 9-May to 28-Jun. You may notice that the humidity increase and temperature reduce after 21-May. That is when my BH Water Supply issue was solved. When there was no water supply, the average humidity was about 73%. Now is about 78%. Before, the average temperature was about 30.8degC. Now is about 30degC. So, humidifier water vapor does help to reduce the temperature by a bit.
When the chart is zoomed in, you will notice that the humidity is still fluctuating. The average different between Max and Min is about 5%. If compared to the chart taken on Dec-08, the Max and Min different is about 9%. So a drop of 4% after I off one of my ventilator which operate from 7pm to 7am.