I am putting temperature sensors in the registers so I can gauge the delta between the return temp and supply temp. I want to alarm if the delta is not great enough. The problem is that I need the following to happen:
- Must determine when the thermostat is calling for heat/cool
- Wait 5 minutes and take a reading on the supply temp sensor
- Calculate the delta between supply and return temp and notify if the delta is under some amount I determine.
I don’t think I am going to be able to do this without coding, but wanted to see if you had ideas.