Background: I have had a couple cases in two different homes where my electric bill sky rocketed over $300 in a month due to issues with my HVAC system. The last time this happened I found a leak in both of my coils requiring they both be replaced (Thank you Lennox for the faulty coils!) in warranty. This summer is one year after the coils were replaced. While it appears that my AC systems are both operating normally, they tend to stay on for much longer (ecobee retains detailed data on what the system is doing) making me wonder whether there is an issue.
Goal: Automated monitoring of AC performance by measuring the air temperature on the input and output of the AC unit. I believe proper functionality is when there is a difference of 8-11C (15-20F).
Viable Sensors: Thermocouple or DS18B20 Digital temp sensor
Hardware to measure and share on ST: This is where I am looking for suggestions. I am hoping to find a Zigbee or Zwave device with two temperature probe inputs. All I have found either has an onboard sensor (not useful) or only has a single input (Qubino ZMNHID3)
If this were a stand alone system I would consider using an Arduino with an LCD but I would like something where I can pull in the data in ST easily.
Any suggestions? I am trying to avoid having to purchase Qty 4 of the Qubino device listed above given I have 2 separate systems…