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With the AC Infinity controller still not connecting to the app, I don't have real-time access to the temperature in the greenhouse. The two Elitechs are mostly wonderful but I have to plug them into the USB port on my laptop, download the data, then import it into Excel. It's a process. Lately my habit has been to check the low on a standalone thermometer (TempPro TP50) and got a bit concerned when it showed last night's low inside the greenhouse at 33 degrees. With the way my two heaters are set up, it should not dip below 40.

I downloaded the inside Elitech data and found that it got down to 39.5 inside last night with an external temperature of 18. That means the primary heater handled it and the secondary heater did not come on. This TempPro seems accurate to about 6 degrees, either high or low, which is not accurate at all. This is a device that has 153,000 reviews and a 4.6 rating on Amazon, so maybe I got a bad copy. This is not useful to me and I'm still in the Amazon return window.

I said the Elitechs are "mostly" wonderful. But sometimes they can be a pain to get started. If I hold down the start button and nothing happens, I have to plug it back into my laptop and do a reset. When I checked the outside Elitech today, apparently the restart didn't happen nine days ago and I missed all of that data. That's OK, I can get highs and lows from the National Weather Service, and it is the inside Elitech that is critical. I have thought about using the outside Elitech for other purposes, such as burying the probe in one of the planting beds to monitor variations in soil temperature over a period of time, or using it in the garage during the winter.

This is an example of an Elitech-produced graph. It is the inside data for April 13-16. When you see little squiggles as the temperature bottoms out, that is the heater cycling on and off. That is what I want to see when I look at these graphs.

The ideal situation would be to get the AC Infinity setup going again. I'll fiddle with it when it warms up, but for now the fan is still coming on at appropriate times and I don't want to mess that up.