So I live in the Chicago area and although it has not really been that cold here (yet) ( thank global-warming if you are a sadist!) I was concerned about my garage located Glowforge getting too cold. I found a helpful thread here and purchased a flatbed grow-heater to insert inside the Glowforge under the laser tube. Set the temp to about 70 degrees and it seem to stay warm.
However, I had know way to detect the temperature remotely until I found a nice Canadian company that makes TEMPY. TEMPY is a remote environmental sensor that I added its gateway to my network.
Once set I placed the small sensor box inside the Glowforge. Then set a warning to alert my phone if the temperature reaches below 60 degrees.
I can get a environmental reading on my phone or PC that TEMPY takes every few minutes that includes temperature of course, and humility, dew-point and atmospheric pressure.
Also I get a warning should the temperature in the Glowforge reach below 60.
You can buy 2 to 5 sensors from the site or Amazon too.