I have a 'programable' wall mounted thermostat that I don't program. Matter of fact I don't set the clock on it so that the time flashes. By leaving the clock flashing that grabs my attention as I walk past, causing me to take a quick glance at the battery meter. The battery meter only shows when the (4) triple a batteries get weak about every 90 days or so.Today, I noticed that the low battery icon was blinking on my air conditioning thermostat. I swapped in a new pair of batteries. Fortunately I have a small stockpile of AA batteries.
If the AC went out because the power to the thermostat died, that would be really bad.
View attachment 29988