What furnace is this?
When you say hole in the wall, you mean the normal heating/cooling registers?Is there a cold/cool draft coming out of the hole in the wall.
This makes more sense haha. I'll check after work today.The hole where the thermostat wire penetrates the wall.
If I follow correctly, 24 VAC should be seen between the heating call wire (W) and the common wire (C) at the furnace control panel when the heat is running. When the flame cuts off when first reaching target temp, this should show no voltage while the fan continues to run. But then when it reignites, 24 VAC should be seen again. If this is the case and the heating call properly follows the furnace flame, this is a strong indicator of something funky happening at the thermostat, not at the furnace?Also check for a drop in the heating call with your meter at the furnace.
So it’s definitely cool air in the tstat hole, but not necessarily drafty. Although this interior wall cavity runs down into a return duct, so it’s possible that when the fan is running, it is pulling air through there.Drafts affecting thermostats are fairly common.
As far as everything else, only further diagnostics will show what’s going on.
I’d have to agree. After first getting it, the Smart learning, home/away detection, and some other features sounded cool. Then started to realize how unreliable they were. At this point I only use the WiFi temp control and normal weekly scheduling.You’d be much better off without the Nest.
Although labeled as “smart”, it’s about as dumb as a brick and equally as reliable.
A lot of companies don’t want to warranty the equipment when a Nest is used, due to the issues they cause.