[fallingfrog]

The thermostats in my house date to 1920 when the house was new, and they work just fine. Doesn't sound like the ones in this house will last that long.

(Of course mine each have little glass bulb half full of mercury in them, but that's a separate issue).

Edit: now that I look at them they might not be quite that old, but several decades anyway. Still theyre delightfully simple, there is a single wheel that you rotate clockwise or counter clockwise and that's it. Not a single button on them.