On Mar 21, 3:24 pm, (David Combs) wrote:
Or do they have their own ****ty ones, made by name
brands but expressly for HD?

If HD is bad, then where?

Thanks!

David

For programmable thermostats, the difference is probably very very
small. The thermometer in most is probably a simple piece of Chinese
silicon. Add an integrated circuit, and voila. A perfectly good piece
of electronics. Lifetime: about as long as any other lump of
integrated circuitry with no moving parts, which is to say about
forever.

Maybe in the past there was a difference in the metallurgy of the
mercury-driven spring coil, but all that variation and cost has been
engineered out.