I had one of these in the closet for a couple of months but had never installed it.

Pulled the original mercury switch out and dropped in the new one:

I needed the 7-day programmable rather than 1 or 5+2 because I work nonstandard days and hours.  This Honeywell was ~$50 when I bought it but I think they are discontinued as the market moves to pricier touchscreen units.

I was happy with the last digital thermostat I got for my previous house.  Temps seemed more consistent and utility bills were noticeably lower.



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