I must admit I haven't done a thorough search on this topic, so it may have been done by one or more others. I personally hate old analog thermostats, and I see the 166FBS I'm getting has one. It has been 15 years since the last time I had a Suburban where the thermostat wasn't integrated with a digital for the cooling. At that time I replaced with a Hunter 42999b at Walmart for about 12 bucks. Today that product appears to have become the Supco 43054 available at Amazon for $34
https://www.amazon.com/dp/B004OM5R9O
Suburban's use a simple on/off design with two wires. Units like the one referenced above have 2 AA batteries (about one year of life) to power the display, and while they have fan and cooling operations only heat is used in this application.
They have a "span" of 2 degrees from the factory, so for example setting 70 the heater will come on at 69 and go off at 71. They can be set to two other spans if desired, 1 degree (frequent cycling) and 3 degrees (less frequent cycling).
Image below is of a Hunter I installed in 2013 on a coach which had analog thermostats for a baseboard heater.
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2022 Jay Feather Micro 166FBS
2019 F150 SuperCrew Short Bed 2.7L
Andersen WDH, 1000 lb Sumo Springs
Past: 2015 Winnebago View, 2004 Blue Bird M380, 1990 Blue Bird WB40, 2003 Safari Zanzibar, 1998 Safari Sahara