The programmable thermostat for my heating and air conditioning just died. In diagnosing that it was indeed dead, I unclipped it from its base on the wall and discovered, to my chagrin, that I could have set it for 24-hour clock and Celsius. (The previous owner of the house had told me that it was 12-hour clock/Fahrenheit only.)
I replaced it with the current equivalent model and set the jumpers as I should have done on the old one. It's a Lux TX500, available at Home Depot. The old one was a Lux TX1000. I noticed that the other Lux models don't have the dual unit capability. A Google search (using Lux and thermostats as the keywords) didn't reveal the manufacturer's web site, but I now know it's http://www.luxproducts.com. (I suspect they haven't bothered to submit their URL to any of the search engines. They do have a good range of keywords on their home page.) Bill Potts, CMS Roseville, CA http://metric1.org [SI Navigator]
