Johnson controls has a sensor default which will display a sensor failure on the LCD. In the event of a sensor break or short you can set the thermostat to cut off the heat source. They have a better relay inside on the circuit board. And they have a feature that can be used to control a true night time drop. In my opinion, the only way they are the same is that both are On/Off, both are LCD, both control either heating or cooling equipment. I am only speaking from experience in working in the HVAC field for several years. I have seen more problems with Ranco than with Johnson Control.
Thanks,
Wil Combs

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• Thermostat - CodyNolen, Mon Mar 6 02:27:51 2006
• RE: Thermostat - kylescott, Mon Mar 6 04:05:51 2006
• RE: Thermostat - glkherp, Mon Mar 6 06:57:57 2006
• RE: Thermostat - jarskie, Mon Mar 6 08:55:57 2006
• oh, under a $100 too... n/p - jarskie, Mon Mar 6 08:56:26 2006
• RE: Thermostat - mingdurga, Mon Mar 6 09:09:13 2006
• RE: Thermostat - reptilian74, Mon Mar 6 09:58:40 2006
• RE: Thermostat - jarskie, Mon Mar 6 15:54:28 2006
• RE: Thermostat - reptilian74, Mon Mar 6 17:16:48 2006
• RE: Thermostat - jarskie, Mon Mar 6 18:14:18 2006
• RE: Thermostat - reptilian74, Mon Mar 6 19:20:57 2006
• Useful information, much appreciated np - RoyalVariations-, Mon Mar 6 19:51:05 2006
• Johnson Temp Differential - LKirkland, Tue Mar 7 01:43:50 2006
• RE: Johnson Temp Differential - reptilian74, Tue Mar 7 16:23:31 2006
• RE: Thermostat - normal_bp, Mon Mar 6 10:41:23 2006
• RE: Thermostat - wftright, Mon Mar 6 21:27:22 2006