I know this has been discussed here before but my searching brought up nothing that made sense for my specific situation, so...
My system...propane upflow furnace w/AC, homemade outdoor boiler (online soon I hope!).
I am wanting to use a second thermostat to control the blower when the OWB is producing heat, and my existing thermostat to fire up the propane unit if the OWB fails to hold the heat up. I was planning on using a cheap programmable t-stat (probably a Honeywell) for the 2nd t-stat, but would be glad to hear any recommendations.
***Here are pics of my existing wiring at the back of the t-stat and where that wiring connects to the propane furnace. I guess the extra red and white wire at the furnace go out to the A/C compressor.*** Let me know if you need any more info, thanks.
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