Why would you want to?
The second speed isn't that critical. I replaced our 2 speed thermostat with one like you have because the original was wildly inaccurate at best. The modern thermostat shuts the whole unit down rather than just the compressor, when it reaches the set temp. When off, it's much quieter in the trailer, and we didn't miss "high fan" at all.
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Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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