There's nothing wrong with doing it that way, but if you would prefer to save your propane, you can skip the gas and go straight to heat electric. At 42 degrees, it should work fine.
The gas heat will certainly warm up much quicker in my experience.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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