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A modern heat pump will probbly supply enough heat without need for backup heat at those low temps.
A conventional system will require a separate heat source.
Going from heat pump to conventional may require additional costs to put in the heating system (if it doesn't have one)
Check SEER between the two.
3 years ago I replaced a conventional system with a new conventional system. 20 SEER with natural gas heat. Cost me a small fortune though my monthly electric and gas bills are extremely low.
My guess is that you will stick with heat pump.
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Southwest Oklahoma
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