Answer:
A HEAT PUMP, AIR TO AIR OR GEO-THERMAL, WILL OUT PERFORM (ENERGY USE), A CONVENTIONAL SYSTEM FROM 3:1 UP TO 7:1.
SIMPLE MATH= FROM $300 TO $700 A MONTH (ENERGY BILL) WILL NOW COST $100.
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Heat pumps are definitely more efficient as they make use of lesser energy to perform well. More importantly it makes use of existing energy out there.