central air conditioner units

What is the most efficient central air conditioner out there?
I took a look at the tag of the central air units I have at my house, and it indicated that they were to the far left of less efficient units of similar models.
My husband, (an A/C tech) says that the most efficient unit you can buy is a Lennox 21 S.E.E.R. heat pump. It depends on what part of the country you live in though. Heat pumps are more efficient in southern climates with not as much cold. Call your local Lennox dealer to help you.
Janitrol central air-conditioner at Friendly’s restaurant
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CENTRAL AIR CONDITIONER 14 – 15 SEER CONDENSER UNIT NEW $1,149.99 |
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CENTRAL AIR CONDITIONER 14 – 15 SEER CONDENSER UNIT NEW $1,149.99 |
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CONDENSER UNIT & HEAT PUMP CONDITIONER AC CENTRAL AIR $1,599.99 |
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CENTRAL AIR CONDITIONER 14 + SEER CONDENSER UNIT R4104A $1,249.99 |
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CENTRAL AIR CONDITIONER CONDENSER UNIT HEAT PUMP 5 TON $1,699.99 |