Air Conditioner Efficiency

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Air Conditioner Efficiency
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Air Conditioner Problem
Suppose an older home in San Antonio is equipped
with a central air-conditioning unit with SEER
rating equal to 6 and that this home consumes
36,000 kWh of electrical power each year to power
this system. Suppose this system is replaced by a
central unit with a SEER rating equal to 18.
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1.  How much energy (in kWh) is consumed annually
by the central A/C unit after the upgrade?

• Energy Consumed
• 36,000 kWh Old SEER / New SEER
• 36,000 kWh 6 /18
• 36,000 kWh 1 /3
• 12,000 kWh

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2.  How much energy is saved annually by
switching to the A/C unit with the higher SEER
rating?

• Energy Saved
• 36,000 kWh 12,000 kWh
• 24,000 kWh

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3.  How much money is saved annually, assuming
that the cost of electricity equals 0.10/kWh?

• Money Saved
• 24,000 kWh 0.10/kWh
• 2,400

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4.  What is the payback period if the cost of
purchasing and installing the new A/C unit equals
4,800?

• Cost 4,800
• Savings 2,400/year
• Payback Cost / Savings
• 2 years