Approx. Cooling Energy $avings

SEER Upgrade

Evaluation METHOD

(Adjust to $uit your $ituation)

SEER 12 vs 17 = ~71% as much energy

__5 tons

~10 hours /day

~50 kw-Hr / day

_30 days

1500 kW-Hr/ month

$0.10 $ / kW-Hr

$150.00 Monthly Cooling Cost

_______

$44.12 Savings per month at 29% (100- 71)

__5 months

$220.59 per year

If the 5-ton A/C unit runs for

10 hours each day for 150 days (30 days x 5 months),

your annual cooling cost savings would be ~$220.

It seems like A/C might be 45% to 62% of total electric bill. At 14 hours per day run time, cooling cost would be $210 per month, and

savings would be $61 per month for about 5 months (MAXimum, unless you are in Phoenix) per year.

Total annual cooling hours in the VERY Simplified Example

above is 1,500 hours

which may vary significantly due to

weather in your specific area

and A/C unit performance.

System price ~$10,000 simply to have

more efficient unit ... Pay-back 45 years.

More realistic comparison,

system price greater than the

cost of a 12 SEER replacement:

Say $3,000 is approximate cost

for upgrade from 12 to 17 SEER.

Pay-Back = 13.6 years.

Obviously, other A/C performance and building envelope enhancements should be evaluated

prior to equipment SEER upgrade by itself

as others will comment here.