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SEER2 Vs SEER

SEER and SEER2 use the same method of calculating energy efficiency.  The difference is the conditions under which the test is performed.  The static pressure of the airflow was 0.1 inches of water column for SEER and is 0.5 inches of water column for SEER2. The basic calculation of the BTUs of cooling divided by the energy comsumed in watts remains the same.  It simply takes more energy, at a higher static pressure, so the resulting Energy Efficiency appears to be less when using the same equipment.
The static presssure of 0.1″ w.c. isn’t a realistic number and so the people in charge of these standards decided to use a more realistic static pressure of 0.5″ w.c. to simulate the real world.  A more accurate number gives the consumer a better idea of what they are actually getting.

EER2 Vs EER

So, we’ve removed the S and now its something else.  The S stands for “Seasonal”, so when we remove it we are left with Energy Efficiency Ratio.  EER is simply the same ratio as SEER but over the entire year.  To get the added 2 in EER2 we can say the same thing as with SEER vs SEER2.  The 0.1″w.c. is now 0.5″w.c. so the energy usage is higher to acheive the same goal and give the consumer a more accurate idea of the energy efficiency of their system.

EER To EER2 Rating Chart
   0.1″ w.c.                                                     0.5″ w.c
EER Rating:                                               EER2 Rating:
6 EER                                                         5.8 EER2
7 EER                                                         6.7 EER2
8 EER                                                         7.7 EER2
9 EER                                                         8.6 EER2
10 EER                                                       9.6 EER2
11 EER                                                       10.5 EER2
12 EER                                                       11.5 EER2
13 EER                                                       12.5 EER2
14 EER                                                       13.4 EER2
15 EER                                                       14.4 EER2
16 EER                                                       15.3 EER2
17 EER                                                       16.3 EER2
18 EER                                                       17.3 EER2
19 EER                                                       18.2 EER2
20 EER                                                       19.2 EER2

SEER Rating:               SEER2 Rating:
12 SEER                      11.5 SEER2
13 SEER                      12.4 SEER2
14 SEER                      13.4 SEER2
15 SEER                      14.3 SEER2
16 SEER                      15.3 SEER2
17 SEER                      16.2 SEER2
18 SEER                      17.2 SEER2
19 SEER                      18.1 SEER2
20 SEER                      19.1 SEER2
21 SEER                      20.1 SEER2
22 SEER                      21.0 SEER2
23 SEER                      22.0 SEER2
24 SEER                      22.9 SEER2
25 SEER                      23.9 SEER2
26 SEER                      24.8 SEER2
27 SEER                      25.8 SEER2
28 SEER                      26.7 SEER2
29 SEER                      27.7 SEER2
30 SEER                      28.7 SEER2

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