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. (British Thermal Units, when discussing cooling, is the amount of heat energy that can be removed from the home by the cooling system.) The equipment takes more energy to cool the same space, 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.

SEER = Total cooling output (BTUs) / Total electric energy input (watt-hours) with .1 inches of water column of static pressure.

SEER2 = Total cooling output (BTUs) / Total electric energy input (watt-hours) with .5 inches of water column of static pressure.
Static pressure in an HVAC systems is the measurement of how much resistance there is to airflow in the ducts and other components.

.1 inches of water column is a very low and unrealistic static pressure.
.5 inches of water column is a more realistic measure of static pressure.
As you can see, they are measuring the amount of energy consumed at a higher resistance to air flow as compared to the final product (BTUs of Cooling)

The point that we are trying to get across is that the more accurate number, (SEER2), 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 achieve 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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