CSLB C-20 HVAC ContractorCooling and RefrigerationMedium
A contractor explains to a client that new equipment ratings use SEER2 instead of the older SEER metric. What is the primary reason the testing standard changed from SEER to SEER2?
- ASEER2 is calculated using kilowatt-hours instead of Btu per hour
- BSEER2 testing uses a higher external static pressure to better reflect real-world ductwork resistance
- CSEER2 measures only the indoor coil performance, ignoring the condensing unit
- DSEER2 eliminates the need to test at multiple outdoor temperatures
Show answer & explanationAnswer & explanation
Correct answer: B. SEER2 testing uses a higher external static pressure to better reflect real-world ductwork resistance
SEER2 testing, implemented under updated DOE test procedures (M1), uses a higher external static pressure (0.5 in. w.c. versus 0.1 in. w.c. under old SEER) to better simulate actual field ductwork conditions, resulting in ratings that are typically slightly lower than equivalent SEER numbers.
Why the other options are wrong
- A. Both SEER and SEER2 use the same fundamental Btu/watt-hour ratio methodology.
- C. SEER2 rates the complete system performance, not just the indoor coil.
- D. SEER2 still involves seasonal calculations across varying conditions, not a reduction in test temperatures.
SEER2 Testing Standard
SEER2 is an updated efficiency rating standard using a revised test procedure (M1) with higher external static pressure to better reflect real-world duct system resistance.
- Effective for equipment manufactured starting January 1, 2023
- Uses 0.5 in. w.c. static pressure vs. 0.1 in. w.c. under old SEER
- SEER2 values are typically slightly lower than equivalent SEER values
- Applies to central air conditioners and heat pumps
Memory trick: SEER2 pressure tests reality, not a lab fantasy.