SEER (Seasonal Energy Efficiency Ratio)
SEER, or Seasonal Energy Efficiency Ratio, is a measure used to rate the efficiency of air conditioning units. It represents the cooling output (in BTUs) during a typical cooling season divided by the total electric energy input (in watt-hours) during the same period, providing an average efficiency over the season.
What SEER2 Means for a Home in Oklahoma
Oklahoma sits in the DOE South region, so the rules here are stricter than in much of the country. Since 1 January 2023, a new split-system air conditioner installed in Oklahoma must meet at least 14.3 SEER2 (11.7 EER2), equivalent to the old 15.0 SEER. The North region minimum is 13.4 SEER2, which means a unit that is legal to install new in Ohio is not legal to install new here. It also matters that SEER2 is tested at a higher external static pressure than the old SEER, so identical equipment reads a lower number — a "14 SEER" listing is not comparable with 14 SEER2. Rated efficiency assumes clean coils, and red-dirt dust loads condensers and filters faster here than in most climates, which is the point of an air conditioner tune-up.
On the systems we open up around Washington and McClain County, the distance between a unit's rated efficiency and what it actually delivers is usually dust and airflow — a caked condenser coil, a loaded filter, or ductwork that was never sized for the equipment — rather than the equipment itself losing capability.
If you are comparing replacement quotes and the SEER2 figures do not line up between them, our air conditioner installation page covers what we fit and pricing sets out what a typical installation costs.
What Does SEER Measure?
- Efficiency: Specifically, how many BTUs of cooling are produced for every watt-hour of electricity consumed.
- Seasonal Performance: It accounts for the performance of the system over various weather conditions, not just at a single point.
How is SEER Calculated?
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Calculation: SEER is determined by dividing the total amount of cooling (BTU) provided by the system over a typical cooling season by the total electrical energy (Wh) consumed during that period.
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Testing: Standardized tests under specific conditions to simulate real-world performance across a range of temperatures.
Importance of SEER in Choosing an Air Conditioner
- Energy Savings: Higher SEER ratings mean more efficient use of electricity, which translates to lower operating costs.
- Environmental Impact: More efficient units have a smaller carbon footprint due to reduced energy consumption.
- Compliance: New units must meet minimum efficiency standards, which since 2023 are set in SEER2 rather than SEER and differ by region. Split-system heat pumps must also meet a minimum of 7.5 HSPF2 (6.7 HSPF2 for single-package heat pumps).
Standard SEER Ratings
- Minimum Standards: Since 1 January 2023 the standard is expressed as SEER2. In the DOE South region, which includes Oklahoma, a new split-system air conditioner must meet at least 14.3 SEER2 (11.7 EER2) — the equivalent of the old 15.0 SEER. The North region minimum is 13.4 SEER2.
- High-Efficiency Models: Premium equipment rates well above the legal minimum, but compare like with like — SEER2 figures read lower than the old SEER figures for the same hardware, so a high number quoted in SEER is not the same claim as the same number quoted in SEER2.
Factors Affecting SEER Ratings
- Climate: Efficiency can vary with external temperatures; units designed for hot climates might perform differently in cooler areas.
- Installation: Proper installation, including correct sizing, can significantly impact actual SEER performance.
- Maintenance: Regular maintenance like cleaning coils and replacing filters helps maintain high efficiency.
Conclusion
The SEER rating is crucial when selecting an air conditioning system for energy efficiency and cost savings over time. While higher SEER units might have a higher initial cost, the long-term benefits in energy savings, comfort, and environmental impact make them a wise investment. Understanding SEER2 alongside other current efficiency metrics — HSPF2 for heat pump heating, AFUE for gas furnaces — can lead to better HVAC choices for your needs.