HVAC & Refrigeration

Intermediate

Seasonal Energy Efficiency (SEER)

Cooling output over a season divided by electrical energy used.

Formula

SEER = \frac{\text{annual BTU}}{\text{annual Wh}}

Variables

SEERSeasonal efficiency

BTUSeasonal cooling

WhSeasonal energy

Example

9×10⁶ BTU / 6×10⁵ Wh: SEER = 15

Did You Know?

Modern high-efficiency units reach SEER 20+, roughly double the old minimum standard.

hvac seer efficiency

Share this formula

More in HVAC & Refrigeration

Sensible Heat Load

Heat needed to change air or water temperature without a phase change.

Latent Heat Load

Heat absorbed or released when moisture condenses or evaporates — the hidden load air conditioners fight.

Coefficient of Performance (Cooling)

Cooling delivered per unit of work input — higher is more efficient.

Energy Efficiency Ratio (EER)

Cooling capacity in BTU/h per watt of power — a common AC rating.

Refrigeration Tons

Cooling capacity in tons, where one ton removes 12,000 BTU/h.

Airflow (Sensible)

Air volume flow needed to carry a sensible heat load (imperial units).