SEER (Seasonal Energy Efficiency Ratio) measures how efficiently an air conditioner operates over a typical cooling season. It’s calculated by dividing the total cooling output (in BTUs) by the total electrical energy input (in watt-hours). A higher SEER rating indicates greater efficiency, leading to lower utility bills.
SEER2 is the updated version of this rating system. It uses more rigorous testing procedures that better reflect real-world conditions, like how your AC actually performs with ductwork and airflow resistance in a typical Edmonton home. Because of this, SEER2 ratings are slightly lower than SEER, even though the equipment performance hasn’t changed. For example, a unit with a 15.2 SEER2 rating is roughly equivalent to a 16 SEER under the old scale.
In Alberta, where summers can get hot and dry, a SEER2 rating of 14.3 or higher is generally recommended for energy efficiency and comfort. Some systems go as high as 18+ SEER2. While higher-rated systems cost more upfront, they offer better long-term savings.
