June 27, 2024 |By 4 Seasons Heating & Cooling HVAC System Types and Their Efficiency Ratings Understanding SEER, EER, and HSPF When diving into the world of HVAC systems, the acronyms SEER, EER, and HSPF are your guiding stars to energy efficiency. SEER, or Seasonal Energy Efficiency Ratio, is a measure of how efficiently your...