Energy Performance Certificates (EPCs) are an essential tool for assessing the energy efficiency of buildings in the UK. However, one factor often overlooked in EPC calculations is the impact of air conditioning (AC) loads, particularly during the summer months. This gap can lead to underestimated energy use and misleading EPC ratings.

Why Air Conditioning Loads Matter

Most EPC assessments focus on heating requirements and insulation quality, which are critical during colder months. However, summer cooling demand can significantly affect energy consumption:

  • AC systems increase electricity usage, which may not be fully reflected in EPC calculations.

  • Buildings with high cooling demand may consume more energy than EPCs suggest, especially in urban areas with heat islands.

  • Misalignment between EPC ratings and actual summer energy use can impact utility bills and occupant comfort.

Factors Affecting Summer Energy Efficiency

  • Building Orientation and Shading: Poorly shaded south- or west-facing windows increase cooling loads.

  • Insulation Quality: Inadequate insulation allows heat ingress, increasing AC use.

  • AC System Efficiency: Older or poorly maintained systems consume more energy.

  • Occupancy Patterns: High occupancy or heavy equipment loads increase cooling demand.

Addressing the Summer Efficiency Gap

Property owners can take several measures to improve energy performance in summer months:

  • Upgrade AC Systems: Install energy-efficient, modern units to reduce electricity usage.

  • Enhance Shading and Insulation: Use blinds, reflective coatings, or roof insulation to limit heat gain.

  • Regular Maintenance: Clean and service AC systems to ensure optimal performance.

  • Consider Renewable Cooling Solutions: Solar-assisted cooling or natural ventilation can reduce reliance on AC.

Why EPC Rate?

EPC Rate provides comprehensive EPC assessments across London, ensuring that all relevant factors—including heating and cooling loads—are considered for accurate ratings:

For guidance on improving your EPC rating and understanding cooling impacts, contact EPC Rate today.