Choosing the right air conditioning or heat pump isn’t just about upfront cost—efficiency plays a key role in running costs, environmental impact, and compliance with UK energy standards. In this guide, we’ll explain EPC, SEER, and COP, what they mean, and how to use them to make smart choices.
What is EPC, SEER & COP?
- EPC (Energy Performance Certificate): Ranges from A (very efficient) to G. Reflects whole-building energy use.
- SEER (Seasonal Energy Efficiency Ratio): Measures cooling efficiency over a season—higher is better.
- COP (Coefficient of Performance): Measures heating output per unit of electricity—valid for heat pumps.
Why Efficiency Matters
- Lower running costs: Efficient units use less power over time.
- Environmental impact: Better ratings = lower CO₂ emissions.
- Future proofing: More homes are required to hit EPC targets—help buyers and landlords plan ahead.
How to Compare Models
|
Spec |
What to Look For |
Example |
|
SEER |
6 (SEER 6 = A rating) |
Samsung SEER 10 = excellent |
|
COP |
≥3–4 at 7°C outdoor temp |
LG Therma V COP 4.9 |
|
EPC Impact |
Helps buildings stay compliant |
Upgrading from D to B saves costs |
Tips for Best Results
- Match unit size to room: Oversizing reduces efficiency; under sizing strains capacity.
- Look for latest refrigerants (e.g. R32): Lower GWP and better efficiency.
- Install & maintain properly: Optimal airflow and PPM plans ensure peak performance.
Why It Matters
Understanding these metrics helps homeowners choose the most cost-effective and eco-conscious solutions, and ensures installers meet energy compliance needs.