What is Energy Efficiency Rating?

Flicking on the AC or cranking up the heat feels amazing. But that blissful comfort can come at a cost–a hefty one reflected on your next energy bill. Thankfully, there’s a way to be kind to your wallet and the planet: understanding energy efficiency ratings.

Think of these ratings as your secret weapon to decrease energy bills and become an eco-warrior. This guide will unpack two key concepts: Energy Efficiency Ratio (EER) for appliances and Energy Performance Certificates (EPCs) for buildings.

Understanding the Energy Efficiency Ratio (EER):

The EER is a metric used specifically for air conditioners. It measures how efficiently a unit converts electrical energy into cooling power. A higher EER signifies a more efficient system, translating to lower running costs. For instance, an AC with an EER of 12 will deliver 12 BTUs (British Thermal Units) of cooling for every watt of electricity consumed.

What is EPC in Energy?

An Energy Performance Certificate (EPC) acts as a report card for your building’s energy efficiency. It provides valuable insights into how much energy your home or commercial space consumes, its environmental impact, and potential areas for improvement.

Energy Performance Certificates Explained:

An EPC provides valuable insights into a building’s energy consumption and potential for improvement. It includes:

Current Energy Efficiency Rating:

This is the star of the show, displayed as a letter grade (A-G). It reflects the overall energy performance of your building based on factors like:

  • Building envelope: This refers to the physical barrier separating the conditioned interior from the outside environment, including walls, windows, doors, and roofs. A well-sealed and insulated envelope minimizes heat loss or gain, improving efficiency.
  • Heating and cooling systems: The type and efficiency of your heating, ventilation, and air conditioning (HVAC) system significantly impacts energy use. Modern, high-efficiency systems will contribute to a better rating.
  • Hot water systems: Similar to HVAC, the efficiency of your water heater plays a role.
  • Renewable energy sources: If your building utilizes solar panels, wind turbines, or other renewable energy sources, the EPC will take that into account, potentially boosting your rating.

Estimated Energy Costs:

This section gives you an idea of your annual energy expenditure based on your current usage patterns. It helps visualize the financial implications of your building’s energy efficiency.

Potential Energy Rating:

This exciting part showcases the achievable energy grade for your building if you implement the recommended improvements. It essentially shows the potential for cost savings and environmental benefits.

Recommendations for Enhancement:

The EPC doesn’t just point out inefficiencies; it offers solutions! This section proposes cost-effective upgrades you can consider, such as:

  • Upgrading insulation in walls, roof, and windows
  • Replacing old, inefficient appliances with newer, energy-star rated models
  • Installing a high-efficiency furnace or boiler
  • Implementing solar panels or other renewable energy sources

finding an energy performance certificate:


Obtaining an EPC is straightforward. You’ll need a qualified energy assessor, similar to getting a home inspection. Here’s how to find one:

  • Government Websites: Many government websites maintain lists of accredited assessors in your area.
  • Professional Associations: Energy assessment associations often have directories of their members.
  • Online Directories: Several online platforms list qualified assessors based on location and qualifications.

Why are EPCs Mandatory?

Transparency is key. Just like knowing a car’s fuel efficiency helps you estimate gas costs, an EPC informs potential buyers or renters about a building’s energy consumption. This translates to:

  • Informed Decision: Imagine buying a beautiful house with terrible insulation, leading to sky-high energy bills. An EPC helps avoid such surprises.
  • Fair Market Value: A good EPC rating (A or B) can be a selling point, potentially fetching a higher price. Conversely, a poor rating (F or G) might lower the value or make it harder to rent.
  • Environmental Impact: By highlighting energy efficiency, EPCs encourage people to choose greener buildings, ultimately reducing overall energy consumption and greenhouse gas emissions.

Read More: What are the Grant for UK Homes?

Understanding Energy Performance Certificates Bands:

The EPC rating system employs a simple letter grading system, with A signifying the most energy-efficient and G indicating the least efficient. Here’s a breakdown of the common EPC bands:

  • A & B: Highly energy-efficient buildings with low running costs.
  • C: Reasonably efficient buildings with moderate energy consumption.
  • D: Buildings with average efficiency, potentially benefitting from improvements.
  • E & F: Less efficient buildings that could see significant cost savings with upgrades.
  • G: Inefficient buildings requiring substantial work to achieve better energy performance.

The EPC Rating Scale can be decoded as follows:

A 92 plus points
B 81-91 points
C 69-90 points
D 55-68 points (Average rating for properties in England and Wales)
E 39-54 points
F 21-38 points
G 1-20 points

Increase Your EPC Rating with S6Energy

Why are EPCs Mandatory

Worried about your building’s energy performance? Wondering how much you could be saving on energy bills? S6Energy is here to help! We offer a completely free service to assess your building’s energy efficiency and unlock its hidden potential.

Here’s what sets S6Energy apart:

  • Free EPC Rating: Forget extra fees! We’ll provide a comprehensive Energy Performance Certificate (EPC) at no cost, giving you a clear picture of your building’s current energy usage.
  • Boost Your Rating for Free: We don’t just stop at the rating. Our team of experts will analyze your EPC and identify actionable steps you can take to improve your building’s energy efficiency–all without any additional charges.

Read More: What are the Grant for UK Homes?

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