EPC asset ratings
Split into two parts, energy and environmental, the EPC asset ratings give a visual and numerical values. The charts are colour coded and have a bar graph like appearance; next to the bar graph is an indicator of current value and potential.
First part is the energy efficiency rating coloured from red (worst) to green (best). The second part is the environmental impact rating coloured from grey (worst) to blue (best).
There is no linear relationship between EER and EIR; however, the suggested improvements indicate improvement values for the energy and environmental ratings. Using the values in different areas, helps focus on the cost and value of decisions.
The higher the number, the better the rating is. One is the worst
Energy efficiency rating (EER)
EER is the RdSAP (Reduced SAP (Standard Assessment Procedure for Energy Rating of Dwellings)) value, on domestic EPCs. The calculated is valued as a cost per metre square m2.
The graphic used, may be familiar; this is because they are now on many domestic appliances to indicate energy efficiency. This indicates a potential running cost; however; the running cost does not apply to everyone because everyone uses appliances differently.
Comparing like-for-like items enables the buyer to have a choice in what they buy. As with domestic appliances, homes may have a similar rating but used individually. With all the extra information available, the buyer is able to make a more informed choice in what they buy.
Environmental Impact CO2 Rating (EI or EIR)
EI is an emission rating of Carbon Dioxide (CO2).
Emission values can change over time because each fuel has its own emission value; the value changes because the quality of fuel used can vary, and the impact of getting the fuel changes.
The easiest way to think of this is; if you have an oil-fired boiler, you would probably get a delivery of fuel from a lorry, since the lorry has to travel to your property it uses fuel getting there.
This is the more crucial element of the EU directive, which implemented EPCs for buildings, as it is the impact on the environment that we are trying to reduce.
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