As energy efficiency regulations tighten, many homeowners and landlords are turning to heat pumps to reduce energy consumption and improve EPC (Energy Performance Certificate) ratings. But not all heat pumps are created equal, and the type you choose — air source (ASHP) or ground source (GSHP) — can affect your EPC assessment in different ways.
At Urgent EPC, we help property owners understand how these systems impact EPC scores and provide guidance on optimising performance.
Understanding Heat Pumps
Heat pumps extract heat from the environment and transfer it indoors for space heating or hot water.
Air Source Heat Pumps (ASHP): Extract heat from the air outside. Easier to install, less expensive, and suitable for most properties.
Ground Source Heat Pumps (GSHP): Extract heat from the ground via buried pipes. More expensive but highly efficient and stable across seasons.
Both systems are considered renewable technologies under EPC methodology, but their efficiency and impact on EPC scores can vary depending on installation and property characteristics.
How Heat Pumps Affect EPC Ratings
Energy Efficiency
EPC assessments consider the energy required to heat and power the property. Heat pumps have a high coefficient of performance (COP), meaning they deliver more heat energy than the electricity they consume. Correctly sized and installed heat pumps can significantly improve EPC ratings.Impact of System Type
ASHP: Efficiency can fluctuate with outdoor air temperature. Cold climates or poorly insulated homes may reduce the benefit.
GSHP: Provides more consistent performance year-round, often resulting in better EPC improvement, especially in properties with large heating demands.
Integration with Existing Systems
EPC assessors account for the interaction between heat pumps and other heating elements, such as radiators or underfloor heating. Proper integration ensures maximum efficiency and better EPC scores.Renewable Energy Incentives
EPC assessments recognise renewable heat sources. Both ASHPs and GSHPs can contribute positively to your rating, particularly when used with low-temperature heating systems and adequate insulation.
Installation Considerations for EPC Success
Correct Sizing: Oversized or undersized units can reduce efficiency.
High-Performance Radiators or Underfloor Heating: Low-temperature systems maximise the efficiency of heat pumps.
Building Fabric Upgrades: Ensure walls, floors, and roofs are well insulated to support the system’s efficiency.
Professional Installation and Documentation: EPC assessors require verification of installation and performance to award credit for renewable systems.
ASHP vs. GSHP: Which Is Better for EPC Ratings?
| Feature | Air Source Heat Pump (ASHP) | Ground Source Heat Pump (GSHP) |
|---|---|---|
| Installation Cost | Lower | Higher |
| Efficiency | Good, but variable with air temperature | High and stable year-round |
| Space Requirements | Small outdoor unit | Requires land for ground loops |
| EPC Impact | Moderate to high if integrated well | High if integrated well |
| Ideal For | Most residential properties | Properties with space for ground loops or higher energy demands |
Why Choose Urgent EPC
We offer fast Residential EPC and Same-Day EPC assessments.
Our assessors understand how heat pumps affect EPC calculations.
We provide guidance on improvements to maximise energy efficiency and EPC scores.
Transparent pricing and expert support for homeowners and landlords.
Conclusion
Air source and ground source heat pumps can both enhance EPC ratings, but their impact depends on proper sizing, installation, and integration with your property’s heating system and insulation. Choosing the right system and getting expert advice ensures that your home benefits from improved energy efficiency, lower running costs, and higher EPC performance.
📌 For professional EPC assessments and advice on optimising heat pump systems, contact Urgent EPC today.
