Air Source Heat Pump Advice & Installation Support

Thinking about an air source heat pump (ASHP)? EvoHome Improvements helps homeowners across Hampshire and the South understand whether an ASHP is realistically suitable for their home before requesting quotes. Suitability depends on insulation levels, existing emitters (radiator sizing or underfloor heating), hot water demand, available external space for the outdoor unit, noise considerations and electrical supply.

We also help homeowners think through the Boiler Upgrade Scheme and other grants — without guaranteeing eligibility, payback or running cost savings, which always depend on the property, tariff and usage. EvoHome Improvements advises and coordinates; independent vetted MCS-accredited installers carry out the physical installation and any required heat-loss assessment.

We do not quote fixed prices, exact timescales, guaranteed savings or guaranteed grant outcomes without a proper assessment. Air source heat pumps represent the UK government's primary strategy for decarbonising home heating, with a target of 600,000 installations per year by 2028. In Hampshire and across the South of England, the relatively mild climate makes air source heat pumps particularly effective — with higher seasonal performance than colder regions of the UK.

## How Heat Pumps Work in Practice An air source heat pump extracts heat from outdoor air — even at temperatures as low as -15°C — and uses a refrigerant cycle to amplify this heat for space heating and hot water. The key metric is Coefficient of Performance (COP), which measures how much heat is produced per unit of electricity consumed.

A well-installed system in Hampshire should achieve a seasonal COP of 3.0–3.5, meaning every 1kW of electricity produces 3–3.5kW of heat. ## The BUS Grant and Financial Support The Boiler Upgrade Scheme (BUS) provides a £7,500 grant towards air source heat pump installation for eligible homeowners. Combined with lower running costs compared to oil, LPG, or direct electric heating, heat pumps can deliver significant financial savings over their 15–20 year lifespan.

However, the grant requires MCS-certified installation and a properly completed Energy Performance Certificate. ## Why Specification Quality Matters Heat pump performance is entirely dependent on correct specification. This includes accurate heat loss calculations, appropriate system sizing, correctly specified radiators or underfloor heating, adequate hot water cylinder capacity, and proper commissioning.

A poorly specified system will underperform, cost more to run, and damage the reputation of a technology that — when installed correctly — is highly effective in the UK climate. ## Hampshire's Mild Climate Advantage Hampshire's average winter temperatures of 3–7°C are ideal for air source heat pump operation. COP values are highest when outdoor temperatures are mild, meaning Hampshire installations typically outperform national averages.

Coastal areas benefit from the moderating effect of the sea, with fewer…