Air source heat pumps have a sound pressure level of approx. 50Dba at 1meter, this is equivalent to the sound of an average dishwasher or a light conversation. From the outside, air source heat pumps are generally no louder than average background noise and unless sited near an open bedroom window cannot be heard from indoors.

Not necessarily, it's all about getting the radiators right. A well designed underfloor, or installing oversized radiators in an uninsulated property will work just as efficient as a new build. Alternatively, high temperature heat pumps are ideal to heat older properties.

Air source heat pumps use the ambient outdoor temperature to collect heat, there is little value in putting them in a sunny location and it is more important to keep them out of the prevailing wind.
Air source heat pumps are generally sited on the outside wall of a house as near as practicable to the pipework for the central heating/ hot water system.

It depends on the heating system, some houses have radiators and pipework that has been oversized for their existing system and we can retrofit to this with little upgrading, other houses have smaller pipework such as microbore and single panel radiators- in theses cases there may be some upgrading work required on the heating system.
In most cases the hot water cylinder will require replacing to a heat pump compatible type.

It is recommended by manufacturers that the heat pump system is maintained annually and Bi-annually for larger commercial systems. This maintenance schedule consists of glycol top ups, filter changing, checking pressures, checking controls and settings, and cleaning of various parts of the system. Hafod Renewables have a ‘Hafod Care’ plan which covers the heat pump and downstream equipment such as the pressurised hot water cylinder.

Yes, the boiler upgrade scheme grant provides a subsidy of £5000 towards the installation costs of an air source heat pump. Air source installations also attract zero rated VAT (both schemes are time limited).