The installation process has a significant impact on the lifespan and effectiveness of your new air heat pump. It's not as simple as disconnecting old wires, putting in a new one and reattaching the connections; you want to make sure your new heating system is installed properly, with all necessary checks carried out, and that it will work reliably for years. Read on to find out what goes into an in-depth heat pump installation, so you can pick an installer that will do a great job.

Before a new heat pump is installed, the installer will visit your home for an inspection and assessment. This is to ensure that the ASHP is right for your home and that it will provide the energy efficiency you need. This can be arranged at a mutually convenient time and often doesn't take very long.

During the inspection, the contractor will look for any potential issues that could be addressed during the installation process. This could include anything from a lack of access to the space where the outdoor unit is going to be placed (for split systems) to ductwork that needs repairing or insulation.

They will also check that the home is suitable for an air heat pump, ensuring there's enough space for the outdoor unit and an internal hot water cylinder. If there isn't, the installer will need to install an additional space, which usually means drilling a hole in the wall for the cylinder.

After the inspection, the installer will start preparing the site for the heat pump's installation. This will involve installing a concrete base, if the outdoor unit is a large model, or creating a flat roof to house it if the size of the indoor unit allows for it. It's important that the ASHP is situated on level ground to avoid any water ingress or drainage problems. It's also best if the location is protected from direct sunlight, as this can affect its operation.

When the outdoor unit is in place, the installer will connect it to the indoor air handler by running copper piping. This will transport refrigerant and drain the condensate, both of which are required for your heat pump to function. The installer will also need to connect the low-voltage control wire, which sends a signal to the ASHP when it is time to cycle.

The next step is to install the evaporator coils, either cased or uncased depending on your system. The installer will also fit the fan motor and any ancillary equipment such as controls. They will then run a high-voltage wire between the indoor air handler and the outdoor unit, connecting them with the refrigerant and electrical lines.

The final steps are to install the heat distributors, which are either radiators or underfloor heating if you're using that system. They will be connected to the heat pump with a hose that carries water from the cylinder, and they'll also link up any other pipework such as hot water and central heating systems if you have them. Finally, the installer will carry out a quality test to ensure everything is working perfectly.