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Install 6 heat pumps

We're considering installing 6 heat pumps in a block of flats and for the purposes of comparison I'm wanting to find out what a basic straightforward back to back installation might cost, including running the power supply from the switchboard which would be about 4 or 5 metres through the ceiling space. I realise that a firm price can not be given without a site inspection so this is just to get a ball park figure and enable me to then decide if the next step is justified. Although price is obviously important I will be looking at quality, reputation, etc, as well. Thanks!