BAM has used a helicopter to install 15 air source heat pumps on the upper levels of Broadgate Tower in London.
The usual lifting techniques would have been too disruptive in the busy area around Liverpool Street Station.
The 34-storey office tower was built in 2008 on steelwork above the station.
The contractor was appointed last March to carry out a £100m green refurbishment for client British Land.
Heat pumps will help the scheme reach its targeted BREEAM Outstanding, alongside an EPC A rating.
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