National Museum Wales will also eliminate deliveries of oil and LPG to its more remote sites, benefitting from greater energy security after making the switch to ASHPs.
Bydd Amgueddfa Genedlaethol Cymru hefyd yn dileu cyflenwadau olew a LPG i'w safleoedd mwy anghysbell, gan elwa o fwy o ddiogelwch ynni ar ôl newid i bympiau gwres o’r aer.