Reply To: Looking at fitting an air source heat pump heat pump April 9, 2024 at 8:35 pm #272368 BrydoParticipantAbout 80 m2 on two levels, so 160 m2. This reply was modified 2 years ago by Brydo.The only person who got all his work done by Friday was Robinson Crusoe. Anything i post over three lines long please assume it is an article lol.