Another heat pump question

iplogger1

I've already posted a variation on this query to the Green forum
but I've not seen any responses.

Someone told me recently they had heard an "expert" on BBC state
that people would be mad not to consider ground source heat pumps
on account of the predicted average temperature increases (2-3degrees
or more) resulting from climate change.
Assuming the climate change is a given is it over simplistic or not to
assume that heat pump efficiencies will increase as average ground
temperatures rise ?

It seemed a perverse argument - .. i.e cash in on global warming by
getting more heat from the ground.

I would have felt that the increasing temps would mean less space
heating requirements and in some cases more need to cool houses
in summer (which would suddenly give a more persuasive argument
for heat pumps which run in reverse during hot weather .. to cool
houses). The argument about the ground temps being higher seems
over-simplistic to me. Is it ?

~ipl