Advent of heat pumps can lead to increase use more areas using air conditioning.

Map I found from a few places online. Darker areas need more air conditioning.

I'd add that increasing use of heat pumps for heating will increase use of air conditioning in cooler cities such as Seattle and Bellingham as air conditioning is an easy add with heat pump technology.

Heat pumps are good, but they may add their own increase in use of air conditioning beyond the increase due only to climate change.

This can effect estimates as to who is likely to get air conditioning in future years and how much energy savings heat pumps will provide.