I've never seen one installed in a house, so that's a new one to me. At the same time, this page (https://www.energy.gov/energysaver/heat-pump-systems/absorptio

I've never seen one installed in a house, so that's a new one to me. At the same time, this page (https://www.energy.gov/energysaver/heat-pump-systems/absorption-heat-pumps https://www.energy.gov/energysaver/heat-pump-systems/absorpt...) makes it sound that they're mostly available for industrial applications, and that residential gas heat pumps are hard to find (actually says "under development".) Also notes that "absorption coolers and heat pumps usually only make sense in homes without an electricity source."