Natural gas powered heat pumps actually exist, and are commercially available, although rare in North America. Most use an ammonia absorption cycle. Efficienc

Natural gas powered heat pumps actually exist, and are commercially available, although rare in North America. Most use an ammonia absorption cycle. Efficiency is lower than one might be hoping, quite a bit less than 2x. Here's a Canadian study evaluating one: https://sustainabletechnologies.ca/home/heating-and-cooling/evaluation-of-a-gas-absorption-heat-pump-archetype-house-vaughan/ https://sustainabletechnologies.ca/home/heating-and-cooling/....