I absolutely loved my apartments that had a heatpump and toilets with water-pressure powered engines(?), which barely used any water.

My summer electric bills (all electric appliances) were $66 in the 2020s, $130 in winter. My efficient toilet could have flushed a fucking coconut, it was so powerful that there was actually air getting sucked out of the room when you flushed it. It’s tank had no visible water, but had something that looked like a black car engine, which would blast air and water when flushed.