Future generations will marvel at the ridiculous ways we’ve been keeping warm. With a furnace, you’re inefficiently burning toxic, planet-warming gas. In a big city like New York, your building might have a boiler that burns oil or gas to heat water or produce steam, which feeds wheezing radiators in every unit. Electric-resistance space heaters are more efficient, but even they’re not nearly efficient enough, as you’ll see in your utility bill if you run one too much.
For many decades now, there’s been a far more efficient device that climate nerds love: the heat pump. Instead of generating heat like those other techniques, it transfers warmth from outdoor air
→ Continue reading at Wired - Science