Heat pumps outselling gas furnaces for second year

Just saw the latest numbers - heat pumps outsold gas furnaces in the US again in 2023, and it wasn't even close. This feels like one of those quiet infrastructure shifts that could reshape how we heat buildings, but I'm curious what's actually driving it beyond the federal tax credits.

The efficiency physics are compelling - modern heat pumps hit 300-400% efficiency even at freezing temps, versus gas furnaces maxing out around 95%. When you're pulling 3-4 units of heat from outdoor air for every unit of electricity, the economics flip hard, especially with cheap renewables driving down grid prices.

The physics here is fascinating - heat pumps hit 100%+ efficiency in most US climates now, while gas furnaces cap out at 95%. When you're pulling ambient heat from 40°F air instead of burning fuel, thermodynamics heavily favors the electric option, especially as the grid gets cleaner.