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The 200% seasonal efficiency is a bit off, Nordic models, measured with the “colder” European climate zone, get 300%+ and have guaranteed output at -25C / -13F. Example model from Mitsubishi:
It’s worse than 5.5x or 4.3x in warmer areas but the right model air source heat pumps work fine down to pretty damned cold. Norway and Sweden have a ton of them as they spend a ton of energy on heating and this saves homeowners a ton of money every year.
Best models optimized for average climate now reach 5.5x or better in the green, moderate zone, SCOP of 4.3 is actually pretty terrible but this one is built to be ice proof.
Example latest bestest heat pump with 6+ seasonal COP:
The expected return part is the main tax on billionaires. With capital gain you can hold on forever and never get taxed, and if you die you completely skip capital gains tax with inheritance. Effective tax rate is near zero. This trick obviously only works for people who don’t need their invested money, buy and never ever sell.
Compare that to NL’s tax. Invested? You pay 6.17% x 32% = 1.97% on your investment account, immediately, no deferral possible, year after year. And the rate went up to 36% in 2024 to reduce passive income’s rate advantage over income from work.