Yes, I had written it all and tried to keep it simple.

It's also noteworthy that fire was used for heat for many thousands of years.

Boiling water with fire was used for heat before electricity even existed. So boilers could work in apartment buildings in places like New York or Chicago with fanless radiators.

When electricity came out, adding a fan made heaters more comfortable at it evens out the temperature in a room.

Heat pumps are a fairly recent idea, and are by far the most energy efficient way to heat a house along with geothermal. Both these technologies are able to basically absorb heat from outside.

Even if it's zero degrees outside, there's still some heat because it's not -40 or colder.

Oil and propane are used for rural houses and have to be delivered by truck. More urban houses can have natural gas that's piped.

Hydrogen is a clean gas that could theoretically be used instead of natural gas, but probably won't be.

Burning things was traditionally much cheaper than electricity. So for big houses in areas with cold winters it made sense before.

Today if you burn natural gas, hydrogen, propane, oil, or wood at a power plant to make electricity. If this electricity powers a heat pump it will produce more heat than burning it at home.

As a result heat pumps work better than hydrogen at your home.

Heat pumps have trouble in super cold weather though, but they're improving as a new technology.

Early heat pumps struggled below 40 degrees Fahrenheit (roughly 5C).

Then they got them to work down to 32 degrees Fahrenheit (zero C).

Now some can work below -10 Fahrenheit (-23C).