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More expensive, losses at gathering, conversion, storing steps. Additional complexity of heat-pumps.

What they describe is basically few twisted pipes and a tank.

I'd feel way more enthusiastic about the whole idea if it didn't involve large quantities of highly caustic 30%-50% NaOH solution.

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Heat pumps have greater than 100 percent efficiency when compared to a regular resistive electric heater (which is already 100 percent efficient, when measured as heat out / energy in).

Everyone always forgets about the part where you're cooling down the outside...

How can something be >100% efficient?

We abide by the rules of thermodynamics here boy.

https://en.wikipedia.org/wiki/Heat_pump

You could have just googled it. The heat is moved around, it's not created. You can move energy, can't you?

Yes. Heat-pumps will make up for some losses from all other steps but I highly doubt it all togrther will reach efficiency of purely thermal system. Heat pumps also rely on access to medium that they cool down to get the additional heat and are at least as complex as a fridge or air conditioner.

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