Sorry if I wasn't clear: there should be many possible ways to enter how much of what you've used. "Native units" as Robert called them. These get automatically converted to some internal unit, so that we're dealing only with apples, or only with oranges. My vote is that kWh be the internal unit, not therms (but input in therms should still be an option).
Most important right now is to get this tracker working, then we can focus on the UI.
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