Trying to translate it:

Before: On very cold days, they usually kept their thermostat at 72°F.

Now: On very cold days, they’re keeping it at 67°F.

They're still talking about cold days in both cases, just showing that their habits have changed. (accustomed to/before vs. now)

I love to go outside (love as a verb)

Love is hard to define, but when you experience it, you will be able to define it. (love as a noun)

The concept idea of nouns ^