Air this thin would not hold heat very well.

But women may do better than men as a room cools, because fat holds heat.

That dragging, careful voice held enough heat to make me nervous.

However, air does not hold heat very well, and these systems aren't recommended for residential use.

His fingers held heat and weight that they'd never had before.

I yelled the last, and the words held heat like the wind from some great fire.

Those last two words held more heat than a forest fire.

"Dogs need it more than humans," he said, because their coats hold heat.

Frost's voice held more heat than I'd ever heard in it, outside of the bed.