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Houstonian Jim McIngvale, known as "Mattress Mack," has turned his two furniture stores into temporary shelters for Tropical Storm Harvey evacuees.

As the city started to flood, he posted a video online with a simple message: Come on over. He gave out his personal phone number. And hundreds of people streamed in.

"We sell home theater furniture that you watch TV in, they're sleeping on that. They're sleeping on recliners, sleeping on sofas and love seats. We have sleeper sofas, they pulled them out and slept on that," McIngvale tells NPR's Morning Edition. "They're sleeping on hundreds of mattresses throughout the store. They're sleeping on the couches — wherever they can find a place that's comfortable, and God bless 'em."

When some of the storm's victims couldn't make it across flooded streets, McIngvale dispatched his large delivery trucks and drivers to collect people and bring them to safety.

"We put out a Facebook feed that we were going to rescue people, because there was so much need," he says. "The city and the local authorities did a great job; they just couldn't get to all the 911 calls."

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McIngvale also has food for the evacuees — and he invited them to bring their pets, too.

"Think a slumber party on steroids," he says.

A slumber party — or maybe just a safe, dry place to wait out a record-setting storm.