The 419-3 vote sent the aid package -- likely the first of several -- to the Senate in hopes of sending the bill to President Donald Trump before dwindling federal disaster reserves run out at the end of this week.
"Help is on the way," said Texas GOP Rep. John Culberson, whose Houston district was slammed by the storm. "The scale of the tragedy is unimaginable. But in the midst of all this, and all the suffering, it really reflects the American character, how people from all over the country stepped up to help Houstonians recover from this."
The first installment in Harvey aid is to handle the immediate emergency needs and replenish Federal Emergency Management Agency reserves in advance of Hurricane Irma, which is barreling through the Caribbean toward Florida.
"This is a chance to be your brother's keeper," said Houston Democratic Rep. Al Green. "This is chance for the unity that we express when we're before the cameras to manifest itself in the votes that we cast here in Congress."
Far more money will be needed once more complete estimates are in this fall, and Harvey could end up exceeding the $110 billion government cost of Hurricane Katrina.
"My friends and neighbors' homes were completely flattened by Hurricane Harvey's winds. Businesses were destroyed," said Rep. Blake Farenthold, R-Texas. "FEMA will be out of money in just two or three days if we don't pass this."
Politics quickly intruded as Democratic leaders insisted they would back the measure in the Senate only if it were linked to a short-term increase in the nation's borrowing limit, not the longer-term hike that Republicans and the Trump administration want.
And some Democrats from the New York delegation reminded Texas Republicans that they opposed a larger aid bill for those harmed by Superstorm Sandy in the Northeast five years ago.
"What you did to us during Superstorm Sandy should not stand, should not be done to any other people, anyplace in the country," said Rep. Eliot Engel, D-N.Y. "We're one country, we're Americans. We need to help those who need help."
In the Senate, GOP leaders want to link a long-term increase in the debt limit -- until 2019 -- to the Harvey aid, but that plan faces opposition from conservatives and thus will need Democratic votes.
"I think it's a terrible idea," said House Freedom Caucus Chairman Mark Meadows, R-N.C., who conceded that conservatives were getting outmaneuvered.
"I think at this point there are bigger issues that we have to focus on," Meadows said.
House Minority Leader Nancy Pelosi, D-Calif., and Senate Minority Leader Chuck Schumer of New York want to retain Democratic influence and trying to ensure the Republican-controlled Congress addresses health care and immigration as the hectic fall agenda kicks off.
"Given Republican difficulty in finding the votes for their plan, we believe this proposal offers a bipartisan path forward to ensure prompt delivery of Harvey aid as well as avoiding a default, while both sides work together to address government funding, DREAMERS, and health care," Pelosi and Schumer wrote.
Senate Majority Leader Mitch McConnell, R-Ky., said again Wednesday that increased Harvey costs show the importance of acting swiftly to increase the government's debt cap to make sure there's enough borrowed cash to pay out the surge in disaster aid.
Analysts at the Bipartisan Policy Center, a Washington think tank, say Harvey aid wouldn't cause a cash crunch for weeks.