There is not much time to help the market before the 2012 election, and given Congressional resistance to other types of stimulus, housing may be the only economic fix in reach. Federal programs to assist homeowners have been regarded as ineffective so far, and they are complex.

“We are looking at trying to encourage more participation in all of the programs, including those that help with refinancing,” said Phyllis Caldwell, who oversees housing policy at the Treasury Department.

Some economists say that with housing prices and interest rates at affordable levels, only fear is keeping consumers out of the market. Frank E. Nothaft, the chief economist at Freddie Mac, said the federal action could instill confidence.

“It almost seems to me you want to have some type of announcement or policy, program or something from the federal government that provides that clear signal that we are here supporting the housing market and this is indeed a good time to really consider buying,” Mr. Nothaft said.

The refinancing idea has been around since at least 2008, but proponents say the recent drop in interest rates to below 4 percent may breathe new life into the plan.

“This is the best stimulus out there because it doesn’t increase the deficit, it accomplishes monetary policy, and it reduces defaults in housing,” said Christopher J. Mayer, an economist at the Columbia Business School. “So I think this is low-hanging fruit.” Mr. Mayer and a colleague, Glenn Hubbard, who was chairman of the Council of Economic Advisers under President George W. Bush, proposed an early version of the plan.

The idea is appealing because it would not necessarily require Congressional action. It also would not tap any of the $45.6 billion in Troubled Asset Relief Funds that was set aside to help struggling homeowners. Only $22.9 billion of that pool has been spent or pledged so far, and fewer than 1.7 million loans have been modified under federal programs. But Andrea Risotto, a Treasury spokeswoman, said whatever was left would be used to reduce the federal deficit.