U.S. President Barack Obama on Thursday hailed historically low interest rates, which he said could save homeowners who refinance their mortgages about $1600 a year.

"Rates are as low as they've been since 1971," with the 30-year rate at 4.78%, Obama said after meeting with homeowners who have refinanced their mortgages recently. He attributed the decline in part to "extraordinary actions" taken by the Federal Reserve, and in part to actions taken by the administration.

Lower rates are prompting a flood of mortgage refinancings, which rose 88% in the past month, Obama told reporters. He estimated the average homeowner could pare hundreds of dollars a month, or an average of $1600 a year, by refinancing, and urged homeowners who haven't refinanced to consider doing so.

"We hope that everybody takes advantage of it," Obama added. He said between seven to nine million homeowners might qualify to refinance their mortgages at lower rates, putting more money in their pocket each month.

Obama warned homeowners to avoid refinancing scams, saying that if they are asked to pay money up-front before a refinancing, "it's probably a scam."

The president declined to comment on piracy, telling reporters that he wants to keep the focus on the administration's efforts to keep people in their homes.

 
  -By Judith Burns, Dow Jones Newswires, 202-862-6692; Judith.Burns@dowjones.com