Continuing low interest rates for 30-year mortgages _ now hovering at 3.75 percent _ may be sparking a new wave of refinancing.

Interest in refinancing is created by the power of suggestion _ when a homeowner sees opportunity, said Jerome Scarpello of Leo Mortgage Inc., in suburban Philadelphia.

โ€œI took an application last week, and the borrower said, โ€˜My brother told me rates are down, and this is a good time to refinance,โ€™โ€ Scarpello said.

Another borrower applied for a 20-year term _ lowering the duration of the mortgage as well as the interest rate, he said. Currently, a popular choice is the 15-year mortgage, with rates being offered below 3 percent, Scarpello said.

โ€œWhen I started in 1987, someone told me you have to lower your rate at least 2 percent for it to be worth it,โ€ he said. Today, he continued, โ€œI believe you should recoup your costs in two years _ plus or minus _ for it to be worth it.โ€

No big increases in interest rates are on the immediate horizon.

โ€œAbsolutely,โ€ said Fred Glick, chief executive of U.S. Loans Mortgage Inc., in Philadelphia, when asked whether he had seen an uptick in refis. โ€œThe rates, along with the lifting of program restrictions in the aftermath of the 2008 (economic) crisis, has helped propel people into exploring refinancing.โ€

Mark Zandi, chief economist at Moodyโ€™s Analytics, said, โ€œWe are estimating $850 billion in refinancing in the first quarter, at an annual rate, up from $750 billion last year. As long as fixed rates remain below 4 percent, refi activity should remain strong.โ€

In 2015, refinancings made up half of all mortgage applications. This year, Sean Becketti, chief economist at Freddie Mac, the government-sponsored mortgage-loan giant, expects them to be 40 percent of the total.

Thatโ€™s because the pool of borrowers who havenโ€™t yet refinanced their mortgages is getting smaller, Becketti noted. โ€œI think we will see refis in the neighborhood of 2014 ($500 billion), but less than last year.โ€

The wild card, he said, โ€œis that we are seeing more cash-out refis, not ones to lower rates, especially among borrowers in areas of the country with homes that have more equity.โ€

Kristin Reynolds, an economist at IHS Global Insight, in Lexington, Mass., said, โ€œMarch continues to be stronger than last year, as mortgage rates have declined relatively steadily year to date.โ€

In its most recent weekly tab of refinance applications, however, the Mortgage Bankers Association of America noted that the numbers had dipped by 3 percentage points.

The Federal Reserveโ€™s decision last week to keep interest rates unchanged โ€œmay help refinancing in the near term,โ€ Reynolds said, though the stage is set for a June boost in the federal funds rate.

Most industry observers had predicted that fixed-mortgage interest rates would increase in 2016 rather than decrease. One reason for the prediction was that the Federal Reserve was reducing its involvement in the mortgage-backed securities market.

Zandi said the Fed was still buying mortgage-backed securities to replace any it owns that are โ€œprepaying or maturing,โ€ but has stopped adding new ones.

Yet U.S. banks โ€œhave stepped up their buyingโ€ of mortgage-backed securities โ€œin part to meet their stiffer liquidity requirements,โ€ he said.

โ€œGlobal investors have also been avid buyers, given the turmoil in global financial markets, since U.S.-backed (mortgage-backed securities) is, as they say, โ€˜Money good,โ€™โ€ Zandi said.

When demand for a finite number of mortgage-backed securities rises, prices go up and yields and interest rates decline.

If there are fewer investors buying mortgage-backed securities, prices drop and yields and interest rates increase, said economist Joel Naroff of Naroff Economic Advisors, in Holland, Pa.

Readers may email Alan J. Heavens at aheavens@phillynews.com or write him at The Philadelphia Inquirer, Box 8263, Philadelphia PA 19101. Volume prohibits individual replies.