The Economic and Social Research Institute has found that mortgage holders can get a better deal when they read independent advice.
However, the think tank also found some serious misunderstandings about how mortgages work.
The ESRI and the Competition and Consumer Protection Commission brought together a sample of 110 people with mortgages and gave them a series of questions.
They were asked to evaluate mortgage switching offers. They were then stopped halfway through and asked to read the advice on mortgages posted on the CCPC website.
The experiment found that before reading the advice, some had opted for cashback offers in preference to offers with lower Annual Percentage Rates or APR's.
This would have meant higher repayments over time.
Reading the advice, however, did make some choose the cheaper option of a lower APR.
The exercise also found that only a third knew that switching mortgages involves paying for a solicitor, while only a quarter knew about the need to pay for a property valuation.
Three quarters also misunderstood what an interest only mortgage was and one in ten misunderstood their debt liability were they to fall into arrears.
"There are large gains to be had for many families by switching mortgages, so it is encouraging to see that reading official advice improves consumers' decision-making and their confidence," Dr Shane Timmons, of the ESRI's Behavioural Research Unit said.
"Cashback can be useful, but in our experiment consumers placed too much weight on it until they read the advice. Generally, most people are better off securing long-term savings from a lower APR," he added.
Fergal O'Leary, a member of the Competition and Consumer Protection Commission, said that for most consumers, taking out a mortgage is the largest financial commitment they will make.
"It is crucial therefore that they fully understand the terms and conditions as well as the full long-term cost of the mortgage they choose," he said.
Mr O'Leary said the CCPC commissioned the research to better understand how consumers make decisions in the context of the different special offers and rates available in the mortgage market.
He said the research clearly shows that it is worthwhile to take some time to review the independent information, including the mortgage comparison tool, at ccpc.ie.
"This is the case for first time buyers but equally so for many consumers who could save on their mortgage by switching. Taking a few minutes to check ccpc.ie can help consumers cut through the advertising material and allow them to get the best deal for their needs," he added.
Trevor Grant, Chairperson of the Association of Irish Mortgage Advisors, said the research demonstrates the importance of getting expert market-based advice before making any financial decision.
"In some circumstances, cashback offers make sense for consumers, however some people can be unduly swayed by the immediate promise of "free money", even if it means they may have to pay more initially for their mortgage," he said.
"Often these monies are understandably earmarked for white goods or furniture and whilst this is perfectly fine, it is vital that the borrower understands any longer term implications of their choice of mortgage provider."