Even a small change in interest rate will make a difference in monthly payments.
There will be extra costs to refinancing.If you can pay these extra costs (around $2500) you can save on your new mortgage.
If your existing mortgage is on a variable interest rate plan,switching over to a fixed rate mortgage will be beneficial.
Since all lenders are governed by the same rules,you should look for the best rate and terms.
All lenders do not offer loans with exactly the same rates.So once you have decided which type of mortgage will suit you best,go for the best rate and apply.