nerak let me tone in on your situation -
I can relate to your situation - I'm also attending school - taking a night class at a technical school two nights a week (4 hours each T/Th), plus starting in two weeks starting two classes at a university four days a week 8:00 to 12:00pm. I am cutting back my working hours.
I work doing modifications for an attorney firm, my hours are pretty much flexible, as well as working from home on my laptop. I do most of my work via the telephone, fax and email.
You should not look at a modification because you already have a low interest rate. The only way you would qualify for a modification, if you were behind on your payments. Maybe you could qualify for a program called Fresh Start at a lower interest rate.
I am not telling you to not pay your mortgage. Because you will do more damage to yourself than what you actually save.
Again - I am not telling you not to pay your mortgage, because this will also drop your credit score.
I use to do mortgages - when it comes to refinancing, figure about 5% total closing costs (this includes appraisal, title, banking, and other closing fees). This is an average across America to figure in closing costs. If your in Florida, it's slightly more. Colorado, Hawaii and Alaska much more......
Realistically since you are at 5.625% now - that's a pretty good rate. Reducing it down to 4.5%, how much would you really save?
Another thing is your value, I can bet your value has probably gone down since you brought your home last last. Which means you don't have enough equity to qualify for a lower rate.
The cost to do the refinance vs actually sending in one extra payment a year. I bet in the long run you would save more in interest by sending in extra.
One extra payment a year will knock about 7yrs of a 30yr mortgage. One extra payment on a 20yr, will reduce the term down to around 16yrs. Not to mention this gets reported to the credit bureaus as you are being more responsible, and your credit score shoots up.... I do that now, sending extra on my payments and have a 797 mid score.....
I think you should approach you situation from a different angle. Instead of trying to reduce your payment. Look at other streams of income.
Something that I did that made me alot of money, I invested a small amount in three different stocks. Bank/America (Bac), Citibank (C), and AIG. In two months I have had a 26% return on my money, plus it is still going up.
This week I paid cash for a new 2 car driveway and a new bathroom in our house.
Good Luck
My 2 cents........