You really need to give a little more information in order to get the best answer: how much is your house worth today, how much is your remaining mortgage, what interest rate are you paying.
If you have some equity, go for a Home Equity Line of Credit (HELOC). Shop the interest rate and the terms around from your mortgage company, your bank, and other banks. Most offer $0 in closing costs as long as you keep the HELOC open for 3 years. Basically whatever the line of credit is, you can tap into by writing a check at any time, pay some off, and then write another check at any time up to your credit line. Generally the interest you pay on the money is also tax deductible. Also, you only pay interest when and if you use the line of credit. It doesn't cost you anything unless you tap into it, so you can also use it for temporary emergencies, and just keep it open even if you don't need it at the moment. It shouldn't cost you anything to leave the line of credit open but unused.
An interest rate with good credit is around the Prime rate (currently 7.75), plus or minus 0.25 point.
If you have a high interest rate and/or an adjustable rate mortgage on your regular mortgage and your house is worth the same or more than when you bought it (it might not be in a lot of markets right now), then instead of a HELOC you should just look to refinance to a lower interest rate. Make sure it's a fixed rate. Then you can use the money you save to pay off any higher interest debts such as credit cards and then do some of the repairs to your home.
Being that you want to get your mortgage payment lower, you should refinance first, and then get the HELOC after you refinance to do the repairs.
Real Estate Investor