Regarding strategy ... it may be that the floating credit card plan is cheapest. Therefore best. Can you mange the big payment? If so, maybe you can endure for a year and then you will just be free of it. You can remind yourself that you really enjoy your improvements and that a year of austerity was the price of new counters, or the sweet assurance that bad wiring is not plotting to kill you.
If there's no way to keep up with those payments, maybe moving from once from the first 15-month card to a second 15-month card will solve the problem. Or maybe you can get a reasonable installment loan, set to pay down at brisk but not exhausting pace, and autopilot your way back to zero? Meanwhile put a little back in emergency savings each month to develop a shred of sanity and security.
If you are otherwise in good financial shape, you can take out the 20k. Don't feel too horrid. If you have a lot of other debts you need to look more carefully at your strategy.