Mine is also paid for, otherwise I would not be retired.
Be careful as Crazyhen said. If you can lock the low rate in now, that is great. But don't go for any of that fancy stuff that got so many people in trouble. Lock that same rate in for the life of the loan. Inflation is going to hit at some point. Rates are going to go way up at some point. I don't know when, but at some point it will happen. It always has in the past. We have never been able to solve world hunger for all time, no war has ever ended all wars, and no government manipulation will ever end inflation for all time.
If you can, it is a great time to take advantage of the opportunity. It is legal and it is ethical.