My ac line freezes up every two days. I turn the unit off for hours and then it work again for two days

There are several reasons for this. Hopefully, it's just low on freon. But it will have to be checked with gauges. Make sure you have a clean filter.

XenoSapien

XenoSapien is correct, check your filter. To check if your pressures to see if you need to add refrigerant, you will need to call in a tech. You need to be certified to do this. Good Luck.