Just bought a bigger house had six kids and got custody of grand daughter both pipes from furnace keep freezin when central air is on can someone please help me we are roasting I have paid over 800 dollars to repairmen works a day or two then does samething

Sounds like the relay switch is going or gone. Call them back and have them properly recheck the unit. Usually this will happen when it is very humid outside. After spenging that kind of dough I'd call them and complain very loudly and get them back to look at and this time repair the unit properly,