Hi my name is george and today I came home and smelled a burning smell coming out of my air conditioning vents and I noticed that my fan will not turn off so I changed my thermostat but that didn't work (I have a miller unit) so if anyone has any suggestions it would help me cause I don't have the money to have someone to fix it and again thank you for your time

Just the blower won't turn off, or does the ac unit outside run also? Look closely at all wiring and components in furnace to see any burnt areas that could have caused the burning smell. May be a bad board or fan relay, or wiring.

Cut the fuse