I have a Goodman A/C for about 4 years, today my a/c started blowing warm and the outside unit is blowing cold air. Just last week I replace the filter and the a/c want out, the tech replace the capacitor because the fan went out. Now today the fan is working but the a/c is now blowing warm air inside the house.

It could be almost anything. I would call back the service company that did the repair since they were there just last week. It could be a wiring problem in the unit around where the last repair was made.