My 2015 Ford Focus is overheating when the A/C is on and randomly when driving

What is your question?

I drive a 2015 Ford Focus with a manual transmission. When the A/C is on it was only blowing extremely hot air, I realized the car was over heating which I thought was why it was accelerating slowly. I had the clutch and gas both down in first gear trying to move and my RPMs were rising but I wasn't moving forward. My emergency brake wasn't on. After I turn the A/C off the gauge went down from "H" to the middle and the car drove normal. From there only at random did it over heat and not accelerate from a stop(the A/C was off) . My husband called the mechanic but I'm hoping to get some info to avoid getting ripped off at the mechanics.

What makes this problem better or worse?

It’s worse when the A/C is on and when I stop/try to shift in first second or third gear

How long has your 2015 Ford Focus had this problem?

24 hours