Henry County · about 10 minutes south on I-75
AC Installation in McDonough, GA
A system replacement in McDonough is a decision, not an emergency — and it is a much better decision made before July than during it. We are ten minutes up the interstate.
Replacing a builder-grade system in McDonough
McDonough has grown outward in waves, and every wave arrived with whatever equipment was standard that year. If your house went up in the 2000s you are probably on your second system now, and the first one was very likely the cheapest box that met code on the day. That is not a scandal. It is just a thing worth knowing when you are deciding what replaces it.
One of the reviews on our Google listing is from a property manager who runs properties all over the Atlanta area and keeps using McGrath for new installs because they come in, in his words, "efficient and affordable". His words, not ours — which is the only kind of claim worth putting on a page like this.
One thing worth settling early: whether you are replacing the outdoor unit on its own or the whole system. Pairing a new condenser with an old air handler is legal, cheaper on the day, and frequently a false economy — the two halves are engineered as a matched set, and a mismatch can quietly cost you the efficiency you just paid a premium for. Sometimes a partial replacement genuinely is the right call. We will tell you which one you are actually looking at.
When replacing really is the answer
- The compressor is gone and the unit is well past ten years old
- It needs refrigerant every single season
- The repair quote is a serious fraction of a new system
- Upstairs never cools, whatever the thermostat says
- It’s loud, it’s tired, and it costs a fortune to run
From the Google listing
4.9 stars, 18 reviews, owner-operated.
Real reviews, published exactly as they were written. Every one of them is on the Google listing under McGrath Mechanical.
McGrath Mechanical is my go to choice for HVAC repairs and installation. As a property manager of properties all over the Atlanta area, I need a reliable HVAC source that will show up, diagnose the problem correctly, tell me the truth and make the repair at a reasonable cost. McGrath does exactly that! New system installations are efficient and affordable as well. I highly recommend James at McGrath Mechanical!
If he says he will be there then he will. James is fast, reliable, and gets the job done. I thought I needed a new unit but that wasn’t the problem. After about 30 minutes he had us up and running again. Any questions I had he was able to give me an answer. Highly recommend