The background is that I live in a very old rental unit (100+ years old) with no A/C, so three years ago I bought a stand-alone A/C unit for my living room. It was plugged into a grounded outlet on a 15A circuit with my entertainment console (more on that later), and for the first summer I didn’t have any issues.
The second summer, one day the breaker tripped when the compressor came on. I called out an LG (manufacturer) tech and he took a look, and he said everything should be OK; in his opinion the circuit was large enough for the A/C, and the power draw of the entertainment center shouldn’t be enough to cause any issues. Probably just a one-time thing.
This summer, the third, some things have alluded to a much bigger issue. A few weeks ago I heard a loud crack/snap noise, but didn’t think much of it because I couldn’t tell where it came from. Then, this past Friday, I heard it again distinctly from the outlet. A cursory Google search indicated that it was likely an arc and/or a sign that the insulation was compromised, and that it posed an immediate fire risk. So I unplugged everything, turned off the circuit, and opened up the outlet. Nothing seemed to be wrong, however I’m not an electrician, so obviously I could have missed something. So I put the outlet plate back on, decided to get a 14 gauge extension cord to plug the entertainment center into another outlet, and I plugged the A/C back in.
For the rest the weekend I didn’t hear the noise again, however this morning I heard it again when the A/C wasn’t even running. So I unplugged it, turned off the circuit, and called my landlord to report the issue. However after that I discovered something I had no clue about...The refrigerator is hooked up to the same circuit, even though the outlets are on opposite walls.
I’m kind of at a loss as to what to do here or what to ask. Any general advice or suggestions would be welcome, but some off the top of my head...
Am I correct to assume that the A/C and fridge can’t or shouldn’t share the same circuit?
If my landlord claims everything looks good, can I trust them or does the noise (and its potential causes) warrant escalating the issue?
If they tell me I simply can’t have the A/C on that outlet because of the refrigerator, can I use the extension cord instead? It’s 14 gauge and explicitly marketed for large appliances, but I’ve also read a lot about how it’s not a good idea to use an extension cord for air conditioners.