A multimeter has saved me over $10k on hvac, automotive, electronics and general DIY repairs around the house. Everyone should have one because technicians aren’t fully honest. And they are a great safety tool for household electrical.

I recommend putting thermometers in your fridge, and also make sure your fridge is ventilating properly. It needs ample clearance and annual cleaning. If you haven’t cleaned you can do so. Or put your fridge on a kill-a-watt and ask AI to compare your cycle times to the Energy Star listing. if your fridge is running a lot longer than it should, it will likely fail