Still, I am left wondering how I have a constant 100W of capacity load. I'm also still baffled about the spike of about 140W for 20 minutes every hour. I went on holiday and shut everything down except 1 PC, the Wifi router and a few low power odds and ends. It was still there. I confirmed it's not the fridge or freezer by switching them off for an hour and it's still there.
I can't think of anything else that would consume 140W periodically.
The air con unit is about 3 years old, but it's probably a basic 1.5kW compressor and a few high flow fans.
100 VA capacitive reactance isn't really that much, and you didn't even unplug that PC. Did you actually
unplug all the other stuff in your house or use a physical shut-off switch (or open all the breakers)? The bridge rectifier -> capacitive-input filter in most devices will typically appear with a large capacitive reactive component, hence the requirement for modern higher power stuff to have PFC.
I would try shutting everything down, then shut off all the breakers and see what happens.
Unless you have some huge capacitor in some power filter somewhere, it should go towards 0 VA
R(eactive) as things are actually isolated from the line.