My house has really old window-mounted airconds that I intend to replace.

Are the aircond installation contractors able to remove them when they install the new (split) airconds?

Thanks.

I have no idea where to start looking for someone who can do this patching up. Any keywords to start?

These days, do airconds need magnetic starters?

I haven't given much thought about it, but right now I can hear a faint hum coming from the starter, and it's also warm to touch.

Because if I don't need it, and it wastes electricity and makes noise, I should get rid of it?

It doesn't come with a starter; it was a leftover from the old window rattler aircond (from 15 years ago or something like that).

I don't know why the contractor didn't just wire the new aircond directly instead of through the starter

Just bought an online electricity consumption meter for my house.

This chart shows my house total consumption. During this time I had two airconds running - one inverter, and one non-inverter.

The non-inverter aircond's 1000W cycles are quite clear. As the night progresses, the cycles become further apart. At about 11PM this aircond is turned off.

I drew in red my guesstimate of the inverter aircond's power consumption. Check out how it steps down gradually and eventually settles down on a cycle that's way smaller (in amplitude).