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No, it's not necessarily.
From an electricity usage standpoint, it's cheaper to inefficiently cool one room than it is to efficiently cool a whole house.
Cleaning it also may solve nothing, it's $200 on a chance of it solving the problem. If cleanliness wasn't the issue, then you just wasted $200. On the flip side, you can find a used window AC for $200 easily, or buy a new one for $400 and then sell it when you're done with it and get $200 back, and it is guaranteed to solve your problem assuming you're concerned with a specific room.
I didn’t say cleaning would solve it. I said that a service tech should look at it and it was possibly a simple fix.
Also window units will have to fight against the rest of the house being warm. Interior walls are seldom insulated, warm air drafts in around the unit and around doors. A window unit in one room could cost as much as a dedicated unit for the whole house, as it has to work harder to maintain the desired cooling.
You said servicing the central AC will certainly be cheaper in the long run. That's wrong.
It might be, but it depends on a lot of other factors.
You seem to be biased against window ACs for some reason, and seem hell bent on misinforming people about them.
Decent modern window ACs will have a higher baseline efficiency than older full house units, and cool just the room you want. Conduction losses through the wall are minimal compared to trying to to cool literally 10x as much space. They are incredibly easy to DIY, and cost $500 up front, but you'll get half that back when you sell it when you're done with it. Literally the same price as the AC tech who's gonna come out and say that you need to install more return ducts, insulation, or another unit to keep up with the increased average outdoor temperature.
Like literally everything else, some are built cheaply, some are built well. Look up reviews before you buy.