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Other than environmental controls (eliminate standing water), this might be the stuff:

https://www.domyown.com/deltagard-insecticide-p-16550.html

That stuff works unreasonably well. Mosquitos so much as landing on surfaces treated with it weeks prior die within minutes, yet its so safe for mammals, farmers spray it directly onto cattle.

The terrible downside is that it is ridiculously toxic to marine life. Use with care and forethought.

That, and toxic to other pollinating insects.

Is this the pyrethrine family? There are various wall-plug mosquito repellants that contain pyrethrines, I didn't want to use tablets/liquids etc but if they're safe they would be a lifesaver.

My flat doesn't have mesh screens and I would much rather open a window than turn the AC on at night, but I then get lots of mosquitos.

Yes they are prethrine based. I've never found the plug-in types to be too effective. But I probably wouldn't detect a 30 or 50% reduction.

Get mesh screens! I never understood why they're non-existen in Europe (and probably other places). Or a mosquito net over the bed?

So deet?

Nope, pyrethrin insecticide. Like lice treatment.

Aha. Thanks.

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