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Im in Sydney and I've got an AC unit from the 70s or 80s in a house I recently bought. Im very hesitant to turn it on as I know it will be super inefficient. Im hoping to replace it later in the year. But until then its layer up! unless guests are coming over.

Would it actually be that inefficient? I honestly don't know, but am curious if the tech has changed that significantly. Consider lifecycle costs (both financial and resources) before replacing it; might just need a clean and service.

In my case at least, replacing a 70s Carrier "window A/C" (that was actually embedded in a hole in the wall instead of a window) with a modern ductless mini-split with inverter-powered compressor resulted in almost 70% lower power consumption, not to mention the fact that the new unit is virtually silent.

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