I notice about $50-80 per month extra now that I have central AC compared to when we didnt have it. But it totally depends on how much you use it (ie. keeping your house at 21 will mean higher costs than 24) and also the weather is a huge factor too, a couple hot weeks in July can really add up but a couple weeks of cooler temps means less usage
TLDR - it all depends on weather and usage
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