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Carrier Performance Series image: These central air units offer a SEER (seasonal energy efficiency ratio) rating of up to 18.

Editor’s Note: This product has been removed from our side-by-side comparison because it has been discontinued. Top Ten Reviews is no longer updating this product’s information.

John has been researching and reviewing home security and smart home products for Top Ten Reviews since 2013. As well as covering smart home and home security and safety, he also covers other home technology products such as HVAC, garage door openers and more. He enjoys DIY, writing and hiking in his spare time.