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Air Conditioners
Windmill VS
Keystone
Windmill
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New York–based startup focused on design-forward, eco-conscious window ACs
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Currently offers a single product line in multiple BTU sizes (cooling only)
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Known for ultra-quiet performance, smart connectivity, and clean aesthetics
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Excels in urban apartments and modern interiors
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Limited product variety and premium pricing hold it back for broader use
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Ideal for style-focused renters and tech-savvy small-space users
Keystone
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Value-focused brand with a solid range of window and wall-mounted ACs
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Sold widely through Amazon, Walmart, and big-box retailers
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Prioritizes affordability and reliability over bells and whistles
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Surprisingly quiet in some models, though lacking smart features
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Great pick for buyers who want no-nonsense cooling on a tight budget
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Most ideal for seasonal or low-demand use cases
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Windmill Air Conditioners
Windmill is one of the youngest — and boldest — names in the air conditioner market. Launched by a team of New York natives, the brand set out to fix everything people hate about traditional window units: ugly boxes, loud fans, and headache-inducing installations. Their flagship product is a sleek, whisper-quiet window AC with Wi-Fi control, eco-conscious packaging, and an interface so minimalist it could pass for a Sonos speaker. But for all its design chops, Windmill is still a niche player with limited muscle — so let’s see where its sleek simplicity shines, and where it’s not quite ready for primetime.
Keystone Air Conditioners
Keystone isn’t a brand that makes headlines — and that’s exactly its appeal. Often overshadowed by glossier competitors, it fills a critical role in the AC market: reliable, basic units that won’t drain your bank account. Keystone’s lineup includes a healthy variety of window units, a few through-the-wall options, and even dehumidifiers, all priced well below premium brands. You won’t find advanced features or connected apps here — just cold air, simple controls, and surprising performance-per-dollar. So, if you’re okay trading flair for function, Keystone might be your best-kept secret.
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