Guides

Honest, no-nonsense AC guides

Built on the same verified spec database as our comparison table and sizing calculator — no sponsored rankings, efficiency stated in its true metric, and running costs in real dollars. See how we evaluate.

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Sizing

How Many BTU Do I Need? AC Sizing, Explained

The 20-BTU-per-square-foot rule is only a starting point — climate, sun, ceilings, and insulation move the rea…

7 min read · Updated June 2026

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Buying Guide

The Best Portable Air Conditioners of 2026

The dual-hose verdict: why hose design matters more than BTU, which inverter portables actually run quiet, and…

8 min read · Updated June 2026

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Buying Guide

The Best Window Air Conditioners of 2026

Six window units worth your money this summer — picked from our 18-unit database on verified CEER efficiency,…

8 min read · Updated June 2026

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Explainer

SEER2, CEER, EER: What AC Efficiency Ratings Actually Mean

Three different ratings, three different test conditions — and comparison sites that mix them up cost you real…

6 min read · Updated June 2026

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Buying Guide

The Best AC for Apartments & Renters in 2026

No window? Strict lease? We mapped the quietest, most efficient cooling options that won't cost you your secur…

11 min read · Updated June 2026

New guides ship weekly — sizing, comparisons, and best-by-use-case picks.