AC Academy
AC Academy
Sizing, install planning, and efficiency guides from our HVAC experts.
Latest guide
How Much Electricity Does a Mini Split Use? A Simple Cost Guide
Learn how mini-split watts, run time, efficiency, weather and electric rates affect operating cost, with a simple formula and monthly cost table.
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How Often Should You Clean a Mini Split? A Simple Maintenance Guide
Learn when to clean mini-split filters, check the drain and outdoor unit, and schedule professional service with this simple maintenance ...
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Best Mini Split Brands of 2026: Six Top Brands Compared
Compare Daikin, Mitsubishi, Senville, Pioneer, MRCOOL and Perfect Aire mini splits by installation type, cold-weather performance, produc...
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Do Mini Splits Bring In Fresh Air? Ventilation and Filtration Explained
Learn why most ductless mini splits recirculate indoor air, what their filters actually do, and when a home needs exhaust ventilation, an...
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What Size Mini Split Do I Need? Why Square-Foot BTU Charts Can Mislead You
Learn why square footage is only a starting point for mini-split sizing and how climate, insulation, windows, humidity, design-temperatur...
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R-32 vs. R-454B Mini Splits: What Buyers Need to Know
An expert buyer’s guide to R-32 and R-454B mini splits, covering GWP, A2L safety, efficiency, service compatibility, existing R-410A syst...
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The Best DIY Mini Splits of 2026
The best true DIY mini splits of 2026, ranked by installation design, efficiency, climate performance, configuration flexibility and value.
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Will a Mini Split Heat Below Zero? A Cold-Climate Buying Guide
A practical guide to cold-climate mini splits: low-temperature capacity, 5°F ratings, balance point, COP, defrost, multi-zone sizing and ...
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115V vs. 230V Mini Splits: Breakers, Wiring, MCA and MOCP Explained
A buyer-focused guide to 115V versus 230V mini splits, including what MCA and MOCP mean, why BTU cannot determine breaker or wire size, a...
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Mini Split Condensate Drains Explained: Gravity, Pumps, Routing and Leaks
Plan a reliable mini split condensate drain with this guide to gravity routes, pumps, cassette lift limits, safe termination and leak pre...
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Mini Split Warranties Explained: Parts, Compressor and Labor Coverage
Learn what mini split warranties really cover, how registration and installer rules affect protection, and which repair costs may remain ...
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SEER2 Isn’t the Whole Story: How to Compare Mini Split Efficiency
Learn what SEER2, EER2, HSPF2, COP and cold-weather capacity really mean—and how to compare mini splits for your climate, comfort and bud...
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