AC Academy
AC Academy
Sizing, install planning, and efficiency guides from our HVAC experts.
Latest guide
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.
Read the guide →
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 ...
Read the guide →
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...
Read the guide →
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...
Read the guide →
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 ...
Read the guide →
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...
Read the guide →
Wall Mount vs. Ceiling Cassette vs. Concealed Ducted Mini Splits
Compare wall-mounted heads, ceiling cassettes, and concealed ducted mini splits by installation, airflow, appearance, condensate drainage...
Read the guide →
Where Should You Install a Mini Split? Indoor and Outdoor Unit Placement Guide
Choose better mini split locations with this practical guide to indoor airflow, condensate drainage, line-set routing, outdoor clearances...
Read the guide →
Multi-Zone vs. Multiple Single-Zone Mini Splits: Which Setup Is Better?
One multi-zone condenser or several single-zone systems? Compare efficiency, redundancy, mode conflicts, line-set routing, electrical nee...
Read the guide →
What Is the New MRCOOL DIY Select Series and Why Should You Consider It?
Discover the new MRCOOL DIY Select mini-split series, its features, sizes and efficiency ratings, and how it compares with MRCOOL Easy Pro.
Read the guide →
Which Daikin Mini Split System is Right For You?
Which Daikin Mini Split System is Right For You? Choosing the right Daikin mini-split can definitely feel a bit overwhelming with all the...
Read the guide →
MRCOOL vs. Daikin: The Ultimate Guide to Choosing Your New AC System
MRCOOL vs. Daikin: The Ultimate Guide to Choosing Your New AC System If you are looking to upgrade your home's comfort, you have likely n...
Read the guide →