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On the cooling side, we had virtually no air conditioning. Just a few crappy portable units scattered throughout the building, with a total combined cooling power of about 20,000 BTU. This wasn’t quite enough to beat the heat in the event of a fully occupied building on a 100F day. ...
The problem is that it will take DIY, even for reversible heatpumps the automation isn't really designed for hot and cold storage tanks AFAICS. Also high capacity heat exchangers for ducted air conditioning probably aren't cheap. It is mostly for really big installs ...
Enter a few bits of key information about your climate and home, and the Mini Split Size Calculator will tell you the optimal size required for efficient and effective air conditioning and heating. Our calculator is precise and highly useful. Mini Split BTU Size for Room Types This table gives...