I thought the average BTU recommendations are 4000-4500 BTU's per 1000 watts of light. Therefore, if I were using 4-600 watts of HPS, that's 2400 watt's total. So, if you do the math, 12000 BTUS of a mini split A/C would do the trick, right? 22,000 BTU's sounds crazy. Please correct me if I'm wrong!