info: From Mid-Atlantic’s Controlling the Temperature Inside Equipment Racks: 1. P = V × I 2. BTU/hr = watts × 3.412 Combine them at ~117–120V: • 117 × 3.412 ≈ 400 • 120 × 3.412 ≈ 409 So At 117 volts, each ampere of current drawn produces ~400 BTU/hr of heat output. So Middle Atlantic just rounded to 400 BTU/hr per amp for easy mental math. Almost all electrical power becomes heat in AV/IT gear Measured current is better than nameplate ratings This gives a fast rack-level heat estimate without needing resistance or detailed specs To convert BTU per hour → tons of HVAC (cooling): 1 ton of cooling = 12,000 BTU/hr Tons = BTU/hr ÷ 12,000 Therefore: Since BTU/hr ≈ 400 × amps Then: Tons ≈ (400 × amps) ÷ 12,000 Tons ≈ 0.033 × amps Power consumed by cooling system HVAC efficiency is usually given as EER or SEER. (EER = Energy Efficiency Ratio) (SEER = Seasonal Energy Efficiency Ratio) Using EER (most direct for this): • Power (W) = 12,000 ÷ EER Common EER values today 10-15 Use ~1 kW per ton as a safe, simple assumption