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HVAC metrics:

SEER = (1 × EER_100% + 42 × EER_75% + 45 × EER_50% + 12 × EER_25%)/100

EER = BTU_cooling/W

HSPF = BTU_heating/W

COP = Q (useful heat)/W (input work)

ACH = CFM x 60/Area x Height_ceiling

Total Heat (BTU/hr.) = 4.5 x CFM x Δh (std. air)

Sensible Heat (BTU/hr) = 1.1 x CFM x Δt (std. air)

Latent Heat (BTU/hr) = 0.69 x CFM x Δgr. (std. air)

1 HP = 746 Watts

1 kW = 3413 BTU

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