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Here are some formulas that are helpful in figuring out suppl. heat on air to air heat pumps.
KW required when CFM and desired temp. rise are known ( rule of thumb 1 ton = 400-500 cfm ) KW = CFM times T.R.(temp rise) divided by 3150.
Temp. rise = KW times 3150 divided by CFM
Amps = KW times 1000 divided by volts
example A 5 ton heat pump would need a 7.9 KW heater for a 10 degree T.R. This would require a 40 amp service at 208 volts just for the supplemental heater.