are there any guidelines for estimating the energy kWh consumption for a walk in freezer?

I am an energy auditor working on apartment building that has a 64 sq ft walk in freezer with a Copeland Copelamatic KAMB-007-CAV-800 3/4 HP compressor that is running all the time....is the compressor HP sufficienct to estimate power?

Is it normal for the compressor to run all the time? the insulation and seals are good on the unit.

finally, what is needed to estimate power consumption for commercial fridges and freezers?

thank you!
Steve