Efficiency of the dehumidification process, can have a large impact on the energy efficiency of the overall grow facility.
Dehumidification efficiency is typically expressed in moisture removal efficiency in Pint per kWh. Standalone dehumidifiers are tested at 80F/60% RH per a standard developed by AHAM. Efficiencies can range from around 4 pint/kWh to up to 9 pint/kWh. DOAS units are rated using what's called ISMRE, Integrated Seasonal Moisture Removal Efficiency, which is a value that is weighted based on the efficiency at various conditions (similar to how IEER is a weighted seasonal value).
How are these high efficiencies achieved and how do I have them benefit me? The simplest way is to include high efficiency dehumidifiers in your facility.
With more custom equipment, there are a few methods of pre-cooling the air before it hits the cooling coil and reheating it it after the cooling coil using devices, such as heat pipes, air-to-air heat exchangers, and "run around" glycol loops. Desiccant wheels can also be incorporated in designs to improve efficiency and in addition reach setpoints that would not be possible with condensation based dehumidification alone. These are fairly expensive options to include in air handlers or DX packaged units though can be worthwhile for facilities planned for long term operation.
Some standard dehumidifiers include similar technologies to achieve high energy efficiency ratings.
Desiccant can also be used when excess heat is available, such as from on-site power generation.