Altena Cleaning B.V. specialises in cleaning, coating and renovating refrigerating and heating installations.

Its principal activities are:
- cleaning and coating air-cooled heat exchangers
- cleaning liquid-cooled heat exchangers using a high-pressure system
- cleaning liquid-cooled heat exchangers using circulation
- cleaning air-conditioning units
- renovating air-conditioning units
- cleaning air ducts
- cleaning and disinfecting cooling towers
- disinfecting water pipes