During this unprecedented societal shutdown due to COVID-19, many individuals are working from home, so most commercial buildings have either been closed down or are operating with a limited number of occupants. As a result, the HVAC systems in those buildings are likely operating on a reduced schedule, or else they may have been turned off completely.
However, just because buildings are closed does not mean that routine maintenance on HVAC equipment should be put off until occupants return to the building. Indeed, this is a good time for contractors to remind their commercial customers to take the opportunity to make repairs or upgrade their systems, or at a minimum, to keep up with the regularly scheduled maintenance.