Completed two system, furnace, maintenance and inspection. I cleaned flame sensors and wipe down furnaces. I tested components and amp draws. I checked air pressure and temp splits. The furnace for the common area needs a filter replacement. One of the employees mentioned how one of the bedrooms is colder. I looked into it and found a full vent on the floor in the basement. I could not find the hole in the subfloor that it would have connected to, but we would be able to run a new uct line to that room so that way the room holds temperature as it should. With multiple employees and residents, I would also recommend considering elevating the air quality in the building. The best way to do that is with a UV whole home air purifier. This will clean the air of germs, bacteria, viruses, and allergens. For the UV air purifier to work properly it would be recommended to have an air purifier in each system. Both furnaces are operating within manufacture specifications at departure.