HVAC, discussed in two previous issues, is just one area to address as summer heat approaches. April showers may bring May flowers, but they bring less desirable things as well. This time of year, you should also check for:

• Rodents. Inspect equipment rooms for the telltale signs of rodents: droppings, bits of grass or paper, and scratches. If found, combat the problem by sealing up any holes or passageways and treating the area with an approved repellant.
• Birds. Returning from winter, birds are looking for places to build nests. High ceiling areas, outbuildings, service drops, service transformers, and lighting fixtures (especially security lights) are some of the more attractive locations. Remove any inactive nesting materials to combat the problem.
• Insects. If you have grounds to maintain, you know to remove standing water and to apply insecticides about now. But the electrical system may also need preventive insect care. Insects entering their breeding season may build nests in or near electrical enclosures. They like the warmth in these spaces. Special safety note: If you have a fire pump, check every enclosure associated with it. Remove all nests and treat areas appropriately.
• Fungi. That black mottling on light fixtures, in HVAC equipment, and on enclosure walls is probably fungi. Also check electrical equipment associated with process cooling water and similar systems. If these levels are abundant, then you may want to try and permanently adjust the humidity levels in these areas.
• Vegetation. You know to keep vegetation away from transformers and gas supplies. But other equipment also needs to be vegetation-free. Walk around the grounds and note which outdoor equipment needs defoliation. Then, remove all vegetation at the same time. You may need an arborist to prune or remove trees.