Customer Service: Seasonal Maintenance Tips Test the cooling system prior to those hot summer days. Thus, any problems can be detected before they arrive. Remember to regularly clean or replace the filter in the HVAC system. Check sump pump for proper operation. Inspect the seals on windows and doors, maintain paint, and caulk, if needed. Change batteries in smoke & carbon monoxide detectors and test for proper operation. If your lawn has been newly seeded or repaired....WATER, WATER, WATER For more mature lawns, fertilize to promote a healthy start for the growing season.