Professional HVAC systems should be serviced at least once a year, ideally twice (in spring and fall) to ensure efficient, trouble-free operation. Regular service includes inspecting filters, coils, and motors. Homeowners should also clean or replace air filters about monthly (or per manufacturer guidance) to maintain air flow. Keeping filters clean and scheduling biannual tune-ups can extend equipment life and save energy

A water heater should be flushed of sediment at least once a year to maintain efficiency. If your water is hard or usage is heavy, flush more frequently (e.g. every 6 months). Annual flushing (draining and refilling) removes mineral buildup, improving heat transfer and extending the heater’s life. The EPA also recommends having a professional service your water heater yearly to check valves and connections

Generally, landlords must keep rental property habitable by maintaining major systems and structure (roof, plumbing, heating, etc.), while tenants must keep the unit clean and repair any damage they cause. By law (e.g. implied warranty of habitability), landlords must fix issues like roof leaks or broken furnaces. Tenants typically handle routine care (e.g. changing light bulbs, furnace filters) and yard upkeep if specified in the lease. Specific responsibilities may vary by lease and local law, but the landlord’s duty is to ensure safe, livable conditions.