The answer to 'how to maintain installation' is to perform regular maintenance on your HVAC system to ensure it continues to operate efficiently and safely. This includes cleaning or replacing air filters, inspecting and cleaning the condenser coil, lubricating moving parts, and checking the thermostat and electrical connections.
It's recommended to have your HVAC system serviced by a professional technician once or twice a year, typically in the spring and fall before the peak heating and cooling seasons. They can perform a comprehensive inspection, identify any issues, and make necessary adjustments or repairs. Keeping up with regular maintenance can extend the lifespan of your HVAC system and help prevent costly breakdowns.