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To reduce costs, set your thermostat to a higher temperature when you're not home, use ceiling fans to help circulate air, and keep blinds and curtains closed during the sunlight hours.

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Signs include unusual loud noises like squealing, grinding, or banging, weak airflow, warm air blowing out, frequent cycles, strange odors, leaks or moisture around the unit, high humidity levels indoors, and increased energy bills despite same usage.

Common reasons include dirty or clogged filters, low refrigerant levels, faulty fans, or problems with the thermostat. It's best to call a professional to diagnose and fix the issue.

Routine maintenance for air conditioners should include checking and replacing the filters every 1-3 months, inspecting and cleaning the coils annually, checking the refrigerant levels, and ensuring that the drain channels are clear.

Typically, if your equipment is run continuously, an air conditioning unit can last between 7 - 15  years. However, this can vary based on the unit's model, usage patterns, and how well it has been maintained

Key factors include the size of the unit (capacity), energy efficiency ratings (like SEER), the type of refrigerant used, compatibility with your home's ductwork, and features such as programmable thermostats.