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Work with a qualified HVAC contractor to assess your home's needs and recommend the right system. Buying through a professional ensures proper sizing, installation, and access to warranties. While you can buy units directly, professional advice and installation maximize efficiency and longevity.

The cheapest HVAC system is a window air conditioner unit, costing between $150 and $550 to install. It's an economical choice for cooling individual rooms and doesn't require ductwork or professional installation. However, it may not provide the same efficiency or comfort for larger homes.

An HVAC system typically lasts between 10 to 20 years, depending on the type and quality. Regular maintenance can extend its lifespan and keep it running efficiently.

Installing your own HVAC system is not recommended due to complexity and safety risks. Professional HVAC technicians ensure proper installation, safety, and compliance with local codes.

HVAC systems are expensive due to the cost of complex equipment and specialized labor for installation. The investment covers efficient heating and cooling technology, professional sizing and installation, and long-term comfort and reliability.

If your HVAC system is over 15 years old and requires costly repairs, replacing it might be more economical. Newer systems are more energy-efficient and can save money over time. If repairs are minor and the system is younger, repairing could be the better option. Consult an HVAC professional for guidance.