There are several differences between a low and high quality home HVAC system:

• Efficiency: High-quality HVAC systems are typically more efficient than low-quality systems, meaning they use less energy to operate and can help homeowners save money on their energy bills over time.
• Performance: High-quality systems are designed to provide consistent and reliable performance, maintaining a comfortable temperature and humidity level in the home, while low-quality systems may have issues with temperature fluctuations, noise, and air quality.
• Durability: High-quality systems are made with durable materials and components, and are designed to last longer and require less maintenance over time. Low-quality systems may have inferior materials and components that are prone to breakdowns and require frequent repairs.
• Features: High-quality systems often come with additional features and functions that provide added convenience and control, such as programmable thermostats, zoned heating and cooling, and smart home integration. Low-quality systems may not have these features or offer limited functionality.
• Noise: High-quality systems are typically designed to operate quietly, while low-quality systems may produce excessive noise that can be disruptive to the household.
• Air quality: High-quality systems may come with advanced air filtration and purification systems, which can help remove allergens, pollutants, and other contaminants from the air. Low-quality systems may not have these features or offer limited air quality benefits.

Overall, a high-quality HVAC system can offer homeowners improved efficiency, performance, durability, features, noise levels, and air quality, while low-quality systems may have limitations in these areas. However, a high-quality system may also come with a higher initial cost compared to a low-quality system.