The answer to 'which is better SEER 16 or SEER 20' is that a SEER 20 unit is generally better than a SEER 16 unit. SEER (Seasonal Energy Efficiency Ratio) is a measure of an air conditioner's cooling efficiency, with higher SEER ratings indicating more efficient systems. A SEER 20 unit will typically use less energy to cool your home compared to a SEER 16 unit, resulting in lower utility bills and a smaller environmental impact.
However, the best choice for your home depends on factors like the size of your home, your local climate, and your budget. SEER 20 units are generally more expensive upfront, but the energy savings over time can offset the higher initial cost. A SEER 16 unit may be a more affordable option, especially for smaller homes or mild climates, while still providing good efficiency. Consulting with a professional HVAC technician can help you determine the right SEER rating for your specific needs and situation.