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Square footage: This is a starting point, but not the only factor. Larger homes will generally need larger HVAC systems. Climate: Homes in hotter climates will need a larger capacity than homes in milder climates. Insulation: Homes with good insulation will need a smaller capacity system than homes with poor insulation. Ductwork: Leaky ductwork will reduce the efficiency of your system, so you may need a larger capacity system to compensate. Sun exposure: Homes that get a lot of sun exposure will need a larger capacity system than homes that are shaded. Number of occupants: Homes with more occupants will generate more heat and need a larger capacity system. Here's a rough guide to HVAC size based on square footage: 600-1,000 square feet: 1.5 tons 1,000-1,500 square feet: 2 tons 1,500-2,000 square feet: 3 tons 2,000-2,500 square feet: 4 tons

System Maintenance: Change your air filter regularly: A clogged filter restricts airflow and makes your system work harder. Check your filter monthly, especially during heavy use months (summer and winter), and replace it when dirty (at least every 3 months). Schedule regular tune-ups: A qualified technician can clean your system, check for leaks, and ensure it's running at peak efficiency. Aim for a tune-up annually. Optimizing System Performance: Install a programmable thermostat: Programmable thermostats allow you to set different temperatures for different times of day and days of the week. This way, you can avoid heating or cooling an empty house. Set your thermostat strategically: In the summer, aim for 78 degrees Fahrenheit (25.5 degrees Celsius) or higher. In the winter, set it to 68 degrees Fahrenheit (20 degrees Celsius) or lower. Even a few degrees can make a big difference in energy use. Improve airflow: Keep furniture and curtains away from vents to ensure unobstructed airflow throughout your home.