What size central air conditioning for a 1200 sq ft house?

For a 1200 sq ft house, a central air conditioning system typically requires a unit with a cooling capacity of about 2 to 3 tons, which translates to approximately 24,000 to 36,000 BTUs per hour. The exact size can vary based on factors such as ceiling height, insulation quality, and local climate. It's advisable to consult with an HVAC professional for a precise calculation, taking into account these variables for optimal efficiency.