What type of test locations are recommended for each area of the home with a separate heating and cooling system?

For a home that has a separate heating and cooling system for each area, it is recommended to conduct additional tests in each of those areas to accurately assess radon levels. This is because different sections of the home can have distinct radon exposure risks due to variations in foundation designs, ventilation, and even sub-surface conditions.

By performing additional tests, you ensure that the radon measurements reflect the specific conditions and potential concentrations in each area, leading to more reliable data. This is especially important in homes with multiple systems, as radon levels may not be consistent throughout the space. Regular testing helps in identifying areas of concern and ensures a comprehensive approach to radon assessment and mitigation.

The other options relate to testing methodologies that do not account for the unique conditions created by separate heating and cooling systems, which is why they are not the most suitable choice in this context.