Dean kicks off the second hour by taking calls, addressing questions about register placement to improve home temperature. He tackles issues with central air systems blowing weak and warm air, suggesting it might be time to call an AC repair professional to check the condenser or outside unit.

Dean explains that refrigerant should last the system's life, but pinhole leaks in the pipes can lead to a need for replacement. He also advises that AC systems function as dehumidifiers, but only when they're running.

Addressing another caller's inquiry, Dean discusses whether shutting doors can help AC efficiency. He generally advises against it, as the system is designed to service the entire home.

Finally, Dean recommends the Ecovent Whole Home System, which uses sensors to control vents and maintain air balance, providing an exception to the rule about not closing registers.