No charge per PC. Found a couple issues that could be causing her complaints. Relocated upstairs thermostat from hallway directly above open foyer/stairs. Moved thermostat to hallway beside master bedroom away from the stairs and installed a T4 thermostat to eliminate the thermostat being the issue. Also rewired high voltage to air handler. The way it was wired would only bring 5kw of heat strip. Rewired high voltage to the 10kw breaker. System is operating properly. So we will see!!!!!