Performed prepaid maintenance. Homeowner was saying that it took all night to make the temperature of the first floor to climb 4 degrees. Checked everything out and the thermostat wires at the air handler had been eroding away and there was not a connection no more. Stripped back the wires to a new clean part and connected them back and now the floor heated up 5 degrees within 30 minutes. 2 systems. Both 2011 Downstairs air handler: MN/ rhll-hm3617ja SN/w061122798 Upstairs air handler: MN/rhll-hm3617ja SN/W081111217 Downstairs condenser: MN/13pjl30a01 SN/7689w101105788 Upstairs condenser: MN/13pjl30a01 SN/7689w071119935