Performed diagnostic on both systems in the home. Upstairs system is a 2021 carrier furnace. Upon start up the system has a code 33. This is a code for high limit being open. When I tested these limit switches, they have continuity through them. Switches are not bad. System needs a new control board. Called Mingledorff’s Marietta, This part is in stock, but it’s very expensive. Will quote price to repair. Upstairs system also has a condensate pump in the attic highly recommend deleting this and correcting the drain to be a gravity drain. What happens with condensate pumps in the attic as they simply freeze and bust and then there will be water on your ceiling in the spring time. Main level system is a 2003 Rheem furnace and AC unit. This furnace is in very poor condition. The furnace has a blower that continually stays on. Upon inspection this furnace found major issues with it. Furnace has a back in control board. Removed low-voltage wires to make sure we did not have a low-voltage is