I went under house and found the air pendlem box rusted out on bottom

Thermostat wear you set the temp is in hallway it shows 69 on both side it donest drop before it kicks back on

Fix the plunum and most all of your issues will go away. You can patch it but a contractor will have insulated duct material and tools to do the job. I'd get 3 bids from contractors before tackling it myself.