Tom. M. 12-11-24. No heat. customer stated the furnace runs the shuts off before satisfying the thermostat. Noticed air filters are extremely dirty I have replaced the air filter then completely a safety inspection on the furnace. Noticed multiple small holes in the heat exchanger I’ve shown the customer. Customer has signed an unsafe appliance form and elected to upgrade the furnace. Install is scheduled for 12-12-24 12 to 2 arrival time.