Arrived for furnace blowing cold air. Upon arrival the system was heating properly and the house was back up to temp. I checked static pressure and it was good. I cleaned the flame sensor. I changed the filter. All running amps were good. There’s a 45 degree temp rise which is good. Cycled system multiple times to try to recreate an issue, but it never did. If something happens again, reach back out. Thanks for choosing LBA.