I was called to a home in the middle of winter to repair an oil-fired warm air furnace with air conditioning. The furnace was not working, and the customer was in a panic. I arrived at the house and immediately diagnosed the problem as a dirty oil burner. I cleaned the burner and serviced it, and the furnace was back up and running in no time. The customer was very grateful for my quick and efficient service, and I was able to keep them warm and comfortable during the cold winter months.