Filter (cold air return) in-place 10 days or so and seems to be making a difference as coughing/sneezing reduced and sleeping better at night. I will purchase again.
As you say, filters aren't the most exciting product but I need them and I can't find the size I need locally. Thank you for stocking the size that I need.
Service was great. The filters I received were too long to fit my furnace, (1/4 inch) but I received my refund without question and asked to donate the filters to a charity to help someone in need. I would recommend Filterbuy because of price and excellent service.