Since it is winter time now, we are now replacing our furnace filters as frequent as possible. This is to make sure that all the dust will be filtered out since our heater is functioning constantly. Well, in our house, we chose to have 73F not just for winter days but all year round. But sometimes if it will be so cold, we will use the 74f-75f. It doesn’t matter if we will be paying high utility bills for as long as we are comfortable, that will be it! Anyway, going back to filters, glad that we chose the right brand!