A few years ago we bought a Carrier furnace for our house. It came with a blue washable filter. The prior system used regular pleated filters. Should this one be able to use a Filtrete or similar?
The other thing is we didn't clean the filter for over a year. I looked at the evaporator. There might be a little dust on it, but nothing is caked up. I tried spraying it with a can of aero-duster, and no dust flew up, but I wasn't able to really get it close in there. Is it worth having a technician check it out to see if it needs any cleaning?