Filters on cold air returns
Regular viewers will know at the moment I'm particularly interested in cold air returns, and whilst painting, I've noticed how dusty my cold air ducts are. I plan to get them cleaned (I know, it's controversial) but I can see they're dusty beyond where I can reach with my vacuum.
SInce I have a dog, I'm mindful of the fact the current CARS are floor-level and will vacuum up a lot of dust etc when system's running.
I'm wondering if pre-filters are the way to go. Granted two things - one, if they're not changed or cleaned often, they'll affect the system performance, and also, I doubt they'll be very effective unless I weatherstrip around the edges so all air runs through the filter.
Is this a good idea? Will it, for example, extend the life of the system filter? Will it help keep the ducts clean, once I've had them done?