Get rid of carpets, rugs and soft furnishings in that room. If necessary, you could cover any guest-bed etc. with polythene sheet, to floor level, to stop that source of dust. Use dustcovers on the enlarger etc.
Keep out cats and filter any incoming air. A desktop air-filter is cheap and can be left to circulate/clean for a day or so. After any regular cleaning, wait a day for any disturbed dust to settle again before printing. The film-drying cabinet idea is useful, or you can make something from foamboard and polythene sheet for a more collapsible alternative which can fit the 64" length of a roll of 135 (most of the fold-up temporary wardrobes I have looked at are too short).
Isn't most house dust made of dead human cells? This could suggest that you are currently breathing in the remains of the previous occupants, repeatedly. What fun . . .