Is there any way to set up their cage outside for the spring and summer at least? Or possibly build a small aviary or loft or convert a small shed or similar area? You wouldn't need a huge area for them to be happy in, enough room to fly a bit is good. The air filters and bagless vacuums both help a lot. I have pigeons, other small birds, cats and dogs inside so I feel your pain! Well, and goldfish, but I'm pretty sure they're not a problem. . .