Another air cleaning method to explore are air cleaners that are ducted into the central cooling/heating system of a home.
By all means, do some research, but research technologies involved as well as manufacturers.
Here a few links related to residential air cleaners, types of air cleaners, and their benefits and hazards.
Again, please feel free to click the link in my signature to receive further information or a quote.
If you ever need anyone to housesit while you`re away, I have great references. But I bet everyone makes that offer.