http://www.myhealthbeijing.com/...rmb-my-test-results/

read this by Us Md in beijing

he does not believe the more you spend the better they are

dont trust the built in ppm measurement

get a laser egg seperately

i have one in beijing. if i stay on here i will get one for each room

do not use auto settings

Beat me to it - this is what I was going to recommend.
Link there to this one as well - http://www.myhealthbeijing.com/...mb-diy-air-purifier/ - basically, get a HEPA filter and a fan and you're good to go.

What type of heating/cooling system do you have in your house? If you have a ducted heating/cooling sytem, you would be better of with a bi polar ionization machine tied into your ductwork. Will clean the air in your entire house rather than just particular rooms. Not talking about something like the ionic breeze. Several commercial companies make high quality ionizers that don't produce ozone. The ionizers will also kill mold and viruses. Hepa filters won't do that.

What the beijing report stated was correct. For better filtration, all you really need is a very good filter and a fan big enough to handle the resistance from the filter. The more efficient the filter 85%, 90%, 99.99%, the tighter woven the fabric is and the greater resistance to air through it. So you need a fan capable of overcoming that resistance. You also need a fan large enough to give you enough air changes per hour in your room.

We have a central heating/air system with ducts. The system doesn't run much in the mild weather, so we would have to have the fan run constantly or remember to run it so that it exchanged the air. Still, it looks interesting and I have started reading about the bi polar ionization systems.

I did my research many years ago, I just actually bought a second one of these. Like anything I go a little nuts on research and a big part of my decision was based on Consumer Reports along with some efficiency calculations I did - I do try to be very green. Thankfully being green is also good for the pocketbook. This isn't the sleekest looking thing. I have had BlueAir and other units, but for 300 sq feet you can't beat this one. It is True Hepa of course.

Whirlpool AP25030K

also recommend

3M Ultragen 2800 - for the whole house. Yes your blower fan will have to work a tiny bit part harder, but I do feel ultimately the blower fan will be better protected by much better filtration and ultimately last longer

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For the best filtration, you should run the fan constantly. If your dogs are your problem, they are shedding hair and dander all day. Running the fan only part of the time only helps part time.