Nothing is more effective than the Precor Plus Fogger "Flea Bomb." It uses a synthetic pyrethrin-based insecticide that effectively disrupts a flea's neurological function to kill it. Then, it distributes a residual chemical called methoprene isopropyl that regulates a flea growth cycle, never allowing a larvae to turn into an adult biting flea. One application will effectively treat 750 square feet, so in some cases, you will be able to treat either a room or an entire residence with one can. With a name like "flea bomb," its got to be good.
If you want a flea fogger that uses natural pyrethrins, than Enforcer Flea Fogger will fit the bill. Natural pyrethrins, made from the chrysanthemum plant, are a bit more environmentally friendly than synthetic made pyrethrins. They are mixed with NYLAR, or pyriproxyfen, which is a growth regulator that keeps flea larvae from growing into biting adults. Each fogger covers approximately 500 square feet, and the residual effect will last up to 7 months.
This is probably the best flea fogger you have never heard of, but the Adams 3-Pack Plus Flea Indoor Fogger, 3-Ounce uses the same chemicals as the top rated fogger, so there is no question that it will work. It gives immediate kill with a synthetic pyrethrin ingredient, and keeps on killing for up to 7 months with a methoprene growth regulator. The main difference is in the size of the can, which equates to a smaller room or area size that can be effectively treated, roughly about 300 square feet.
If you have an extremely large room, warehouse, basement area, and want the most coverage, use Virbac Knockout Room Fogger. This spray will treat an approximate 1500 square feet of space, but since it is the most expensive fogger on the list, you'll pay a premium for that. It is made of two synthetic pyrethrin active ingredients, and uses NYLAR as a growth regulator that lasts up to 7 months. According to the EPA, large cans of fogger should not be used in smaller rooms due to a possible explosive situation. Heed that advice when using this bad boy.
From a name you know and trust for all of your pet needs, the Hartz UltraGuard Plus Home Fogger may be the fogger for you. Made of natural pyrethrins, for a more environmentally friendly flea fogging ingredient, it uses NYLAR for up to 7 month residual effectiveness. It will fog roughly 300 square feet, which makes it a good choice as a room sized fogger. This is one of the least expensive foggers available, which makes it the best bang for the buck deal on this list.