I bought two of the 1 1/2 acre models. I use them in my backyard, and I can say they have really made a difference in reducing the mosquito population. I have a two acre lot with wooded lots all around me. These Flowtrons work, just wish the bulbs had a longer life (about two years). With all the concerns with mosquitos now days, I see these as a good investment, to help you enjoy your outdoor space.