Residential grade dehumidifiers are really inefficient and actually kick out a lot of hot air. So my LG that I was using was not only ineffective at lowering humidity to a desirable range, but it would also increase temps by almost 10*. Anyways, I wasn't shopping on square footage but the ability to pull water out of the air efficiently. The one I bought had great reviews and is just a beast, excellent purchase. If you've purchased a residential grade dehumidifier and it's not cutting it, I would highly suggest a commercial grade unit from the company I bought from.