What do it means when theres a horsefly in your house?

usually if you have a dog or live on a farm with livestock. also, make sure that you don't have any trash or food just laying around. clean the counter tops and check Windows and caulk around doors for a way for them to get in. you can by fly tape, insect repellent that kills them, or an old fashioned flyswatter to get rid of them. good luck:)