Use fogger each year
http://www.drugstore.com/products/prod.asp?pid=166552&catid=9619&brand=43354&trx=PLST-0-BRAND&trxp1=9619&trxp2=166552&trxp3=1&trxp4=0&btrx=BUY-PLST-0-BRAND
Also you can spread ant-repellant(granular) around the house each spring.
Both are available at HD pest control section.
Also you can spread ant-repellant(granular) around the house each spring.
Both are available at HD pest control section.