To spray the outside of your house for termites, you should use a specialized termite spray containing an active ingredient such as Deltamethrin, Bifenthin, Cypermethrin or Lambda-cyhalothrins. Apply the product to the base of walls, around window and door frames, and on foundation cracks. Be sure to read and follow all manufacturer instructions when using these products to ensure safe use. Always wear protective equipment when spraying insecticides in order to mitigate any potential risks associated with them. Regular inspections of your home should also be done throughout the year in order to identify any new infestations before they cause serious damage.