Hi, 

We actually don't recommend using pesticide for ants outside. Ants in the landscape are great garden predators, helping to suppress other pests.

Any type of perimeter spray insecticide is broad-spectrum (not ant-specific) and can potentially harm any insect/arthropod that encounters it, so beneficial spiders or other predatory insects could be killed.

You can seal gaps/cracks in exterior walls and repair any worn-out door/window weather-stripping if there is a concern over ants getting in the house. You can also use bait station traps indoors if needed if any wander into the house regularly. Searching for a borax/sugar water solution works well and is inexpensive way to deal with them inside. You can save small containers or jar lids to use a little of the solution in and leave in window corners or along their path on the floor if you notice some inside. 

https://extension.umd.edu/resource/ants-indoor-insects/

Emily