I will agree that any improvement to fill in holes is a great friend, however, you can not fill make a home sealed tight.Borax and sugar doesn’t always work. Some ants want sugars and simple carbs, other times they want protein. Ive seen them walk right past a fresh terro bait to get the peanut butter some homeless dude left on sidewalk.
For inside the house- caulk and spray foam are your friend here.
No contact insecticide for you... I'm not sure on the amount ( not a scientist) but I do know that the 1 of the Active ingredient in FUSE is great for your shrubs (insecticts) and the other does really well with house pests/bugs.Just curious, crush an ant with your fingers then smell them. If it has a faint smell of fermented coconut then you probably have odorus house ants. I'm not an ant or bug expert, just know my problems. They are a multi-queen colony and you may want to avoid fast acting treatments and raid sprays.
I use "fuse" concentrated spray and Advion Ant, both from amazon. Have had less bugs since I dropped pest service and started doing this.
Yes this is for outdoors, it is a contact insecticide(if I read it right). If you enjoy bees then you may want to stray from this one, or be carefully on where you are spraying.Is that outdoor too?
And as far as ants are concerned you will always want to look for baits or non contact insecticides. The idea is to be able to treat the foragers and have them bring it back to the queen to take care of the entire colony. If you use a contact spray, yes you will be ride of them quickly, but they will also return quickly as well.