You can try to caulk, etc., but it won't eliminate them, although it may reduce their numbers.

I don't particularly like bugs either, but having someone come into my house to spray pesticides periodically would trouble me a lot more than living with some bugs. When you regularly spray inside, you significantly increase your long term exposure to the potentially serious side effects of these toxic chemicals. I don't care what the pesticide applicator says about safety or that the chemicals are approved for use by EPA...it doesn't mean these products are benign.

I spent most of my career involved with pesticides and other toxic compounds. I'm not a tree-hugging environmentalist, but I've learned enough to avoid any unnecessary exposure. I've seen cases where people were sickened by pesticides inside their houses, or had rashes or allergic reactions; and I know of one couple that died from a high level of spray done by an incompetent applicator. The long term effects, like cancer, are arguable, but the risks aren't zero. My personal belief is that there are enough risks in life without adding avoidable ones to the list.

Hope I'm not coming across as lecturing...I'm just trying to suggest that total bug control has some risks that you may want to consider.