Along with VirginiaTam's suggestion, I'd add plantings of wormwood (Artemisia) around the edges of your house. As the plant's common name indicates, it was used in a range of insect-control applications. It was a common practice, in Colonial America, to plant artemisia around the foundation of wooden buildings to deter or prevent insect infestation.

Pennyroyal might help too--I know it repels fleas and some other insect pests. Both plants contain bug repellant compounds. Just be aware that pennyroyal should be used with caution--I've heard it should not be handled by children or pregnant women. Artemisia can, as far as I know, be safely handled by anyone.