I'm presuming that you don't want to use a DEET repellant, for whatever reason? Just know that DEET *is* the most effective repellant for mosquitoes, but there are some less effective non-deet alternatives.
Mosquitoes tend to dislike the smell of fabric softener. Tucking dryer sheets into clothing (belt loops, sock tops, etc.) works fairly well, but the odor needs to be pretty strong, and you end up looking a bit odd. You can also buy bracelets that are saturated with geraniol (oil of geraniums); those also work well, but the smell can sometimes cause headaches; I have DS wear the bracelet on his ankle instead of his wrist.
Another thing that has been shown to be somewhat effective is eating *lots* of garlic. Apparently mosquitoes do not like the way it makes you taste, and will not feed as long if your blood tastes of it. I eat tons on garlic, and they seldom bother me. Of course, I don't react much to their saliva, either, so I can be bitten and not really notice it much.
As to your house, you need to prevent and treat. First off, eliminate any and all outside standing water; no ponds, pools, birdbaths, fountains, pet dishes, or open drains. No heavy lawn watering, either. Treat all your drains frequently with larva-killing crystals, so that any eggs laid in the drains will not hatch out. Stay indoors at dusk, when mosquitoes are most active.
