  We've been living with the house AC set on 67 (70 when I really wimp out) for over a week now. I live in one of those neighborhoods where neighbors pop by all the time unexpected, so it's funniest when I see people's reaction to the family in sweaters when they come to the door in tank tops and shorts.
I try to be polite, I offer them a sweater or a blanket, but they don't typically stay long enough when they hear our explanation for the temps. We're determined to battle the fleas without chemicals. John and I have lived chemical free for almost ten years now, with no bug sprays, insect repellant, it's even been years since I've used sun block. We did break down and use a small, hidden container of poison against kitchen aunts once, but that was still a chemical that didn't come into contact with our bodies.
These fleas have been a cantankorous bunch. They're really trying our resolve! But we're nothing if not ideal-driven, and what sets ideals stronger than a good enemy? Fleas have lifecycles about three weeks long. They're extremely clever at surviving. In fact, I've come to think the flea will outlive the cockroach, species-wise. They don't waste energy, they only expend energy on things that will get them food or extend their lineage.
They don't hop around even (chosing insidiously to lay still for hours or days even) until they sense a food host near, via carbon dioxide, warmth, and vibrations. The flea pupae won't hatch out of their eggs, and indeed an adult doesn't even like to lay eggs, unless temperature and humidity are above 70 degrees. So we use our house AC to fool them into stopping their own breeding cycle. This has given us an edge in the battle, but the war still wages on. We set pans of water under nightlights or with candles in their centers at night. The fleas think they are warm bodies and jump toward them and drown.
Our wood floors are a big asset in the battle. They vaccuum and sweep pretty clean, you just have to be sure to empty the bag or dustpan outside so any eggs or fleas don't colonize in your trashcan. The best tool I use against them is duct tape. That's right, the world's most perfect invention has yet another use! I wrap a circle of it on itself sticky-side-out and use that to remove a flea I spot on me or the kids, since pinching it off doesn't kill it (they have amazingly hard and yet flexible exosceletons!).
All the websites say babies will get the most bites, and I see why. Ellie is such a ball of energy (flea read: warmth and carbon dioxide) and vibrations (noisy and rough) that I can just follow her around on my hands and knees. She draws the hiding devils out and I snatch them up with my duct tape. Its best to keep myself and the kids dressed in longsleeves, pants, and socks to prevent bites, and in light colors so I can spot a flea on them right away.
Lavender and tea tree oils irritate the fleas so I put lavender on their skin now and then, and we all use a teatree oil shampoo anyway, I think that helps. We're over half-way through the three weeks that would be the life-cycle we've attacked. I hope we win! 
