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Fleas don't survive well in cold environments. Keeping your house as cold as possible while you are not there will force the fleas to migrate to your pets, where they will die. Purchase an electronic programmable thermostat that can turn your heat down or off while you are at work or asleep. Leave windows wide open while you are out of the house whenever possible. Doing this will keep fleas from hiding inside your cushions, under pillows or under throw blankets. Squeeze the juice out of an orange or a lemon and rub the rind over your pets' fur. Your pet will smell great, and your pet won't be harmed if it licks the citrus juices from its fur. Note that concentrated citrus oil is toxic to pets if licked, so only use the juice never essential oils. You can purchase "beneficial nematodes" from a pet shop, a gardener's supply store or a store that focuses on organic lawn care. Beneficial nematodes consume flea larvae, which prevents the next generation of fleas from invading your home. Don't worry these aren't the nematodes that can cause your pet to have heartworms. Add one teaspoon of vinegar for every four cups of water in the dog's water bowl. As your dog drinks the water, the vinegar gets into their system and make their blood taste bad to the fleas. It will take two to three bowls of water before you start to notice a difference, but it works great once the vinegar gets into the dog's system. There is no scientific evidence to back this method, though some people report having luck.
Keep your home as cold as possible when you are not around. Place covers on your furniture after you treat your house. Rub your pets' fur with citrus. Use natural predators in your yard. Use apple cider vinegar.