Dust is an allergy trigger for many people, but high-quality, filtration-equipped central-air systems can cut down on the dust in your home and help reduce your allergy symptoms. When buying a new home, make sure to ask the seller if there is a central-air system and make sure it is in working condition. If you already live in a home, you can upgrade your system, but you should note that this may be costly. ecohealthtips.com