Installing a heating/cooling system isn't something to try when you have a few spare minutes. Even if you are a handy person, it's still not something to try. While there are cost savings to a DIY HVAC system installation--like saving about 50 percent--the tools required for a project of this magnitude are likely not something you have around the house, and they're expensive. Plus, you can't buy refrigerants or some of the components needed without a license. But if saving money is the reason you're considering a DIY install, they are other ways you can achieve heating and cooling cost savings. Purchasing black-out curtains to minimize the sun's powerful rays during the summer can help keep your home's interior cooler. You should also keep your air filter clean based on the manufacturer's suggestions. A clogged filter makes your system work harder than it has to, costing you more money.