Temperatures will be dropping below zero around the state once again tonight. These cold temperatures are increasing the demand for natural gas, and that's means it's getting more and more expensive to heat your home. Natural gas prices have tripled in the last 18 months, as supplies across the United States have failed to match rising demands. Some analysts say prices could go even higher in the next few months. One way to reduce heating costs is through conservation. Dale Sullivan is an energy specialist with Ramsey Action Programs. He says home owners should start off by trying to reduce drafts within the house.