According to the National Propane Gas Association, every day, 8.1 million households use propane gas for home comfort and utility services, including heating, cooling, hot water, cooking, drying clothes, barbecuing, lighting and fueling gas fireplaces. Excluding propane gas grills, residential and commercial use accounts for 45 percent of all propane used in the United States. Of the 107 million households in the U.S., 9.4 million depend on propane for one use or another. Fifty four (54) percent of these households rely on propane for their primary heating fuel. This highly seasonal usage is why propane rates tend to fluctuate.