
Should You Turn Your Heat Down When You're Not Home?
The cost of heating a home constitutes a significant portion of annual energy expenses, with space heating accounting for about 45 percent of an average U.S. home's energy bills. Households utilizing natural gas spend approximately $950 per year on heating, while those relying on oil face an annual cost of around $2,115. During warmer months, cooling costs represent roughly half of a household's energy expenditure. Consequently, many individuals seek methods to reduce these costs, including adjusting thermostat settings when away from home.
A common misconception suggests that a heating unit works harder to warm a cold house than to maintain an already warm temperature. However, the U.S. Department of Energy clarifies that it requires more energy to sustain a constant temperature than to reheat a space after the thermostat has been lowered. Heat naturally dissipates from warmer areas to colder ones. When a home is kept at a higher temperature, heat continuously transfers from the interior to the exterior, even in well-insulated properties. Conversely, when the internal temperature is reduced, the rate of energy loss decreases. This means that the longer a house remains at a lower temperature, the more energy is saved compared to maintaining a higher, constant temperature.
This principle also applies to cooling. A higher internal air temperature, above typical levels, results in a slower loss of energy. This slower energy loss makes it more efficient to recool the home upon returning or waking. While lowering the thermostat is beneficial, completely shutting off the furnace or air conditioning unit, especially for extended periods, is not advisable. Allowing a house to become too cold risks pipes freezing, while excessive heat can damage wood floors, cabinets, and other surfaces due to condensed air. For optimal savings and safety during winter, it is recommended to set the thermostat to approximately 68 degrees F (20 degrees C) when occupied and lower it to about 55 degrees F (13 degrees C) when away or asleep. In summer, keeping the house warmer than usual when unoccupied and setting the thermostat to around 78 degrees F (26 degrees C) otherwise is advised. The U.S. Department of Energy estimates that homeowners can save 5 to 15 percent annually on heating costs by setting back their thermostat by 10 to 15 degrees for eight hours a day.
Beyond thermostat adjustments, several other strategies can enhance energy efficiency. Investing in a programmable thermostat allows users to schedule temperature changes, aligning heating levels with daily routines, such as warming up before waking or returning home. Most programmable thermostats offer the ability to store and repeat daily settings, with manual override options. However, for homes with heat pumps, programmable thermostats may not be as effective, and could potentially increase costs, as heat pumps operate most efficiently when running at a constant, moderate level.
Regular maintenance of heating and cooling systems is also crucial. This includes routinely cleaning and replacing filters, removing dirt, and addressing corrosion on HVAC units. Ensuring that vents and radiators are unobstructed and that air ducts and heating pipes are properly sealed further contributes to energy efficiency. Additionally, some research suggests that maintaining lower indoor temperatures, specifically in the low 60s, can increase the body's metabolism, leading to greater calorie expenditure, offering a health benefit alongside energy savings.
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