We’re continuing our series on thermostats by looking at a few common misconceptions about how thermostats and home heaters work. You’ve probably heard someone say some variation of one of these, if not all of them. (I know that I believed at least two of these before I started working here at Cadet.)
We thought this would be a fun jumping off point to look deeper into thermostat issues.
Myth 1: Programmable thermostats will always save you cash.
The fact is simply that buying and installing a programmable thermostat in your home will not automatically result in energy savings and a lower heating bill. The reason why folks often say programmable thermostats save energy and cash is because you can set them to automatically lower the temperature when you aren’t home or are asleep. That can lead to a 5 to 15 percent reduction in energy use according to the Department of Energy. In reality, it’s the behavior that makes the difference, not the technology itself.
The problem with making the assumption that installing a programmable thermostat will automatically result in energy savings is that various studies have shown that many of them are poorly designed and hard to understand. That means most people aren’t using them to their full potential. One study from the Berkeley National Laboratory, says up to 50 percent of programmable thermostats in homes are set on permanent hold status, which basically means they’re just manual thermostats. In fact, questions about energy savings with programmable thermostats led EnergyStar to discontinue its programmable thermostat specification in 2009.
That’s why taking the time to learn how to use your programmable thermostat will pay off in the long run. Even if it is a painful process, you’ll just need to learn how to do it once.
Myth #2: Cranking up a heater will heat a room faster than just setting it to your desired temperature.
Many folks think turning their stat up to the highest temperature available will provide more heat than setting it to a lower temperature. That just isn’t true. Check out our blog post and video on the subject to learn more.
Myth #3: It would take more energy to reheat a room to a desired temperature if it’s lowered when you’re away than it would to keep it at a constant temperature all day.
As we said above, heating systems are either on or off. If you keep your home at a higher temperature all day, your heater will be on more often to maintain that temperature than it would be if you lower it by 5 or 10 degrees when you’re away.
**UPDATE (1/19/2015): After hearing customer feedback, we decided to make a few additions to this blog post. Thanks to everyone who gave us input.
While our answer to Myth 3 is true in many situations, it depends on your home’s construction and what type of heating system you have.
Setting the temperature back while you’re away and asleep with a heat pump can actually use more energy than leaving it on the same temperature all day. If a thermostat isn’t programmed properly, it can use backup or “emergency” heat sources to quickly reheat a room, which use much more energy than the heat pump itself.
The other notable exception is if you have a home that is built with materials that absorb heat well. Those materials can often retain the temperature while you’re away without using much energy at all. They can also take a lot of energy to reheat, which would also jack up that heating bill.