Sylvie Willis
Thermostats are devices that allow users to control the temperature in buildings. They are often used in conjunction with heating systems that run on fossil fuels such as natural gas, propane, and fuel oil. In the United States, about 50% of homes use natural gas for heating, while propane and fuel oil are more commonly used in rural communities. Modern fossil fuel furnaces are equipped with electronic thermostats, and the heating cycle begins when the thermostat detects that the air temperature has dropped below the desired level. While thermostats can help save energy and reduce costs, the use of smart thermostats in combination with electric heat pumps can lead to peak power demands in the early morning, potentially requiring the use of fossil fuel-powered generation.
| Characteristics | Values |
|---|---|
| Use of fossil fuels | Fossil fuel-based heating systems are controlled by a thermostat |
| Thermostat control system | Consists of three wires: green (manual fan control), red (24-volt AC power), and white (main heat control signal) |
| Troubleshooting | If the power is available at the transformer but not at the thermostat, the problem lies with the thermostat |
| Fan control system | Automatically turns on the fan when the combustion plenum reaches a predetermined temperature (older furnaces) or after a set time (newer furnaces) |
| Energy savings | Programmable thermostats can save energy and money by adjusting temperatures according to a schedule |
| Environmental impact | Smart thermostats can inadvertently strain power grids and lead to increased consumption of fossil fuel-powered generation |
| Carbon capture | Global Thermostat's technology aims to reduce carbon emissions by capturing CO2 from the atmosphere |
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What You'll Learn
Thermostats can be powered by electricity
Electric HVAC systems are powered entirely by electricity and include baseboard heaters, fan-forced heaters, in-ceiling radiant heat, and electric in-floor heating. Ductless mini-split heat pumps are also electric systems but are controlled by IR signals from a handheld remote or a smart device.
Smart thermostats are electric appliances that can help consumers save energy. However, when used in combination with electric heat pumps, they can result in early morning peaks in power demand, as thousands of smart thermostats in a single city can automatically turn up the heat before people wake up. This can lead to a higher consumption of power when renewable energy is scarce, potentially hindering the integration of renewables into the grid.
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Fossil fuels are used for home heating
Fossil fuels are still used for home heating in the US, though there is a push to electrify homes. In 2020, retail electricity purchases accounted for about 44% of residential sector end-use energy consumption. Natural gas, which is a fossil fuel, was used in 58% of homes in 2020, making up about 43% of residential sector end-use energy consumption.
The use of fossil fuels for home heating varies across the country. In the South, many rely on electricity for heating due to historical government funding and mild climates. In the West and Midwest, natural gas is the most common heating source, while the Northeast relies heavily on fuel oil. Propane, another fossil fuel, is used in rural areas without easy access to a natural gas network.
The transition to electrification is challenging, especially in colder regions where electric heating was historically limited to inefficient or ineffective options. Natural gas and liquid fuels like propane were often the only viable choices. Additionally, the cost of replacing millions of fossil fuel furnaces is a significant barrier to electrification.
Smart thermostats have been identified as a potential complication in the transition from fossil fuels. While they can help consumers save energy, when combined with electric heat pumps, they can cause early morning peaks in power demand when renewable energy is scarce, potentially requiring the use of fossil fuel-powered generation.
Overall, while there is a growing trend towards electrification, fossil fuels continue to play a significant role in home heating in the US, particularly in certain regions and during peak demand periods.
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Natural gas is a fossil fuel
The extraction and consumption of natural gas have become a major industry, with deposits found in underground geological formations, often alongside other fossil fuels like coal and oil. The search for natural gas involves geologists studying the structure and processes of the earth through seismic surveys, which help identify potential drilling sites. Once a site is deemed promising, exploratory wells are drilled to test the quality and quantity of natural gas available. If the results are favourable, production wells are drilled to extract the natural gas.
Natural gas has been referred to as "natural" since the early 1800s to distinguish it from coal gas, the dominant gas fuel at the time. However, the term "natural" may give a false impression of safety regarding its impact on humans and the environment. To address this concern, some organisations prefer the terms "fossil gas" or "methane gas" to emphasise its role in contributing to climate change. Natural gas is indeed a significant contributor to air pollution, water pollution, and the release of greenhouse gases, particularly methane, into the atmosphere.
The use of natural gas as a fuel source has been widespread, with about 50% of homes in the United States relying on it for heating. In recent years, the combination of smart thermostats and electric heat pumps in homes has been found to complicate the transition from fossil fuels. While smart thermostats help consumers save energy, the simultaneous use of electric heat pumps can lead to early morning peaks in power demand, requiring the dispatch of fossil fuel-powered generation. This dynamic can hinder the integration of renewable energy sources into the grid and challenge greenhouse gas reduction efforts in certain states.
Natural gas has been a prominent energy source for heating, cooking, and electricity generation, but its extraction and consumption contribute to air and water pollution, climate change, and the release of greenhouse gases. The transition from fossil fuels to renewable energy sources is essential to mitigate these negative environmental impacts.
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Gas furnaces have combustion chambers
Gas furnaces are equipped with combustion chambers where fuel is burned and converted into heat. The heating cycle begins when the thermostat signals that the air temperature has cooled beyond the desired level. Once the thermostat signals the ignition source, the gas and air in the combustion chamber are ignited and begin to heat.
Older gas furnaces use a pilot light to ignite the furnace, while newer models use a 'glow stick' made of silicon nitride. The combustion chamber is connected to a heat exchanger that absorbs heat from the chamber and uses it to warm the air inside. When the air reaches a certain temperature, an electric motor turns on a fan that moves the warm air into the home's heating ducts and out into the rooms.
Category I furnaces are considered natural or atmospheric draft furnaces as they rely on high flue temperatures to draw exhaust gases out of the flue. They have very low Annual Fuel Utilization Efficiency (AFUE) ratings, usually 70% or less. Newer Category I furnaces are equipped with an induced draft fan that pulls air through the combustion chamber, although they still rely on flue temperatures to lift the combustion gases.
Category III furnaces are standard- to high-efficiency, non-condensing, forced-draft appliances. They are equipped with a combustion fan located before the burner to push air through the combustion chamber and out of the flue vent. The flue stack pressure is always positive due to the continuous operation of the draft fan. Most Category III furnaces are oil furnaces with gun-type burners that atomize fuel oil for a more efficient burn.
A properly functioning combustion chamber should have minimal debris. Signs of a problematic combustion chamber include a layer of soot or ash, indicating improper combustion and the potential presence of toxic gases. A crack or broken seal in the chamber could also allow poisonous carbon monoxide to enter the living space.
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Smart thermostats can complicate the transition from fossil fuels
Smart thermostats are intended to give homeowners more control over their energy consumption, and they can help consumers save energy. However, smart thermostats can also complicate the transition from fossil fuels to renewable energy sources.
As more people install electric heat pumps for home heating, thousands of smart thermostats in a single city can inadvertently work in tandem. After being programmed by their algorithms to automatically turn up the heat before people wake up, this causes consumption of power to peak when renewable energy is scarce. This requires the dispatch of fossil fuel-powered generation, hindering the integration of renewables into the grid and undermining greenhouse gas reduction efforts. For example, a study by Cornell researchers found that average energy use among 2,200 New York homes rose by 40% around 6:05 am, an hour before daylight.
The use of smart thermostats can also strain power grids in the morning before solar energy is available. About 40% of US households now have smart thermostats, and while consumers can use the technology to manage their power bills and consumption, it can also cause power demand peaks that are difficult to manage. This is especially true in cold-weather states such as New York, where a large share of carbon emissions come from heating.
To address these challenges, researchers suggest that utilities and regulators could use incentives to spread out energy use for heating over time. More consumer education and attractive financial rewards could encourage customers to give up some of their thermostat independence. Another solution is to consider heating electrification when planning renewable and energy storage resources. For example, wind generation could be used to supply renewable electricity during high heating demand times.
Overall, while smart thermostats have the potential to help consumers save energy, they can also have unintended consequences on the transition from fossil fuels to renewable energy sources. It is important for policymakers and utilities to consider how smart thermostats and electric appliances will affect the grid to ensure a smooth transition to a more sustainable future.
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Frequently asked questions
A thermostat is a device that regulates temperature. It does so by signalling the ignition source, which lights the gas and air in the combustion chamber, heating it.
Thermostats are not powered by fossil fuels. They are powered by electricity. However, they are often used in conjunction with fossil fuel heating systems, such as gas furnaces.
In a fossil fuel heating system, the thermostat signals the ignition source when the air temperature falls below the desired level. This ignites the gas and air in the combustion chamber, starting the heating cycle.
Yes, thermostats can help reduce fossil fuel consumption by allowing users to adjust the temperature according to their needs. For example, you can save energy by setting the thermostat to a lower temperature while asleep or away from home. Additionally, programmable thermostats can automatically adjust the temperature at preset times, helping to optimise energy usage.
