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Types Of Furnaces (Styles & Benefits)

In this guide you’ll see the different types of furnaces including their styles, benefits, efficiency, cost, and tips on how to choose the right furnace for your home.
Basement with boiler and furnaces for heating Whenever the temperature falls, your furnace kicks in to make you pleasantly warm. Indeed, your furnace is the source that drives your home’s heating system, but keep in mind that it is not a one-size-fits-all unit. The operation of different types of furnaces varies.

This article will lead you through the various types of furnaces, how to select the correct one for your home and other valuable information about furnaces.

What Is A Furnace? 

Empty carport with epoxy flooring, furnace, and doorA furnace is a type of heating system that heats and distributes air around your house. In fact, furnaces are among the earliest forms of heating technologies that are still used nowadays for both commercial and residential uses. Earlier versions used coal and wood to provide heat, whereas newer versions use natural gas, propane, as well as electricity.

Indeed, a furnace is a component of the HVAC system (heating, ventilation, and air conditioning). Whenever you use a regulator to adjust the temperature of a room, you normally turn on the furnace.

The air in the space may be colder than the temperature you set on the thermostat after making a temperature adjustment. This causes the fan to activate, the furnace to turn on, as well as the air to heat up and circulate around the room. Once the air temperature drops below the thermostat setting, the cycle gets repeated.

A furnace does more than just activate a blower to warm the air, though. To guarantee that the air is properly warmed up before it leaves the unit, several mechanisms are applied. Nonetheless, there are different types of furnaces. And although the fundamental operation of these types is the same, they still have distinctive features, costs, and efficiency rankings.

Single Stage Furnace

Basement with single stage furnace, boiler, epoxy flooring, and white wallsA single-stage furnace features only two configurations for the gas valve that supplies the burner during the operating condition: maximum blast and off. They are referred to as single-speed furnaces since, as the name implies, they only operate at one speed. They continually disperse warm air in the atmosphere at the maximum capability of the furnace.

Single-stage furnaces contain only one heat output stage – high. Nevertheless, this type of furnace can be quite expensive for your wintertime energy bills because every time your furnace switches on as it disperses the most significant amount of energy it potentially can.

Benefits

 Due to the simplicity of its structure, this furnace type is the most affordable to acquire.

 A single-stage furnace is typically sufficient for heating a small to the medium-sized, single-story house.

Efficiency: When it pertains to heating a huge or multi-story house, a single-stage furnace may not be that efficient. Since the furnace operates at full capacity whenever it is turned on, the spaces surrounding the vents will heat up rapidly.

Although the remainder of your house’s temperature catches up, your thermostat may assume your entire house has attained your targeted temperature and turn off the furnace abruptly. This causes hot and cold zones in your house.

Numerous homeowners will boost the target temperature on their thermostats to avoid cold areas so that the furnace does not switch off so prematurely. Even though this solves the problem, it causes another – costlier energy expenses.

Cost: The single-stage furnace alone typically costs $1,000 to $1,500, with labor costing another $1,000 to $2,000. High-efficiency models might cost up to $4,000 to purchase and install.

Variable Speed Furnace

Basement with tile wall and variable speed furnaces for heatingA variable speed furnace, unlike a single-stage furnace, pertains to the fan motor in the furnace, not the range of phases your furnace runs through to create heat. The fan motor in variable speed furnaces can operate at varying speeds to manage the amount of hot air distributed around the different types of rooms in a house.

Improved ventilation leads to a more pleasant atmosphere in terms of both humidity and temperature. Additionally, many of the variable speed furnaces on the marketplace are among the most sophisticated in the industry. Although they may be slightly more expensive upfront, the reductions in energy expenses throughout the lifespan of the equipment are easily appreciated.

Benefits

 A variable speed furnace’s motor can continuously run to keep your home’s air circulating even if the furnace is not turned on. 

 Because your air is consistently flowing through the filtration system in your HVAC unit and then being cleared of germs, pathogens, as well as mold spores, this function promotes cleaner and healthier indoor air quality.

Efficiency: Because air is constantly being circulated throughout your house, this superior control over airflow might eliminate the need for the furnace to work very frequently. This can lead to reduced energy consumption and lower monthly electricity bills.

Cost: The price of a variable speed furnace ranges from approximately $2,000 to $5,000. Although this may appear to be a hefty cost to pay, the unit’s efficiency will indeed provide an incredible return on investment over time.

Electric Furnace

Basemwnt with electric furnace for heating and attached to metal pipesIf your home does not include a natural gas line, you can opt for an electric furnace alternatively. The heat that is transferred to the air is provided by electric heating components in these systems. Electric furnaces are typically less costly to install and smaller in size than other furnaces, making them easier to integrate into certain types of garages or basements. 

The processes for an electric furnace are the same as those for a gas furnace. When the temperature falls below the temperature established on the thermostat, the system switches on.

An electric furnace is distinguished by the application of an electric motor to push air through and away from the furnace. When the air temperature falls below the minimum, the coiled parts of the wire generate electric currents that heat the electric heater. The air is forced over the heating components through a filtration system and out into the surroundings by a fan.

Benefits

 The standard electric furnace is a very long-lasting option, which can be inherited by your upcoming family generations. It normally lasts 20 to 30 years. 

 An electric furnace does not emit dangerous gasses such as carbon monoxide.

 There is no dust or ash to bother when using an electric furnace as there is no combustion, making regular maintenance convenient.

Efficiency: Since there is zero fuel consumed, all electric furnaces obtain an Annual Fuel Utilization Efficiency (AFUE) value of 100%. Usually, electric furnace types use a heat-releasing technique that does not dry the air as quickly as a gas furnace does, allowing your indoor humidity levels to remain consistent and pleasant.

Cost: The costs for a basic electric furnace can vary from $900 to $1,500. A high-quality electric furnace, on the other hand, might cost between $1,500 and $6,000. Total expenses vary depending on localized labor rates, brand selection, and a few other considerations. Electric furnaces, nonetheless, have higher operating expenses than gas furnaces.

Natural Gas Furnace

Basement with wood plank walls, ceiling, and natural gas furnaceThe natural gas furnace primarily uses gas that is piped in from the municipal lining and is currently the most widely known type of furnace in houses nowadays. The gas streams along a burner burn to produce heated combustion gasses.

This boosts the temperature of air circulated by fans through the ducting. Gas furnaces provide consistent heating and are inexpensive to operate due to the low cost of gas.

Inside the combustion zone of a natural gas furnace, high-quality air is kept separate from low-quality waste. The heated air is then discharged into the environment. Once the air cools, it is forced into the furnace and reheated in a similar manner.

Benefits

 If your power goes out, you may still heat your home using a natural gas furnace, keeping you cozy while you are waiting for the power to return. This is not only crucial for your pleasure but is also a good preventative measure for your home plumbing system.

 Natural gas is often less expensive than any other fossil fuel for residential heating. This is achieved due to the efficiency of modern natural gas furnaces.

Efficiency: The vast majority of natural gas furnaces can be up to 98% efficient, resulting in the lowest possible projected heating bills. Plus, natural gas produces almost minimal carbon monoxide when used in a correctly maintained and working heating system.

Cost: The usual installation cost for a natural gas furnace is around $3,000 to $10,000, while a high-efficiency type, or combination heater & air conditioner unit may cost more. These versions are more expensive, but you will save money on energy expenditures over time.

Modulating Furnace

Basement with modulating furnace for heatingA modulating furnace has a burner that gradually regulates the amount of fuel burnt. In comparison to standard single-stage gas furnaces, the modulating gas valve, when combined with a variable-speed fan, offers exceptional efficiency and affordable heating performance.

Whenever you use a modulating furnace, both the gas valve and the compressor fan are continuously changing to maintain the temperature you want inside your home. 

Benefits

 Modulating furnaces work optimally at maintaining a constant temperature around your home since there are quite many settings accessible.

 Modulating furnaces typically spend a significant amount of time working at an extremely low setting. This entails using reduced fuel and lowering the fan setting.

A lower fan setting indicates that air is moving at a reduced pressure throughout your system. Slower air movement usually enhances the efficiency of your furnace filter and the quality of your indoor air.

Efficiency: Modulating furnaces are more energy-efficient and have better temperature regulation than single-stage furnaces. Modulating furnaces can contain a multitude of stages and are very customizable.

Using this type of furnace, you can prevent short-cycling your system, which reduces fuel consumption and stress on the furnace. This offers long-term savings in all places: reduced bills, minimal maintenance, as well as a furnace that lasts longer.

Cost: Modulating furnaces are not that affordable, with prices ranging from $5,000 to $7,500 for both acquisition and installation. Nevertheless, because of its lower operating costs, a modulating furnace can eventually compensate. To begin with, switching to a modulating furnace eliminates the need to tiringly maintain an outdated furnace, therefore decreasing maintenance expenses.

Propane Furnace

Basement with concrete tile wall, epoxy floors, propane furnace, boiler, and small window Propane furnaces operate by turning propane into a gas. Once a heat converter reaches a predetermined temperature, a fan, similar to that found in an electric furnace, blows air over it. The newly heated air is blown out into the environment.

Benefits

 Propane furnaces have a lengthy lifespan, lasting around 15 to 20 years. They can, nevertheless, endure even longer if properly cared for.

 They are also simple to maintain because propane burns cleanly. You will not be bothered about soot or overheated electrical components with these furnaces.

Efficiency: A propane furnace is a low-energy furnace that works on propane gas. These furnaces are mostly recommended by experts since they outlast most types of furnaces in terms of endurance, cost-efficiency, and simplicity of use. A high-efficiency propane furnace has an efficiency rating of 90 to 98%.

Cost: The cost of setting up a propane furnace varies based on the size, quality, size of your propane tank & house. A low-end propane furnace costs about $2,200 on average in the United States. A regular propane furnace, on the other hand, costs roughly $4,000, whereas a high-efficiency furnace costs around $5,800.

Oil Furnace

Basement with white brick walls, boiler, and oil furnaceThe thermostat acts as the beginning station for an oil furnace. The mechanism is activated when the temperature falls below the temperature you preset on the thermostat. It uses an oil tank to heat the air. The oil is purified and transformed into a spray that is applied to the burning chamber. It then begins to heat.

As it passes over the heated burning chamber, the air that is going to be released into the house at the finish of the procedure heats up. The air is then discharged back into the atmosphere after the process of passing over the chamber is completed.

Benefits

 Oil is biodegradable, toxic-free, and free of cancer-causing substances. In reality, oil furnaces are among the cleanest methods of burning. Modern oil burners emit very little smoke or flammable discharge.

 Oil is a non-explosive resource that will not burn unless it is geared up to 140 degrees, therefore there is very minimal possibility of it igniting. Whenever an oil furnace seems to malfunction, it will generate straightforward warning signs such as smoke, smells, or soot.

Efficiency: Oil furnaces produce the fiercest flames, which implies that oil heats your house more quickly while using less fuel. Oil produces more heat per unit of energy than other sources. Switching to a high-efficiency furnace can boost the efficiency of your heating system by 28 to 30%.

Cost: For the unit itself, the usual oil furnace costs around $500 to $2,500. The cost of an oil furnace varies according to size, manufacturer, and energy efficiency. The average overall installation cost will be roughly around $5,700 to $6,000.

Wood Burning Stove

Wooden cabin interior with wood burning stove for heating and brick accent wallThe wood in a firebox within the unit powers a wood-burning stove furnace. These furnaces operate similarly to gas and oil heating units, and some have heating elements that may also heat a home’s water.

Indoor versions with stunning glass firebox doors that resemble fireplaces are also available. Fans, duct work, and heat converters are also used in a wood-burning stove furnace to transfer heat.

Benefits

 You must have a consistent supply of wood if you operate a wood-burning furnace. Fortunately, a lot of manufacturers provide efficient wood transportation services to make this simpler, which makes it beneficial to your wood-burning furnace maintenance.

 In comparison to other forms of heating systems, today’s modern wood-burning furnaces are incredibly efficient and can lead to significant savings.

Efficiency: Wood-burning furnaces are approximately 70 to 80% efficient. These furnaces also have lower operating costs than standard gas and electric furnaces.

Furthermore, because wood is a renewable and long-term resource, wood-burning stone furnaces are ecologically friendly. EPA-certified devices emit the fewest pollutants and have the least potential to harm the environment.

Cost: The cost of installing wood-burning stove furnaces ranges from approximately $1,500 to $5,000.

How To Choose A Furnace

Basement with brick wall, boiler, and furnace Here are the things you have to keep in mind to help you choose the right type of furnace for your house:

 The size of a furnace varies. Picking the correctly sized furnace is not quite as simple as it seems; the size is determined by how large the space is, how high the ceilings are, as well as other minor considerations.

 The type and size of the furnace you must purchase will be influenced by the location of the space.

 The type and size of a furnace are also affected by the surrounding climate, so you should be knowledgeable about the usual climate in your region.

 You must be aware of how much it will cost you in the coming years to maintain and repair the furnace.

 Inquire with the professionals about any issues that may arise as a result of using a furnace.

Furnace Placement

Living room with furnace, wood floors, couch, television, pendant lights, door, indoor plant, and TV stand Basements: Basements are ideal locations for furnaces. The system is positioned out of sight while still providing appropriate space and ventilation. The only requirement for this is that the furnace should be placed above ground level to protect it from unexpected basement floods.

 Garages: Most types of furnaces are installed in garages. The garage in numerous modern homes is constructed with a specific recess that stores the furnace without compromising parking space.

 Huge Laundry Rooms: Furnaces and other significant types of appliances should not coexist in such a little space. Nevertheless, in bigger houses, the furnace may be installed in a massive laundry room.

 Attics: The furnace can be placed in the attic crawl spaces in houses that have space constraints.

 Utility Spaces: Some houses, particularly those without the garages or basements, have a separate space in the central core of the home that can accommodate the furnace.

What Size Furnace Do I Need? 

Furnace for residential properties and heating needsDepending on your environment, the general guideline you can follow to know the right size of furnace you need is around 30 to 60 BTUs per square foot. (BTU – British Thermal Unit – a heat measurement unit) However, climate zones can assist you in determining how many BTUs per square foot you will need for your home.

How Long Do Furnaces Last? 

Furnace in a room with logs, wall heater, and window A properly maintained furnace should last at least 15 to 25 years, but doing regular maintenance and being meticulous with repairs and adjustments will help it survive even longer.

How Much To Replace A Furnace? 

The cost of replacing a furnace can range from $3,000 to $9,000 as it will depend on the type of furnace you own, the size of your house, the efficiency of your replacement furnace, as well as the complexity of the technology. This involves not only equipment expenditures but also labor and licensing charges.

Heat Pump Vs Furnace

Basement with heat pump, boiler, and pipesIn Terms of Operation: Certain types of furnaces typically use oil or gas-based resources to generate heat, whereas heat pumps normally use electricity to pull heat from outside air, even frigid air, and transport it within. Heat pumps generate less heat than furnaces and function optimally in hotter climates due to how they operate.

In Terms of Efficiency: It is difficult to compare the energy efficiency of the different types of furnaces and heat pump units. Heat pumps are scientifically more energy-efficient than furnaces given their ability to transmit more energy than they need, but furnaces are more efficient in terms of keeping your interiors warm.

In Terms of Maintenance: Regular maintenance will help heat pumps and furnaces survive longer and run more effectively. These systems feature air filtration systems that can be simply replaced by the vast majority of homeowners.

A conventional residential heat pump system consists of an outdoor unit as well as an indoor unit that should be maintained and examined once a year. A standard furnace does not usually necessitate an outdoor unit, but it is frequently used in conjunction with a centralized air conditioning system.

In Terms of Space Consumed: Most types of furnaces are normally placed indoors and necessitate at least 30 to 35 inches of clearance throughout all sides. A heat pump just needs 24 to 27 inches of clearance and is normally installed outside. A conventional air-source heat pump system, on the other hand, necessitates an indoor air processor device known as a fan coil.

See more related content in our article about the different whole house humidifier pros and cons on this page.

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