Propane Furnaces

Why Choose a Propane Heating System?

For many homeowners, the decision to install a propane furnace is driven by geography and infrastructure. 

Daniel Donahue, general manager of Mullen Refrigeration Service in Latrobe, Pennsylvania, says propane furnaces are often a practical heating solution for homeowners in rural areas where natural gas service is unavailable.

“Propane typically makes the most sense for homes located outside natural gas service areas,” Donahue said. “It allows homeowners to still get the strong, comfortable heat output associated with a gas furnace.”

However, choosing propane isn't just about availability—it is also about fuel characteristics and system performance. Propane contains about 91,452 BTUs per gallon, while the U.S. average heat content of natural gas is about 1,036 BTUs per cubic foot.

 While electric options like heat pumps or electric furnaces are common in milder southern climates, homeowners in colder regions often prefer the distinct feel of gas heating. A propane forced air furnace delivers a warmer heat output from the registers compared to electric counterparts, creating a cozy environment rapidly.

“In some situations, propane can be a better option than electric baseboard heating or certain heat pump systems that may struggle during extremely cold weather,” Donahue said. “Compared to oil heat, propane is often considered a cleaner-burning and more efficient option as well.”

Propane Furnace Costs and Operating Expenses

Investing in a new heating system involves two financial components: the initial furnace installation and the ongoing fuel costs.

Installation Cost of a Propane Forced Air Furnace

The price of a new propane heating system varies based on furnace size,  efficiency ratings, and installation complexity. The cost of converting or installing a propane furnace can also vary depending on whether a conversion kit, propane storage tank, venting changes, or other site-specific work is required.

To get a precise number, you should contact your local Carrier dealer who can assess your specific heating needs. For broader context on pricing, visit our guide on the cost of a new furnace.

Fuel Costs for LP Furnaces

While propane can provide substantial heating energy, the cost of propane varies by location and season. For example, the U.S. average residential propane price was $2.674 per gallon during the week of March 30, 2026, according to the U.S. Energy Information Administration.

Because propane is typically purchased by the gallon while natural gas is commonly billed by therms or cubic feet, homeowners should compare fuel costs based on the amount of usable heat delivered rather than the price of a single unit of fuel. Actual heating costs also depend on furnace efficiency, local fuel prices, climate, and household heating demand.

Efficiency of a Propane Forced Air Furnace

Carrier propane furnaces can offer the same range of efficiency technology as Carrier natural gas furnaces because Carrier natural gas furnaces can be converted to use propane.

• Standard Efficiency: The Department of Energy requires a minimum of 80% AFUE (Annual Fuel Utilization Efficiency). These units use a pilotless ignitor to eliminate waste from standing pilot lights.
• High Efficiency: To reach 90% AFUE or higher, furnaces utilize a secondary condensing heat exchanger.
• Premium Efficiency: Carrier high-efficiency furnaces can achieve up to 98.5% AFUE. These systems often feature intelligent, communicating technology that adapts to your home's needs for superior comfort and energy savings.

How Long Does a Propane Furnace Last?

A high-quality Carrier propane furnace can typically last 15 to 30 years with proper installation and maintenance.

The longevity of your forced air furnace depends on correct sizing during installation and your dedication to maintenance, such as routinely changing furnace filters. Neglect can shorten this lifespan, while proactive care can extend it. For more insights on maximizing your system's life, read our article on “how long does a furnace last?”.

Converting from Natural Gas to Propane

Can you convert a gas furnace to propane? Yes. Carrier natural gas furnaces are designed to be convertible to propane, but the conversion must be performed by a qualified professional.

This is not a DIY project. A qualified HVAC technician uses a specific conversion kit to replace the natural gas burner orifices with ones calibrated for propane. The process also involves installing spoiler screws in the burner and adding a low gas pressure switch. Carrier states that its natural gas furnaces, including 98% AFUE models, are engineered for propane conversion.

Service and Maintenance for Your Propane System

Carrier recommends routine furnace maintenance is the most effective way to protect your propane heating system and help maintain reliable performance.. A simple task like inspecting and replacing your furnace filter can prevent dust buildup that restricts airflow. Poor airflow forces the blower motor to work harder, reducing comfort and potentially causing the system to overheat.

Schedule an annual furnace tune-up with your local HVAC professional. They will adjust critical components to ensure your propane heating system operates at peak efficiency, helping you avoid inconvenient and expensive furnace repairs later.

Throughout the year, check for other signs furnace maintenance is needed, such as unusual noises, inconsistent heating, rising energy bills, weak airflow, short cycling, or unexplained dust and dry air in your home.