A Lennox furnace costs between $3,000 and $10,000 fully installed, depending on the model, efficiency rating, and your home's size. The unit alone generally runs from $1,100 to $5,800, with an additional $1,500 to $4,000 required for professional installation labor.
The average Lennox furnace cost installed ranges from $3,200 to $10,000, depending on the furnace series, home size, and installation complexity.
Yes, you should highly consider replacing a 30-year-old furnace. Most furnaces have a lifespan of 15 to 20 years. At 30 years old, your system has likely outlived its expected life. It is operating at a much lower efficiency than modern units and presents a significantly increased risk of catastrophic breakdown or dangerous carbon monoxide leaks.
Lennox® furnaces are some of the most efficient and quietest heating systems you can buy*. They're engineered for perfect warmth and savings.
A Lennox furnace typically lasts 15 to 20 years. With premium, high-efficiency models and rigorous, routine maintenance, they can sometimes reach 20 to 25 years.
The $5,000 rule is a guideline to help homeowners decide whether to repair or replace their HVAC system. You multiply the age of your unit by the cost of the needed repair. If that number exceeds $5,000, replacing your HVAC system is often more cost-effective.
The best time to buy a furnace is during the off-season, specifically late spring (April-May) or early autumn (September-October), when HVAC companies are less busy and offer lower prices, rebates, or promotions. Purchasing in these shoulder seasons ensures faster installation times and better negotiating power compared to winter peak season.
HVAC Energy Efficiency
Even when compared to other top-of-the-line options, like Carrier, Lennox comes out on top. This leads to energy savings which leads to budget savings. Though other HVAC systems may be cheaper, the long-term energy savings provided by Lennox help make up the difference.
The "best" furnace depends on your climate, budget, and long-term priorities. Overall, Trane and Carrier are top-tier leaders, Lennox provides unmatched energy efficiency, and Goodman/Amana offer the best value and warranties.
5 Warning Signs It's Time for Furnace Replacement
Credit Calculation
The furnace tax credit equals 30% of your total qualifying costs, including both equipment and installation expenses, up to a maximum of $600 per furnace. Homeowners can claim 30% of the costs for upgrading heat pumps, with a maximum cap of $2,000.
The heat exchanger is often considered the most costly part of a furnace to repair or replace. It is a critical component that transfers heat from the combustion process to the air that circulates throughout your home. Over time, heat exchangers can crack due to the constant heating and cooling cycles they undergo.
Yes HVAC prices have steadily increased over the past few years, and 2026 is no exception. These increases are affecting everything from entry-level systems to high-efficiency units, making it more expensive than ever to install or replace HVAC systems.
Lennox furnaces are primarily manufactured in North America, with the majority of production taking place in the United States. The brand's major HVAC and furnace production facilities are located in Marshalltown, Iowa, Stuttgart, Arkansas, and Saltillo, Mexico.
Your experienced Lennox Dealer knows how to check the operation of your HVAC equipment under all kinds of conditions and during every season. For maximum system effectiveness, it's advised that you have at least two tune-ups per year — one for your heating system and one for your cooling.
When choosing a furnace, the best brand depends on what you prioritize: reliability, high-end efficiency, or budget-friendly value. Based on industry consensus and consumer ratings, the top three furnace brands are Carrier, Trane, and Lennox.
A furnace with an AFUE rating of 95% will require significantly less fuel (natural gas) to heat your home than a unit with an 80% AFUE rating. While higher-efficiency furnaces tend to cost more upfront, they allow homeowners to save money on heating costs every year.
7 Signs You Need HVAC Repair
Lennox purchases parts from the United States, and globally, including our iComfort thermostats manufactured in China which are designed by Lennox as an integral component of our complete HVAC systems (i.e. furnaces, air conditioners and heat pump systems).
Below are some of the best furnace brands for different homeowner priorities:
Cost of Lennox Air Conditioners
Shop around. Getting competitive bids from several contractors will save you money. For large installation jobs, it's common for company-to-company price differences to exceed $1,500 for the same equipment and work. Even for smaller installation jobs, prices vary considerably.
You should probably Replace if: [ ] The repair costs more than 50% of a new unit. [ ] The furnace is over 15 years old. [ ] You have had to repair it more than once in the last 2 years.
Set your thermostat to 𝟔𝟖 ∘𝐅 while awake and home. For maximum efficiency and savings, lower the temperature to 𝟔𝟎 ∘𝐅 – 𝟔𝟒 ∘𝐅 while sleeping or when away from the house for the day.