The average cost of Lennox furnaces installed in the U.S. is between 3,000 and 9,000+ dollars. This is the price range that covers the furnace unit as well as the labor of installation.
The price varies according to such factors as heating capacity (BTU output), efficiency and stage (single-stage, two-stage, modulating), and model/series (Merit, Elite, or Signature). As an example, a smaller 60,000 BTU single-stage Lennox Merit furnace may be installed at about $3,000 to 4,500, and a high-end 100,000 BTU modulating Signature series furnace may cost about $9,000 to 10,000 with installation.
We have Lennox furnace prices by BTU size, furnace stage type, product series, and models, using national average equipment and installation costs.
Lennox Furnace Prices by BTU (Heating Capacity)
The cost of a furnace is greatly influenced by the heating capacity of a furnace (in BTU/hr). The bigger furnaces produce more heat and are usually more expensive. The average house requires approximately 30 BTUs per square foot of living space, or approximately a 60,000 BTU furnace on a 2,000 sq. ft. house.
A unit with a higher BTU will cost more on equipment and possibly more installation. Average price ranges of Lennox (gas) furnaces of typical sizes are as indicated in the table below:
| Furnace Size (BTU) | Unit-Only Price | Installed Cost |
|---|---|---|
| 60,000 BTU | $700 – $1,900 | $1,900 – $4,900 |
| 70,000 BTU | $800 – $2,000 | $2,000 – $5,000 |
| 80,000 BTU | $900 – $2,200 | $2,100 – $5,200 |
| 90,000 BTU | $1,000 – $2,400 | $2,200 – $5,400 |
| 100,000 BTU | $1,100 – $2,500 | $2,300 – $5,500 |
Practically, a 60k BTU Lennox furnace (which should serve a medium sized house) may cost about 3,000-5,000 dollars installed, and a 100k BTU furnace to serve a bigger house or a house that is not well insulated can cost 5,000 dollars or more.
The size should be selected properly, an oversized furnace will be more expensive and may short-cycle, and an undersized furnace will not be able to heat the house.
Lennox Furnace Prices by Stage (Single-Stage, Two-Stage, Modulating)
A furnace has burner operation modes that are known as the stage of the furnace. Single-stage furnaces only have one level of heat output (100 percent on or off), two-stage furnaces can operate at a low or high setting and modulating furnaces can vary the output continuously to achieve maximum efficiency and comfort.
As a rule, single-stage models are the cheapest (lowest initial cost), and modulating furnaces are the most expensive because of new technologies.
| Furnace Type | Typical Installed Cost |
|---|---|
| Single-Stage | $3,000 – $5,000 |
| Two-Stage | $4,000 – $7,000 |
| Modulating (Variable-Capacity) | $7,000 – $10,000+ |
Simple single-stage Lennox furnaces (usually in the Merit line) may be installed at the low end of the scale at about 3,000 to 4,000 dollars. Two-stage furnaces are more efficient and provide more uniform heating and tend to be slightly more expensive, about $5001,500 more than a similar single-stage furnace.
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According to HVAC professionals, two-stage models are hundreds of dollars more expensive than single-stage models to purchase, although most homeowners consider the added comfort to be worth the cost. Lastly, the Lennox high-end modulating furnaces are high-end furnaces. These variable-capacity units (e.g. the Lennox SLP99V) are capable of operating down to 35 percent of full capacity, which offers excellent efficiency (up to 99 percent AFUE) and comfort. The cost of installation of a modulating furnace usually falls within the range of $7,000 to 10,000+ in the case of the best models of Lennox. The higher price is caused by the more sophisticated burners and controls of modulating furnaces, yet they also provide the best fuel savings in the long run.
Lennox Furnace Prices by Series (Merit vs. Elite vs. Signature)
Product series of manufacturers denote various levels of functions and effectiveness. The three primary lines that Lennox provides are Merit (entry-level), Elite (mid-range), and Signature (top-tier). Overall, the Merit series of furnaces are the least expensive and the most efficient, whereas the Signature Collection are the most efficient and expensive.
Every step up in series is accompanied by more advanced technology (two stage or variable output burners, and higher AFUE ratings).
Such furnaces as Lennox Signature Series high-end furnaces, have variable-capacity modulating burners and 99% AFUE efficiency. The price of a furnace is very different depending on series. As an example, the affordable Merit series is usually priced at $3,000-$5,500 installed, the mid-range Elite series is priced at approximately $4,900-$6,500 installed and the high-end Dave Lennox Signature® Collection is priced at approximately $5,600-$9,500 installed.
Merit models tend to be single-stage and at the low end of the efficiency scale (80%-96% AFUE), whereas Elite models contain a combination of single and two-stage furnaces with up to 96% AFUE. The Signature series furnaces are the most technologically advanced furnaces, all Signature furnaces have two-stage or modulating burners, and efficiencies range up to 99% AFUE in the SLP99V.
Series selection also takes into consideration climate and efficiency requirements. In warmer climates, an 80 percent AFUE Merit furnace can be adequate and is significantly cheaper, e.g. the 80 percent Merit ML180 furnace is approximately 3,500 dollars for the furnace or 5,000 dollars with installation in mild climates.
In cooler regions, homeowners tend to choose a Signature series high-efficiency model to reduce heating costs; the 99 percent AFUE SLP99V, to take one example, costs about 7,000 dollars just to buy the furnace, and up to 10,000 dollars to have it installed. Therefore, Signature series furnaces are the most expensive to buy, but they can be cost-effective to people who require the efficiency.
Lennox Furnace Prices by Model
Lennox manufactures a lot of models under the Merit, Elite and Signature brands. Each model has its own price which is determined by its capacity, efficiency and features. The following are the examples of pricing of particular models of Lennox furnaces (both unit and average installation prices).
These are the examples of the basic Merit units to the high-end Signature units:
| Model | AFUE | Stage Type | Installed Cost Range |
|---|---|---|---|
| SLP99V | 99% AFUE | Modulating | $6,950 – $8,300 |
| SL297NV | 97.5% AFUE | Two-stage | $5,600 – $6,950 |
| EL296V | 96% AFUE | Two-stage | $4,250 – $5,600 |
| ML296V | 96% AFUE | Two-stage | $2,900 – $4,250 |
| ML180V | 80% AFUE | Single-stage | $2,900 – $4,250 |
The above prices are the national averages of a basic installation. The SLP99V is the top-of-the-line furnace of Lennox, a variable-capacity (modulating) gas furnace in the Signature Collection, and the most costly (approximately $7,000-$9,000 installed).
In comparison, a Merit series model such as the ML180V (single-stage, 80 percent AFUE) can be installed at less than 4,000 dollars in most instances. The mid-level Elite series, like the EL296V (96% AFUE, two-stage) are in the middle of the price range at about $4,500 to $6,000 installed. It should be mentioned that the real price may differ depending on the region and the installer, e.g. local labor rates, possible rebates, or challenging installation conditions (such as new ductwork or retrofit of a high-efficiency vent) may influence the final price. To get the best estimate of a particular Lennox furnace model, it is always best to get a detailed quote of the same by a licensed HVAC contractor.
How to Get the Best HVAC Prices
- Firstly, keep in mind that installation quality is always the most important thing for residential HVAC project. So never sacrifice contractor quality for a lower price.
- Secondly, remember to look up the latest rebates as we talked above.
- Thirdly, ask for at least 3 bids before you make the decision. You can click here to get 3 free estimates from your local contractors, and this estimate already takes rebates and tax credit into consideration and filter unqualified contractors automatically.
Lastly, once you chose the right contractor, remember to use the tactics from this guide: Homeowners Tactics When Negotiating with HVAC Dealer to get the final best price.
