Lennox SLP99V Price and Installation Cost

The Lennox SLP99V represents a high-efficiency, modulating gas furnace designed to deliver precise heating with minimal energy use. For homeowners, understanding the Lennox SLP99V price and installation cost is essential to budget accurately, compare quotes, and determine value over time. Costs vary by region, whether the unit is replacing an old system or installed in a new setup, ductwork needs, and any necessary gas line or venting upgrades. This guide provides current price ranges, explains what drives those costs, and offers practical tips to optimize value without sacrificing comfort.

What Is The Lennox SLP99V?

The Lennox SLP99V is a high-efficiency gas furnace engineered to deliver broad heating capacity with tight temperature control. It features a modulating gas valve and a variable-speed blower, which together help maintain steady temperatures while reducing energy waste. The unit is designed for quiet operation and reliable performance in a range of climates, including very cold environments. It typically integrates with Lennox smart thermostats and compatible zoning systems for precise, comfort-focused control. As a result, homeowners can expect strong performance, improved comfort, and potential energy savings compared with older, single-stage models.

Key capabilities include its 99% AFUE rating and advanced control options that optimize fuel use based on actual heating demand. The SLP99V is commonly used in mid-to large-sized homes and can be paired with existing ducts when properly sized. Installation quality, proper sizing, and correct duct sealing are essential to realizing the unit’s efficiency and comfort benefits.

Pricing Overview: SLP99V Price And Installation Cost

Prices for the Lennox SLP99V can vary significantly by region and installer. Homeowners typically see a combination of the furnace price and installation labor, plus any needed ductwork or gas-line upgrades. A reasonable expectation for overall cost is important for budgeting and comparison shopping. The numbers below reflect typical ranges seen in many U.S. markets, recognizing that actual quotes depend on market conditions, contractor policy, and project specifics.

Item	Typical Cost (USD)	Notes
SLP99V Furnace (furnace only)	$2,900–$4,300	Depends on configuration, features, and retailer.
Labor/Installation	$1,500–$3,500	Includes setup, wiring, and startup;
Ductwork/Sealing	$500–$3,000	Costs rise with extensive duct repairs or additions.
Gas Line Upgrade/Connection	$300–$1,000	Needed if existing lines are undersized or incompatible.
Vent/Flue Materials	$200–$700	Includes venting adjustments for high-efficiency models.
Thermostat/Controls	$120–$300	Smart thermostats add extra cost but improve control.
Permits	$50–$300	Local requirements may affect cost.
Disposal/Removal	$100–$300	Removing old equipment incurs a disposal fee.
Total Installed Range	$5,670–$13,400	Typical installations commonly fall in the broader range; regional pricing varies.

Overall, homeowners should anticipate an installed cost range broadly between roughly $5,700 and $13,400. In many markets, a representative total falls in the $7,000–$11,000 zone, especially when ductwork is in good condition and no major upgrades are required. Always obtain multiple formal quotes to capture regional pricing differences and contractor specifics that affect the final price.

What Affects The Final Price Of SLP99V Installation

• Replacement vs. new installation: Replacing an old furnace typically costs less than a full system replacement that requires new ductwork or zone controls.
• Ductwork integrity and sealing: Poor insulation or leaky ducts increase the amount of work needed and can impact efficiency.
• Gas supply upgrades: Larger or longer gas lines, or upgrading to a higher-capacity gas service, adds to the cost.
• Venting and flue requirements: High-efficiency furnaces often need specialized venting, which affects materials and labor.
• Thermostat and controls: Advanced controls (like smart thermostats or zoned systems) add equipment costs but improve performance and comfort.
• Labor rates by region: Local wages and contractor demand influence the overall installation cost.
• Permits and inspections: Some municipalities require permits and inspections, which adds time and cost.

Cost Drivers And Value: SLP99V Installation Details

Beyond the base price, the value of installing the SLP99V lies in improved comfort, lower energy waste, and potential rebates or incentives. The unit’s 99% AFUE rating means more heat from the same amount of fuel compared with older, lower-efficiency furnaces. In colder climates with longer heating seasons, the energy savings can be notable over several heating seasons, helping offset initial costs.

Another factor is compatibility with existing systems. If the home already has well-sealed ducts and a compatible thermostat, the job tends to be less complex and faster, reducing labor costs. Conversely, homes with aging ductwork, mismatched components, or poor insulation may require more extensive work, pushing the total price higher but delivering greater long-term payoff through efficiency gains.

Itemized Cost Breakdown: Typical Installed Cost Components

The following table provides a practical breakdown of costs homeowners may encounter when installing the SLP99V. Real-world numbers depend on location, contractor, and project specifics.

Component	Typical Cost	Impact on Total
Furnace	$2,900–$4,300	Core equipment price.
Labor	$1,500–$3,500	Installation labor, startup, and commissioning.
Ductwork & Sealing	$500–$3,000	Sealing, repair, or new duct runs.
Gas Line Upgrade	$300–$1,000	Gas supply readiness for high efficiency unit.
Vent/Flue	$200–$700	Venting modifications for efficiency.
Thermostat/Controls	$120–$300	Smart control options may add cost.
Permits	$50–$300	Regulatory requirements depending on locality.
Disposal	$100–$300	Removal and disposal of old furnace.
Subtotal	$5,670–$13,400	Sum of above components.

Note: The totals assume a standard replacement with average duct integrity. Complex installations or upgrades can exceed the upper range, while simple replacements in well-maintained homes may fall toward the lower end.

Installation Process And Timeline

HVAC professionals follow a structured process to install the SLP99V efficiently and safely. Initial assessment includes system sizing using industry-standard methods to match furnace capacity with home heat load. A permit check may be required by local authorities. On installation day, technicians disconnect and remove the old unit, inspect and clean the area, run new or inspected gas lines, and ensure proper venting. The furnace is set, wired to a compatible thermostat, and tested for performance, airflow, and safety. Homeowners usually receive a walkthrough of controls and maintenance steps before commissioning.

Most installations take one to two days in typical homes with existing ducts in good condition. More complex jobs—such as replacing a very old furnace, upgrading ductwork, or adding zoning—can extend the timeline to two to four days. Regional scheduling and permit processing can also affect the total duration.

Warranty, Rebates, And Financing

Warranty terms for the SLP99V vary by model configuration and installer. Lennox typically provides a substantial warranty on parts and the heat exchanger when registered and installed by an authorized dealer. Homeowners should verify the exact terms with the installer, including any required maintenance plan to keep the warranty active. In addition to manufacturer coverage, many utilities and local governments offer rebates or incentives for high-efficiency heating equipment. Financing options may also be available through the installer or lenders, helping to manage the upfront cost.

Because incentives change by region and program, it is prudent to ask the contractor for current rebate details, eligibility requirements, and how the SLP99V aligns with local energy programs. Documentation and proper registration often simplify rebate processing and ensure coverage for the full warranty period.

Tips To Get The Best Value For The SLP99V

• Obtain multiple formal quotes from qualified, NATE-certified HVAC technicians to compare pricing and included services.
• Ensure proper sizing using Manual J calculations to avoid under- or over-sizing, which affects comfort and energy use.
• Insist on duct sealing and testing as part of the installation to maximize efficiency.
• Ask about thermostat options, zoning compatibility, and smart controls that optimize daily use.
• Inquire about available rebates, tax incentives, and financing plans to reduce upfront cost.
• Request a detailed written warranty summary and a maintenance plan to protect long-term reliability.
• Review the full cost breakdown before signing, so there are no surprises post-installation.