How Much Does a Lennox 5-Ton AC System Cost in 2025? Savvy Mavi’s Ultimate Guide

🏠 Understanding Lennox AC Costs

If you’re asking yourself, “how much is a Lennox air conditioner?” or “what’s the cost of Lennox furnace and AC replacement?,” you’re not alone. Lennox is a premium brand known for efficiency, reliability, and advanced features, but with that comes a price range that varies widely depending on size, model, and installation.

Here’s what impacts the cost of a Lennox AC system:

1. System Size: A 3-ton unit is ideal for homes up to 2,000 sq. ft., a 4-ton unit for 2,000–2,500 sq. ft., and a 5-ton unit for homes exceeding 3,000 sq. ft. Oversizing can cause short-cycling, while undersizing leads to uneven cooling.

2. Efficiency Ratings (SEER): SEER determines energy efficiency. Higher SEER units cost more upfront but can reduce electricity bills by up to 40%.

3. Installation Complexity: Homes with existing ductwork have simpler installation, while older homes may require duct modifications or electrical upgrades.

4. Model & Features: Lennox models like ML17XC1, EL17XC1, XC20, and XC21 differ in price, efficiency, and technology.

For homeowners looking for a more budget-friendly option without compromising performance, the Goodman 3 Ton 14.5 SEER2 R-32 bundle offers a solid alternative. (source)

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💰 Lennox AC Costs by Tonnage

3-Ton Lennox AC

• ML17XC1 price: $3,800–$4,500 installed

• EL17XC1 price: $4,200–$5,000 installed

• Suitable for homes up to 2,000 sq. ft.

• Provides efficient cooling for standard residential needs

4-Ton Lennox AC

• 4 Ton 16 SEER price: $5,500–$6,500 installed

• Best for homes 2,000–2,500 sq. ft.

• Balanced airflow without oversizing

• Popular among mid-size homes

5-Ton Lennox AC 3-Phase

• XC20/XC21 price: $6,500–$9,500 installed

• Ideal for large homes or small commercial spaces

• Requires 3-phase power for optimal performance

• Offers maximum efficiency and long-term energy savings

(Lennox.com)

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🔧 Installation Costs

Installation accounts for a significant portion of the total price. Here’s what homeowners need to consider:

• Existing Ductwork: Well-maintained ducts reduce installation time and cost, while adding ducts can add $2,000–$5,000.

• Electrical Upgrades: 5-ton, 3-phase Lennox units may require electrical upgrades ($500–$2,000).

• Labor Complexity: Multi-story homes, tight attic spaces, or unusual layouts can increase labor costs.

• Permit Fees: Depending on your city or county, permits may cost $100–$500.

Installation typically adds $1,000–$3,500 to the system cost. (homeadvisor.com)

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🏡 Full HVAC Replacement: Furnace + AC

Many homeowners choose to replace both furnace and AC simultaneously. Benefits include:

• Lower overall energy costs

• Improved system compatibility

• Reduced maintenance headaches

Lennox furnace and AC combo cost: $7,500–$12,000 installed
High-efficiency or large system replacement: Up to $15,000
Installation costs: $3,000–$5,000 depending on complexity 

Replacing aging systems also allows for energy-saving upgrades like programmable thermostats, variable-speed compressors, and zoning controls.

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🔹 Choosing the Right Lennox System

Questions to Ask:

• What is my home’s square footage?

• Do I need 3-ton, 4-ton, or 5-ton capacity?

• Am I replacing both furnace and AC?

• What SEER rating fits my budget and energy goals?

Choosing the right system ensures efficient cooling, lower energy bills, and a comfortable home. Oversized or undersized systems can lead to premature wear, high utility bills, and uneven cooling.

Popular Lennox Models and Pricing

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⚡ Energy Efficiency and Long-Term Savings

Energy-efficient systems save money in the long run. Benefits of high-efficiency Lennox units include:

• SEER 16–21: Reduces energy bills by 20–40%

• Variable-Speed Compressors: Maintain consistent temperature and humidity

• Smart Thermostats: Program schedules for energy savings

Homeowners seeking a cost-effective alternative can also consider the Goodman 3 Ton 14.5 SEER2 R-32 bundle, which balances efficiency and price. (energy.gov)

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🔧 Maintenance and Longevity

Even high-quality systems require care:

• Annual Tune-Ups: $75–$150

• Filter Replacement: Every 1–3 months

• Repairs: Early maintenance reduces the likelihood of major breakdowns

Proper maintenance extends system life to 15–20 years and ensures energy efficiency.

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💡 Tips to Save Money on Lennox AC

1. Bundle furnace and AC replacement for better pricing

2. Take advantage of federal, state, and local rebates

3. Upgrade home insulation to reduce energy load

4. Use programmable or smart thermostats

5. Hire licensed installers to ensure warranty compliance (angieslist.com)

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🔹 Where to Buy Lennox Units

• Licensed HVAC Dealers: Ensure installation and warranty coverage

• Home Improvement Stores: Sometimes cheaper upfront, may not include installation

• Online Distributors: Can save on equipment cost but verify licensed installers

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🏠 Final Thoughts

So, “how much does a Lennox AC cost?” depends on several factors:

• Unit size and SEER rating

• Installation complexity

• Existing ductwork and electrical system

• Additional features like smart thermostats or zoning

While upfront costs may seem high, investing in a reliable, energy-efficient system pays off with reduced utility bills, fewer repairs, and long-term comfort.

For homeowners seeking a value-driven option, the Goodman 3 Ton 14.5 SEER2 R-32 bundle provides excellent performance without breaking the bank. (source)