This guide will compare five of the most popular Lennox models: ML18XC2, EL18XCV, ML17XC1, ML14XC1, and 13ACX to help U.S. homeowners understand the differences between them.We will compare the SEER (Seasonal Energy Efficiency Ratio) ratings, performance (single-stage, two-stage, variable speed), average prices, and advantages and disadvantages of each unit.
| Model | Efficiency (up to SEER) | Cooling Stages | Installed Price Range |
|---|---|---|---|
| Lennox ML18XC2 (Merit) | 18 SEER | Two-stage | $5,600 – $9,600 |
| Lennox EL18XCV (Elite) | 18 SEER | Variable-speed | $5,300 – $9,400 |
| Lennox ML17XC1 (Merit) | 17 SEER | Single-stage | $4,500 – $8,400 |
| Lennox ML14XC1 (Merit) | 16 SEER | Single-stage | $4,300 – $7,900 |
| Lennox 13ACX (Merit) | 13 SEER | Single-stage | $3,700 – $7,900 |
How do the Lennox ML18XC2, EL18XCV, ML17XC1, ML14XC1, and 13ACX differ in efficiency and performance?
One of the main distinctions between these models is energy efficiency and type of compressor. The EL18XCV (Elite series) and ML18XC2 (Merit series) have the best efficiency, each rated up to ~18.0 SEER.
The EL18XCV has a variable-speed inverter compressor that continuously modulates, whereas the ML18XC2 has a two-stage compressor with high/low settings.
The ML17XC1 and ML14XC1 are single-stage mid-efficiency units (approximately 16-17 SEER). Lastly, the 13ACX has the lowest rating at 13 SEER, which is the minimum allowed for units sold in the U.S.
Practically, single-stage units (13ACX, ML14, ML17) operate at full capacity when switched on, which may lead to greater temperature fluctuations and less humidity removal.
Conversely, two-stage (ML18) and variable-speed (EL18XCV) models operate at reduced output most of the time to achieve more consistent temperatures and improved humidity control with reduced energy consumption.
You can use our SEER calculator to calcualte the savings
How much does each Lennox AC model cost to install on average?
The price of these Lennox air conditioners depends on the model and size. The average cost of low-end models is about $3,700, and high-end models are about $9,000 and above.The ranges of average installed prices of each model are as follows:
- Lennox 13ACX: $3,700 – $7,900 installed
- Lennox ML14XC1: $4,300 – $7,900 installed
- Lennox ML17XC1: $4,500 – $8,400 installed
- Lennox ML18XC2: $5,600 – $9,600 installed
- Lennox EL18XCV: $5,300 – $9,400 installed
These price ranges indicate smaller (1.5-2 ton) units at the lower end to larger (4-5 ton) units at the higher end. The Merit series models (13ACX, ML14, ML17, ML18) tend to be more affordable, with average prices under $7,500 installed.
The Elite series EL18XCV is generally more expensive, especially at the higher end of the scale (nearing $9,000 or above for larger systems). Actual prices vary depending on unit tonnage, installation requirements, and local labor rates.
Don’t Overpay for HVAC Services – Call 888-894-0154 Now to Compare Local Quotes!
What are the pros and cons of the Lennox ML18XC2 air conditioner?
Lennox Merit Series ML18XC2 two-stage air conditioner unit.
The Lennox ML18XC2 is the high-end Merit series AC from Lennox, featuring two-stage cooling and up to 18.00 SEER efficiency. It provides consistent comfort by operating mostly on its lower stage, maintaining even temperatures rather than cycling on and off continuously.
As a Merit model, it offers strong performance at a lower price but lacks some smart features found in more expensive models. The unit is ENERGY STAR qualified due to its high efficiency and is available nationwide, meeting efficiency standards in every region.
Pros:
- High efficiency (up to 18 SEER), helping save on energy bills.
- Two-stage compressor mainly operates at a slower pace, providing more uniform cooling and better humidity control in milder weather.
- Offers high-end comfort at a mid-range price, representing good value for a two-stage unit.
- ENERGY STAR certified, which can qualify for utility rebates and ensures high efficiency.
Cons:
- Higher upfront cost compared to single-stage models like the ML14XC1, due to two-stage technology.
- Less precise temperature control than variable-speed units, since it has only two fixed cooling levels.
- Somewhat noisier at full capacity (~75 dB) compared to top-tier models, which can operate in the mid-60 dB range at low speed.
- Lacks advanced smart capabilities (no built-in diagnostics or Wi-Fi without an add-on thermostat) available in some Elite/Signature series units.
What are the pros and cons of the Lennox EL18XCV air conditioner?
Lennox Elite Series EL18XCV variable-speed air conditioner. This Elite line model features a variable-speed (inverter-driven) compressor that constantly adjusts cooling capacity, delivering up to 18.0 SEER efficiency and precise temperature control.
The EL18XCV employs the company-owned Quantum Coil to resist corrosion and is ENERGY STAR certified for high efficiency. Digital-ready and smart thermostat compatible, it provides advanced self-monitoring and climate control features. While it costs more than Merit series units, its superior comfort and efficiency can lower operating expenses over time.
Pros:
- Variable-speed inverter compressor offers precise temperature control and excellent humidity removal by adjusting output as needed.
- High energy savings due to top efficiency (18.0 SEER, 18.8 SEER2) compared to lower-SEER units.
- Operates at low speeds longer instead of frequent on/off cycles, resulting in even comfort and improved efficiency.
- Performance monitored by advanced digital-ready technology, integrating with smart thermostats for optimal comfort and energy use.
- ENERGY STAR certified with durable Quantum Coil construction for long-term reliability.
Cons:
- Highest price among these models due to advanced variable-speed technology.
- Requires more frequent servicing to maintain optimal performance due to system complexity.
- Repairs may be costlier because proprietary or advanced parts can be expensive and take longer to replace.
- May need a compatible smart thermostat (e.g., Lennox iComfort) to access all advanced features, raising total system cost.
What are the pros and cons of the Lennox ML17XC1 air conditioner?
The Lennox ML17XC1 is a single-stage scroll compressor Merit series air conditioner offering a maximum efficiency of around 17.0 SEER. It uses Lennox’s aluminum Quantum Coil for durability and effective heat transfer, and is ENERGY STAR qualified for solid efficiency
More efficient than the base ML14 model yet less expensive than multi-stage units, the ML17XC1 is available nationwide. When paired with a variable-speed furnace or air handler, it can run longer cycles at reduced airflow to enhance humidity control and indoor comfort.
Pros:
- High efficiency for a single-stage unit (up to 17 SEER, ~13.8 SEER2), lowering operating costs compared to older 13-14 SEER systems.
- ENERGY STAR rated, meaning higher efficiency than federal standards and potential energy savings.
- Features Lennox Quantum Coil for corrosion resistance and improved coil lifespan.
- Available nationwide without regional efficiency restrictions.
- Mid-range price—typically less expensive than two-stage or variable-speed units, offering good value.
Cons:
- Single-stage compressor only operates at full capacity or off, potentially causing slight indoor temperature swings and reduced part-load efficiency compared to two-stage systems.
- Lacks added comfort features of advanced models, such as lower stages for ultra-steady temperatures and variable capacity, so it performs less well than two-stage and variable-speed units in comfort and efficiency.
What are the pros and cons of the Lennox ML14XC1 air conditioner?
The Lennox ML14XC1 is a lower-end Merit series AC providing standard single-stage cooling. Though its name suggests it is limited to 13 SEER efficiency, in reality it can reach 16-17 SEER, a notable improvement over older 13 SEER models.This model includes the Lennox Quantum Coil (unlike the 13ACX), boosting efficiency and corrosion resistance. It is often ENERGY STAR certified in certain sizes and regions, meeting or exceeding program requirements. ML14XC1 is Lennox’s most affordable central AC, suitable for homeowners on a budget. While availability has occasionally been region-specific due to efficiency regulations, current models comply with federal efficiency standards in most areas.
Pros:
- Low initial price: one of the lowest prices for a new Lennox central AC.
- Good efficiency for its cost: mid-teen SEER ratings reduce consumption compared to 10-13 SEER older units.
- ENERGY STAR rated: many configurations exceed minimum efficiency and may qualify for rebates.
- Quantum Coil technology: same corrosion-resistant coil as higher-end models, improving longevity.
- Simple single-stage design: fewer complex parts, potentially reducing failure points during its lifespan.
Cons:
- Single-stage cooling only, cycling fully on or off, which may cause less uniform indoor temperatures and lower efficiency than multi-stage systems.
- Lower efficiency than higher-end models, consuming more electricity than 18+ SEER units.
- No advanced features like variable fan speeds or smart connectivity; it is a basic cooling unit without premium options found in costlier series.
- May not be ideal for very hot or humid climates where higher SEER or two-stage systems provide better humidity control and comfort.
What are the pros and cons of the Lennox 13ACX air conditioner?
The Lennox 13ACX is the simplest model in the Lennox lineup. It features a single-stage compressor and has an approximate efficiency of 13.0 SEER (12.4 SEER2), representing the federally mandated minimum for units sold in the U.S.This unit does not carry an ENERGY STAR rating due to its efficiency. It is an older Merit series model, once popular for its low price. Its availability has decreased recently because efficiency regulations have increased minimum ratings. However, it remains a viable option for homeowners with tight budgets or those replacing older 13 SEER units.
Pros:
- Cheapest initial cost: the most affordable Lennox option for budget-conscious buyers.
- Simple and reliable cooling: good for smaller homes or mild climates without the complexity of advanced systems.
- Basic proven design: fewer complex electronics mean easier repairs and less costly parts.
- Cools equivalently to higher-SEER models: similar BTU capacity to the same-sized units, but uses more energy.
Cons:
- Lowest efficiency in the list at 13 SEER, resulting in higher energy consumption and operating costs compared to 16-18 SEER units.
- Not ENERGY STAR qualified, so lacks eligibility for most rebates and offers minimal energy savings.
- Does not include Lennox’s newer Quantum Coil, so has lower coil corrosion resistance and durability.
- Supply is decreasing as some regions ban sale of 13 SEER units due to new 14 SEER or higher requirements. Homeowners may need to consider ML14 or higher models.
- Noisier and less smooth operation; produces about 76 dB and cycles on/off more frequently than two-stage or variable-speed units.
Don’t Overpay for HVAC Services – Call 888-894-0154 Now to Compare Local Quotes!
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.
