Heat pumps are growing in popularity because they are affordable, efficient, and easy to install. While the major brands continue to push out new, more impressive models, you have a decision to make.
Lennox is a premium brand name that makes a wide range of heat pumps. This article is designed to show you what a heat pump is, how they work, and review the Lennox brand. We will review each of the Lennox heat pump models to help you find the right one for your needs.
Overview Of Lennox Heat Pumps
Lennox is a premium manufacturer of home climate control items. Their specialties in HVAC are well known the world over. With the introduction of the first riveted furnace in 1895, Lennox has spearheaded innovation and technological advances in many categories.
Now, based in Richardson, Texas, Lennox supplies products through their 6000+ dealers. Of those products are their 12 models of heat pumps. Each model comes with its own pros and cons, and there are many more pros than cons.
While Lennox may not be the first name in your head, they should be when it comes to heat pumps. With the Signature series, you get heat pumps with high-efficiency ratings and near-perfect customer reviews.
They also offer the Elite series for a bit of money savings without losing much in the way of installation or efficiency. Finally, you can save even more with the Merit series, a lower-cost solution for tighter budgets.
Regardless of your needs, whether new install, upgrade or replacement, Lennox has a heat pump solution that will save you money and last a virtual lifetime.
Heat Pump SEER Ratings & Tonnage Explained
Heat pumps are measured in tonnage to help explain their capacities and output. Tonnage does not refer to the weight of the unit. Instead, a ton is equal to 12,0000 BTUs. When shopping for your heat pump, you will need to know the square footage of your space.
This square footage equates directly to the size (in tons) of heat pump that you need. A 1 ton (12,000 BTU) system, for example, can efficiently heat or cool a 600 – 900 square foot space. Most heat pumps range between 1 and 5 tons (60,000 BTUs).
Another thing to take note of is the efficiency ratings. For cooling mode, the efficiency is measured by the Seasonal Energy Efficiency Ratio (SEER). This is the ratio of energy intake (in watts) versus cooling output (in BTUs). A higher SEER rating means a more efficient system.
For heat pumps, a 16 to 18 SEER rating is considered great. Anything over 19 SEER is exceptional. However, do not confuse SEER with the HSPF rating. This is the Heating Seasonal Performance Factor.
HSPF also rates the watts versus BTU output but when the system is in heating mode. The HSPF is going to be much lower than SEER. However, a good to great rating is an 8 to 9 HSPF. HSPF 10 or higher is considered excellent.
Lennox Heat Pump Range (Side By Side Comparison)
In this section we will rate and review the Lennox heat pumps. All 12 models are listed here so you can see their energy efficiency ratings, sizes available, and types of compressors used. We also cover average costs for the units and installation costs (based on 3 ton models for each category).
Below the chart, we review the models and series of heat pumps offered by Lennox. Each mini-review will cover the important aspects you need to know to make an informed decision.
| Heat Pump Model | SEER | Ton | Home Size | Compressor Type | HSPF | Cost (Unit Only) | Cost + Install |
|---|---|---|---|---|---|---|---|
| Lennox XP25 | 23.5 | 1.5 – 5 | 1200 – 3200 sq. ft. | Variable Speed | 10.2 | $5600 | $14000 |
| Lennox XP21 | 19.2 | 1.5 – 5 | 1200 – 3200 sq. ft. | Multi-Stage | 9.7 | $4800 | $11400 |
| Lennox SL18XP1 | 18.5 | 1.5 – 5 | 1200 – 3200 sq. ft. | Single-Stage | 10.2 | $3700 | $9600 |
| Lennox XP20 | 20 | 1.5 – 5 | 1200 – 3200 sq. ft. | Variable Speed | 10 | $4500 | $9900 |
| Lennox XP16 | 17 | 1.5 – 5 | 1200 – 3200 sq. ft. | Multi-Stage | 9.5 | $3100 | $8800 |
| Lennox EL16XP1 | 17 | 1.5 – 5 | 1200 – 3200 sq. ft. | Single-Stage | 9.8 | $3200 | $8900 |
| Lennox EL15XP1 | 16 | 1.5 – 5 | 1200 – 3200 sq. ft. | Single-Stage | 9 | $3200 | $8900 |
| Lennox XP14 | 16 | 1.5 – 5 | 1200 – 3200 sq. ft. | Single-Stage | 9.5 | $2800 | $7300 |
| Lennox 16HPX | 17 | 1 – 5 | 900 – 3200 sq. ft. | Multi-Stage | 9.5 | $3100 | $8800 |
| Lennox ML16XP1 | 17 | 1 – 5 | 900 – 3200 sq. ft. | Single-Stage | 9.8 | $2900 | $7300 |
| Lennox ML14XP1 | 16 | 1 – 5 | 900 – 3200 sq. ft. | Single-Stage | 9 | $2600 | $6800 |
| Lennox 14HPX | 16 | 1 – 5 | 900 – 3200 sq. ft. | Single-Stage | 8.2 | $2200 | $6200 |
Lennox Heat Pump Reviews
Lennox splits their heat pump models into three distinct groups. The Signature Series, named after founder Dave Lennox, houses the premium line of high-quality heat pumps. The Elite series is the next step down, balancing pricing and performance to reach more budgets and homes across the country.
Finally, they offer the Merit series, a group of powerful heat pumps made for smaller budgets that still want performance and efficiency. No matter which line you go with, you are getting a Lennox name that stands for reliability, dependability, and performance.
Dave Lennox Signature Collection
The Dave Lennox Signature Series has all the bells and whistles you would expect from the top line. The best model, XP25, also has the highest price tag. With that cost, though, you get a variable speed compressor that combines with Precise Comfort technology. This allows the system to run within 1% of the required energy needed to maintain the set temperature.
The XP25 is one of the most efficient systems on the market, with a possible 23.5 SEER and 10.2 HSPF. Not to be outdone, though the XP21 is also quite efficient and makes great use of a multi-stage compressor. While it isn’t a variable speed, it does shift between 5 or more operating ranges to give you a much more precise temperature range without fluctuation.
Finally, the SL18XP1 rounds out the signature series with a single-stage compressor. It is almost unheard of for a single-stage compressor to reach much over 17 SEER. However, this model has the potential to reach up to 18.5 SEER and 10.2 HSPF.
With all signature series models you get near-silent operation with sub-50 decibel ratings and a 10-year standard warranty on all parts.
Elite Series
There are 5 models in the Elite series, and each one is at least rated at 16 SEER. There is the series XP20, which is just short of qualifying for the Signature series. It has a 20 SEER, 10 HSPF rating, and a variable speed compressor. While it doesn’t use Precise Comfort technology, it will maintain temperature much easier than other compressor styles.
The other models in the series use either a single-stage compressor or the same multi-stage compressor of the SL18XP unit. These models also feature quiet operation with the highest noises coming from the XP16 at 62dBA when running on high.
What you get most from the Elite series is a performance and rating factor that matches most other brand’s top lines and a price that mimics the industry average for mid-range units. It is a difficult trade-off to maintain, but the elite series does it well.
The noticeable difference is in the warranty, which offers the Elite series a 5-year coverage on the parts and 10-years on the compressor.
Merit Series
The Merit series isn’t anything to overlook. Just because they are considered entry-level heat pumps doesn’t mean they don’t have a lot of benefits. The most obvious of which, of course, is the price. Lennox’s lowest-priced heat pumps cover four models.
The 16HPX is the only entry-level model to feature a multi-stage compressor. This gives the unit a 17 SEER and 9.5 HSPF rating making it easily the most efficient low-end unit on the market.
The other three models all use a single-stage compressor and have some of the louder operational noise levels of all Lennox heat pumps. Still, with only reaching near 70dBA, they aren’t the loudest on the market, by far.
If you need to save money on your heat pump and its install, the Merit series is your answer. Just note that all four models come with only 5-year warranties on parts and compressors—even the highly-rated 16HPX.
Things To Think Of When Buying A Lennox Heat Pump
When you have decided on buying a heat pump, you still have a lot of things to think about. Finding the ideal model is more than just a quick internet search. One of the first things you need to consider is the type of heat pump you need.
Standard ducted heat pumps are ideal for replacing an existing central Ac system. They can replace all the parts, use your ducts and vents without needing adjustments, and in many cases, will mount directly where the AC components are.
Mini-split systems are easier to install but have different requirements for mounting and running refrigerant lines. Once you decide on a type, you need to decide on a heat pump brand. Different brands offer different features, options, and aspects that you may need.
Some brands like Bosch have wireless communications that enable a quicker install and setup. Others may offer a compact size for easier mounting.
Noise And Efficiency
You also want to find a model that has a higher efficiency than what you have now. High efficiency models are easily found in all types of heat pumps, but a minimum SEER value of 16 is ideal for most parts of the country. Higher SEER values can allow you to save a lot of money in the long run.
You should also think about noise levels. Some models and brands do nothing (or very little) to minimize noise production. Cheaper models and low-end units can end up producing a lot of noise, which may be disruptive to you or your neighbors. A good noise level is a model that produces, on high speed, anything less than 65dBA. Most mid-range and high-end heat pumps will range between 25 and 55dB.
Unit Costs And Warranty
Finally, you will want to consider the cost. The unit cost itself can range between $1,000 and well over $10,000. Depending on the brand, model, and features, you may end up paying for things you don’t need.
If you are having your heat pump professionally installed (highly recommended), those costs can rise quickly. You need to make sure you get enough quotes from highly trained contractors before you decide. The average installation price, according to Networx, will vary between $3,875 and $10,000.
Don’t forget about the warranty, though. Many brands will offer a lower warranty asking you to register for a longer coverage term. Most registration needs to be done in a specific amount of time (about 60 days). The extra coverage is worth it.
Lennox, for example, offers a flat coverage of 5 to 10 years without registration, but this can be extended up to 20 years if you register (depending on model and type).
Tax Credits Explained
The tax credit program is an incentive for buying and installing high efficient systems. Heat pumps get a flat rate of $300 tax credit as long as they meet certain requirements.
Part of the program is to promote high efficiency devices in our homes to reduce reliance on natural resources. However, it is also aimed to promote professional installation to ensure correct setup. Most issues with efficiency are found due to improper installation.
With this program, your new heat pump system can earn you $300 on your income tax. To qualify:
- You must be the homeowner and live in the home where the heat pump is installed.
- The heat pump must be a minimum 15 SEER and 8.5 HSPF (split systems) or 14 SEER and 8 HSPF (packaged systems).
- Unit must be professionally installed.
- Heat pump must be purchased and installed prior to December 31, 2021.
If you meet all these requirements, congratulations. All you need to do now is file tax form 5695 with your federal income tax, and the credit will be applied.
Calculating A Heat Pumps Power Consumption
If you want to know how much your system will cost before you buy, you can run a calculation to figure out a good guess. The simple formula takes four variables and returns the amount of money you will pay to run the heat pump.
That formula requires the following four variables:
- Kilowatts of the system Locate the wattage and divide by 1000 to get the kilowatts (kW).
- Cost per kilowatt-hour (kWH), found on your monthly energy bill.
- Average hours per day the system runs over the period you are calculating (average is 4 to 6 hours per day).
- Number of days in the coverage period.
Once you know those, you simply multiply the numbers together: kW x $/kWh x hours x days.
For example, if we take a system that runs on 4200 watts (4.2 kW) and we pay 13 cents per kWh, we can see how much this system will cost running 5 hours per day for 90 days: 4.2 x $0.13 x 5 x 90 = $245.70.
Lennox Heat Pumps Vs. Other Brands
Lennox is a major name brand in the HVAC community. How do they stand up against other big-name brands, though? This section will compare Lennox heat pumps against American Standard, Trane, Bryant, Carrier, and Daikin.
Lennox Vs. American Standard
American Standard heat pumps offer an affordable solution to an otherwise high cost industry. While most units are affordable for certain budgets, American Standard attempts to cater to mid and entry-level models that are more affordable than most other brands.
However, when it comes to selection, Lennox doubles up on American Standard, which only offers 6 options. Those half dozen choices, though, are quiet, efficient, and durable. With an average SEER rating of 16.5, American Standard doesn’t stand out as having highly efficient products.
Compared to Lennox who offers a range-wide average of 17.25 SEER, it seems that cost may be the only thing American Standard has over Lennox.
Not true, though, as American Standard is readily available, parts are cheaper, and if the system does run into problems, their onboard diagnostics are top-notch. Saving you time, money, installation fees, and maintenance, American Standard is a solid option for those looking to purchase their first heat pump system.
Lennox vs. Trane
Lennox and Trane heat pumps constantly go head to head as top rivals. Mainly because they appeal to the same group of consumers, they offer high-quality systems with plenty of options, quiet operation, variable speed compressors, and more. Other than the system’s style and how the heat pumps look sitting next to your house, it is hard to tell them apart.
Both brands offer a large selection of models. They also have systems aimed at most budget ranges, and even their warranties are similar. Where Lennox stands out is in their durability and quality build of their systems. Each range from the Signature series through the Merit series is designed to hold up to any weather, at any time, for at least a decade.
Where Trane prevails is in its efficiency, customer service, and installation costs. While not the cheapest units available, Trane does have some of the lowest install costs compared to similar models of size and power.
Lennox Vs. Bryant
Where Bryant is concerned, you have to truly look at each individual model. Comparing series’s and performance will result in a near-equal status from both companies.
Lennox does have a slightly higher unit cost but makes up for it in a marginally higher SEER and HSPF average. When you compare the entire lineup, Lennox makes a little more sense as they offer a better overall product.
However, Bryant can compete toe to toe with each model from Lennox. Their warranties are excellent, installation is a breeze, and they last just as long, performing just as well as Lennox. To decide between these two brands, you must decide on a specific model from each and go with the one that looks best to you.
Lennox Vs. Carrier
Carrier is arguably the most well-known and biggest HVAC company in the world. Comparing anyone else to them is difficult. Carrier offers state-of-the-art heat pumps with incredible durability and cost-effective components.
Likewise, Lennox has higher efficiency ratings across the board, and their systems look more polished and professional. Lennox also offers a higher base warranty for most of their heat pumps, where Carrier relies on registration to add to the warranty.
Either way you go here will depend on your need for an aesthetically pleasing unit (Lennox) or a highly durable and resilient system that is easy to maintain and low cost to repair (Carrier).
Lennox Vs. Daikin
Daikin heat pumps have a lot to offer. As the biggest company and part-owner of the Goodman Global Group, you will have a reliable, durable, and highly efficient heat pump, no matter which model you go with.
The craftsmanship leans towards Lennox. Known for their professional approach and high-quality standards, Lennox heat pumps are hard to beat. Where Daikin wins is in the cost and on the warranty for some models.
With a 12 year total warranty, not many models or brands come close (most offer 5 to 10 years). However, Lennox does have a few models that will beat this warranty, though they do cost a lot more.
Daikin has higher installation costs, and parts aren’t as readily available. However, neither unit is known to break down without a major cause, so you shouldn’t have much to worry about if you want to save some cash and shop Daikin instead of Lennox.
Hiring An HVAC Professional to Install a Heat Pump
If there is any doubt that you should hire a professional, trained HVAC technician for your heat pump install, let that go now. The only downside to hiring a professional is the labor cost. However, the benefits you get far outweigh those costs.
System Warranty Will Be Guaranteed
Many brands require a professional installation to maintain the warranty. While this isn’t universal, it is common. You will also find in the warranty paperwork that annual inspections, repairs, and maintenance must also be conducted by a licensed professional.
To ensure that you receive the warranty, it is upheld and continues for the full term, a professional install is recommended. On top of that, most heat pump warranties will not cover labor. However, when you have your system professionally installed, the contractor will generally add a labor warranty to the deal, further minimizing out-of-pocket costs if something goes wrong.
Ensure Safety Of All
Safety is paramount, and your personal safety is best covered when someone trained in heat pump installation and repair is performing the actions. The safety concerns don’t end there, either. The safety of your home and equipment are also covered.
With an HVAC technician performing your install, your heat pump and components are better protected, as well as the structural integrity of your home. All of these pose a threat to an unskilled installer, and one wrong step can have lasting effects.
Correct Products Will Be Supplied
With a contractor performing the install, they will also be responsible for ordering and delivering your heat pump system. This added step prevents you from having to order and pay for shipping and waiting for a spot in the schedule to open up.
You also get the benefit that the right system for your home will be used. The contractor will do an inspection, measuring your home and checking for existing issues. This inspection will also tell them exactly what sized and capacity heat pump you require. Getting the right size will only improve the efficiency and lower costs in the long run.
Increase Efficiency Due To A Correct Setup
Proper installation will also ensure that the system performs at its best. From day one until it is time to replace the system again decades down the line, running at top performance capabilities is crucial.
Licensed HVAC technicians can install, test, and adjust the system to make sure it runs correctly, most efficiently, and without any issues right from the start.
Troubleshooting Tips & FAQs for Lennox Heat Pumps
In this section, we will investigate common issues and their fixes with Lennox heat pumps. We will also answer some of the more commonly asked questions.
Lennox Heat Pump Trips Breaker Or Freezes Up
If your heat pump continuously trips a breaker, there is most likely a power drain problem. The most common reason is diminished airflow. This makes the system have to work harder, pull more electricity, and pop a breaker. Check the air filter and coils for dirt, clogs, or damage and clean or replace as necessary.
If the unit is freezing up, the most likely culprit is low refrigerant. Unfortunately, this is almost always due to a leak. You will need to call a professional to diagnose and find the leak and then repair it while refilling the refrigerant to proper levels.
Lennox Heat Pump Not Heating Or Cooling Correctly
If the heat pump is not heating or cooling as it should, there are several things you need to check. First, check the thermostat. Make sure the system is on and in the right mode. Frequently, professionals are called in to charge $60 per hour only to flip a switch on the thermostat.
Next, check airflow. Inspect the air filter for dirt or clogs. Double-check room vents and ensure they aren’t closed or clogged with debris. After that, you want to inspect the coils and blower motor (see below). Look for icing or a stuck fan blade.
If everything appears to be working fine or isn’t iced over, you will need to call an HVAC tech for a proper diagnosis.
Lennox Heat Pump Blower Doesn’t Run
If the blower isn’t moving, the fan motor is most likely burnt and needs to be replaced. However, before you start tearing apart the system, you need to check a couple of things. You can check all the wiring, breakers, and, of course, the thermostat.
When you inspect the wiring, note that you will be dealing with circuits that are 220 – 240 volts. Take extra caution. If you are unsure or don’t have the proper tools, call a professional for diagnosis and repair.
How Do I Reset My Lennox Heat Pump?
Lennox heat pumps do not have a reset button. There is (on some models) a pump on/off switch on the control panel. If your model has this, check it first. Otherwise, you will need to perform a power cycle reset.
Turn the system off at the thermostat. Then find the breaker that controls the heat pump and turn it off. Let the system stay off for 5 minutes and then turn the breaker back on. Turn the system on at the thermostat. Note that some cases will need to be power cycled twice before they work properly.
If the heat pump still doesn’t come on after a second power cycle, you will need to call a professional for diagnosis and repair.
Why Is My Heat Pump Not Turning On?
If the system isn’t turning on at all, there is most likely a broken part. You can check the normal places first (thermostat set to on, breakers aren’t tripped, etc.). Because the system is interconnected, if one part breaks, the system will shut off to prevent further damage.
Because of this, you will need to call an HVAC tech to come and diagnose the entire system to find the broken part. Once it is identified, you can discuss repair or replacement options or determine if the part is under warranty.
Are Lennox Heat Pumps Quiet?
Lennox heat pumps are quiet. They have a few models that are considered the quietest models in the industry (though it is debatable), such as the XP series. The industry average for noise production is between 60 and 75dBA. Lennox heat pumps (averaging all models) fall between 48 and 62dBA, which is much quieter than industry expectations.
Lennox Heat Pump Error Codes
Lennox heat pumps are equipped with self-diagnostic codes. When something goes wrong with the system, you will see a displayed error code. There are currently over 80 error codes possible, with each one pointing to a different part of having a different meaning.
Because there are too many codes to cover here, the best advice is to use the Lennox diagnostics page. On this page, you can enter the error code you see. The page will return results that show you what is causing the code, diagrams, diagnosis and repair options, and more. They cover every possible Lennox code, and you can have your system back up and running in no time.
Lennox Heat Pump Making Loud Noise
Loud noises coming from your heat pump need immediate attention. If you hear loud noises while the system is running, turn it off as soon as possible. This is most likely caused by debris (ice, stick, etc.) that entered the fan area, and the fan blades are hitting the object. The debris needs to be removed before it causes damage to the fan blades.
Conclusion
Lennox heat pumps are among the most reliable, professional, and efficient heat pumps on the market. While their cost can get high for Signature series models, you can find affordable units with great features in their other lines.
If you have decided that Lennox is for you, the only step left is to pick the model you want that offers the SEER and HSPF ratings for your home. Finding the right size and capacity is crucial, and hopefully, this article has helped you identify which models will work best for you.
Our Rating: 
(4.7 / 5)
