Heat pumps are highly efficient HVAC systems that work year-round to maintain the temperature in our homes. Much like a central AC system, they can cool or heat, as needed, to keep you comfortable at all times.
The main problem with heat pumps is finding the right brand and model for your home and specific needs. This article will cover the Mitsubishi heat pumps, review, compare and explain their various models. We will also cover troubleshooting and efficiency ratings to help you fully understand how a heat pump works.
Mitsubishi Heat Pumps – Are They Worth The Money?
Since 1870 Mitsubishi has pioneered the way we see technology and appliances. Their long-standing tradition of excellence only increases with each passing year. Starting with founder Yataro Iwasaki, the Tsukumo Shokai Shipping Company survived World War 2 to become the world’s leading manufacturer of highly technological HVAC systems.
Not only are Mitsubishi heat pumps any good, they are among the best in the industry. With inverter-driven compressors, infrared technology, and a mindset for environmentally friendly systems, they lead the way into the future. That starts with some of the most impressive heating performances and highest SEER ratings on the market.
Understanding SEER, Tonnage & HSPF Specs
Seasonal Energy Efficiency Ratio, or SEER, is the rating given to cooling appliances to measure their overall efficiency. The higher the SEER number, which is the ratio between wattage intake and BTU cooling output, the more efficient the machine.
For heat pumps, a good SEER is anything over 16. 18 to 20 SEER is considered great, and 21+ SEER is excellent. Heat pumps, though, also heat homes, which is measured differently. The Heating Seasonal Performance Factor, or HSPF, measures wattage ratio in and BTU for heating out. Again, the higher the HSPF, the better.
You also want to pay attention to the measurement known as tons. A ton is the equivalent of 12,000 BTUs. A heat pump rated at 1 ton has a 12,000 BTU output, efficient enough for homes up to about 600 square feet.
Most heat pumps fall between 1 and 5 tons (60,000 BTU) and can accommodate homes from 600 to about 3200 square feet. Larger homes will need multiple units. However, mini-split systems can house up to four (sometimes more) wall cassettes, each with its own BTU rating or tonnage.
Mitsubishi Heat Pumps: Compared
Mitsubishi offers over two dozen different models, each with its own size, tonnage, SEER, and HSPF ratings. We compare the most popular models in the chart here to let you see a side-by-side comparison.
We also take the average Mitsubishi unit with a single outdoor unit, single wall cassette (or duct where applicable) from each model line to show you an approximate price for the unit itself and the installation costs as well.
|Heat Pump Model||SEER||Ton||Home Size||Compressor Type||HSPF||Energy Star||Cost (Unit Only)||Cost + Install|
|Mitsubishi MXZ-3C24NA2||20||23600||1800 sq. ft.||Variable Speed Inverter||9.8||Yes||$2500||$4500|
|Mitsubishi MXZ-5C42NAH2||19||40500||2900 sq. ft.||Variable Speed Inverter||11||No||$3300||$5000|
|Mitsubishi MXZ-8C48NAHZ2||20||48000||3000 sq. ft.||Variable Speed Inverter||11.5||Yes||$3500||$5200|
|Mitsubishi MUZ-FH06NA||33.1||6000||450 sq. ft.||Variable Speed Inverter||13.5||Yes||$1300||$3000|
|Mitsubishi MUZ-FH18NA2||21||17200||1500 sq. ft.||Variable Speed Inverter||12||Yes||$1900||$3900|
|Mitsubishi PUZ-A30NHA7||19.6||30000||2500 sq. ft.||Variable Speed Inverter||10||No||$3000||$4800|
|Mitsubishi SUZ-KA30NAHZ||15||30000||2500 sq. ft.||Variable Speed Inverter||8||Yes||$3000||$4800|
|Mitsubishi MSZ-GL09NA||24.6||9000||600 sq. ft.||Variable Speed Inverter||12.8||Yes||$1540||$3500|
|Mitsubishi MLZ-KP09NA||28.2||9000||600 sq. ft.||Variable Speed Inverter||10||No||$1540||$3500|
Mitsubishi Heat Pump Reviews
Mitsubishi is a top-tier company and has done its best to get there. Over the last five decades, the company has grown by leaps and bounds and doesn’t sacrifice quality to save money. Each model uses the top-end inverter compressors for variable speed controls and much higher efficiency levels.
Instead of separating their models by compressor type (as there is only one), we divide them by the number of capable zones the systems can control. We also look at heat pumps with wall mounted air handlers and ducted systems with ceiling cassette vents.
Multi-Zone Heat Pumps
Multiple zone systems are among the most efficient available. With the top models exceeding 30 SEER, it is hard to find a viable heat pump with higher SEER values. However, what is important to note, that not all of these systems are Energy Star certified.
If you plan to qualify for the tax credit (see further below), the system must be Energy Star certified. That aside, though, these systems can hold 2, 3, 4, or even 5 separate indoor units per heat pump.
For the higher quality models, each indoor unit can handle up to 40,000 BTUs and can heat or cool large spaces. The MXZ models are all multi-zone systems, with the 8C48NAHZ2 model topping the list.
The MXZ-5C42NAH2 model is the middle unit that combines more cost-effective pricing and high SEER ratings. With a 19 SEER and 11 HSPF, it is also the only model not Energy Star rated in this line. The MXZ-3C24NA2 is the best option, though, as it has a higher SEER rating and is Energy Star rated.
These models are also quiet, low maintenance, and offer you incredible performance in all weather conditions, temperatures, and modes. The 10-year warranty is standard, with options for extended warranties possible depending on installation options and retailers; you may even find a better deal.
Single-Zone Heat Pumps
The single-zone systems don’t have high BTU output capabilities, as they are only designed to control the temperature in a single room or series of openly connected rooms. While the condenser unit outside is fully capable of handling multiple air handlers, they are not set up to do so.
The interior units are capable of heating and cooling spaces from 450 to 3000 square feet. It is also important to note that like the multi-zone series models, not every one in the lineup is Energy Star rated. Specifically, the PUZ-A30NHA7, a popular model for its cost and ease of maintenance, is not certified.
These models are among the quietest in the industry, with average noise levels in the low 50dB range. The low profile systems are also easy to install, which keeps the labor costs down, and much lower than some other brands that can reach over $10,000.
The warranty starts with a 5-year on all parts and 7-years on the compressors. However, if you register your purchase within 90 days, those are both extended to 10-years.
Heat Pumps With Wall-Mounted Air Handlers
The wall-mounted air handlers are exceptional at heating and cooling a room. Partly because of the Mitsubishi hyper-heat system, the heat pumps can function to heat a room in temperatures as low as -20 degrees (Fahrenheit).
The wall mounts are also the easiest to install. There is no ducting involved, which makes everything much easier to run. The install through the walls only needs to be large enough to run refrigerant lines and thermostat wires through, which can be done much smaller than you may expect.
When you match the correct wall cassettes with the condenser outside units, you can add an air handler to each room and run the system year-round for much less than it would cost to upgrade a central AC system.
Like all Mitsubishi heat pump options, you do get the 5/7-year warranty without any registration requirements. Further, because the air handlers and refrigerant lines come precharged, DIY install is optional.
However, Mitsubishi will highly recommend Mitsubishi’s Black Diamond professional installation. This is a program where Mitsubishi certified and trained dealers perform all installation and maintenance.
Ceiling-Cassette Indoor Heat Pumps
The Ceiling cassette systems are ducted and are the ideal upgrade from an existing AC system. These can use the current ducting in your home for a cheaper install. The difference is that some ducting will need to be altered to move from the floor or wall to run to the ceiling where the recessed cassettes are located.
Because these models are highly efficient, they are very popular. The most difficult thing about them is finding a model that is in stock. It is best to find a licensed contractor to hire for the install and have them make an order for the system you desire.
It is also important to note that these systems are near-silent, with average noise production below 50dB. You also will find some of the highest efficiency ratings of all split systems with ducted heat pumps. The MLZ-KP09NA, for example, has a 28.5 SEER rating and will cool spaces up to 600 square feet per cassette.
The warranty is also the standard Mitsubishi 5/7-year warranty without registration. If you register your purchase within 90 days, you will get a 10-year warranty extension. This warranty does not cover labor, though, which is where a labor warranty from your contractor will come into play.
Choosing The Right Mitsubishi Heat Pump
When it comes time to pull out the credit card and buy your heat pump, there are a few things you need to consider before you enter your PIN. Choosing the right heat pump is more than model and brand selection.
You must consider the heat pump size. Tonnage is critical to get the most efficient use of the machine. If you buy a system that is too small, it will run constantly trying to reach temp. If it is too large, it will pull more power than is needed and run a shorter cycle which causes premature burnout of the internal parts.
Of course, you also need to consider the SEER and HSPF ratings. High ratings are great but may not be what you need. The balance between size, efficiency, and cost is a delicate balance but an important one. Just because a system is the highest efficiency rating doesn’t mean it will be the best solution for your home.
Noise levels are also a concern. Many premium brands offer noise reduction systems (covers, blankets, insulation, etc.), but they come at a cost. You want to have a machine that is quiet enough to not be disturbing (anything less than 65dB, for example) but still affordable enough to not break the bank.
The actual cost and warranties are important as well. The unit cost increases with technologies, features, and enhancements. Some you may need, and others you can live without. Finding that perfect model is crucial to your budget.
The warranty is also important as it will cover your heat pump in case of damage or issues. Make sure you know what is covered, for how long, and most importantly, the requirements and expectations on your part to fulfill the warranty claim.
Mitsubishi Heat Pump Maintenance: What’s Involved?
When it comes to homeowner maintenance, heat pumps are relatively light on the workload. There are things that must be done, though.
- Change your air filter.
Depending on the type and style you use, you may need to change the filter once a month or every 3 months. Whatever it is, though, you need to stay on schedule and keep the air filter changed to maintain air quality and airflow for the system.
- Clean the outside unit.
This needs to be done twice a year. Before the winter season and before the summer season, you need to clean the coils, pump housing, and fan. Using a garden hose and a soft brush can help dislodge any stuck-on debris. Keep the drain area clean and remove any leaves that can potentially block the coils.
- You also want to check the drain pan on the interior units (if equipped).
Drain line clogs and pan overflows are easy to prevent but can be costly if not taken care of.
- Once a year, you need to hire an HVAC professional to inspect the system.
This usually lasts about two hours and costs about $150 to $300 on average. Many warranties require it, and even if not, the peace of mind you get from a properly inspected unit working at top capacity is always a great trade-off for the expense.
Receiving HVAC Rebates & Tax Credits
The 2018 federal tax credit program has been extended to cover all of 2017 and lasts through December 31, 2021. This program is an incentive to purchase and install a highly efficient HVAC system in your home.
For heat pumps, qualifying installs will receive a $300 tax credit. Qualification is fairly straightforward, too.
- You must be the homeowner of an established home and live at the residence. Rentals and new construction do not qualify.
- The heat pump must be Energy Star certified and professionally installed.
- For split systems, the heat pump must meet a minimum of 15 SEER and 8.5 HSPF ratings.
- Package systems must meet a minimum 14 SEER and 8 HSPF rating.
- Tax form 5696 must be filled out and filed with your income tax returns, proving purchase and installation before December 31, 2021.
Calculating A Heat Pumps True Running Costs Per Hour
Running costs can be calculated to a reasonably close number. However, they aren’t exact. To be exact, you would need to predict exact temperatures, humidity levels, percentage of efficiency loss due to dust build-up, degradation of air filters over time, and other things we really can’t calculate easily.
However, with the right formula, you can get close enough for an average cost on an hourly, daily, or monthly basis. That formula takes four variables into account to give you the running costs that you need.
First, you need the wattage (in kilowatts) of the system. You also need to know how much you pay per kilowatt-hour for electricity. Next, you need to know (or guess) how many hours per day the unit is actively running (drawing electricity) and how many days you want to know the cost for.
That formula looks like this: kW x $kWh x hours x days
For example, if we have a 4200 watt system (4.2 kilowatts) and we pay 12 cents per kilowatt-hour, we can guess that during summer, our system will run for 5 total hours per day, and over the summer months, which is a 90 day period. The formula with variable will then look like: 4.2 x $0.12 x 5 x 90 = $226.80
Professional Installation: Is It Worth The Cost?
Hiring a professional HVAC contractor for your heat pump install is always a good idea. There are many benefits to hiring a professional that far outweigh the cost or expense it incurs.
One of the top benefits is the assurance that the heat pump will be installed properly and set up correctly. Heat pumps aren’t a difficult install for those trained in doing so, but knowing the proper angles, mounting positions, and connection areas is critical to getting the most performance out of the machine.
Another benefit is that your warranty is ensured to be upheld. Many brands don’t make a stipulation on installation; however, some do. Even if installation isn’t directly covered, many warranties will require professional inspection and annual checks to maintain warranty integrity.
Professional installers also come with the proper tools and equipment for the job at hand. The materials cost to do a proper installation yourself can end up being more than hiring a professional. Pros also bring years of experience, knowledge, and expertise.
On top of all that, professional contractors will (should) offer a labor warranty. This is great if something does go wrong in the future. Not only will the unit warranty cover the cost of the parts, but the labor warranty can cover the cost of the labor to perform the repair.
Mitsubishi Heat Pumps vs. Other Heat Pump Brands
Mitsubishi is a well known brand around the world, and while their heat pumps don’t have the following of some other brands, they are still worthy of any comparison. Here, we compare Mitsubishi heat pumps versus those of Fujitsu and Carrier.
Bryant Vs. Fujitsu
Fujitsu heat pumps haven’t been around as long as Mitsubishi, but that has little to do with their technological advances. Both companies excel in their mini-split designs and offer some of the highest SEER ratings in the industry.
Mitsubishi has a slight advantage in noise reduction and overall durability. When it comes to reliability, though, the two brands are on equal footing. You will also find that as an average across the brands, they also share similar SEER and HSPF ratings.
Fujitsu, though, has a lot more options. Compared to the two dozen models from Mitsubishi, Fujitsu has a combined four dozen or more. This, of course, is due to the mix and match style of the Fujitsu set up where you can have single zone up to 5-zone models, each with a different air handler, ducted or ductless, and other configurations.
Mitsubishi also has a mix and match style, but many of their units are cool only, and as such, removed from this review. All told, for the cost, Mitsubishi has a more cost-effective lineup while Fujitsu offers you variety and more options.
Bryant Vs. Carrier
Carrier is easily the top most recognized brand in the HVAC world. It also stands to reason that the Carrier heat pumps are also well known, popular, and affordable. However, they also have a lot of models that are designed for higher budget ranges.
Mitsubishi isn’t the cheapest brand of heat pumps around, but compared to Carrier on a model by model case, they are about even. Overall, though when you take the brands as a whole, Carrier is cheaper, having more lower-end options to choose from.
Mitsubishi has much higher efficiency ratings, though, and this is due to the ductless mini-split systems they offer, which have incredibly high SEER ratings. Mitsubishi is also quieter, has a slightly lower installation cost, and has more set up and design options.
Carrier has a more comprehensive warranty, offers more affordable units if you are looking to save money, but does have higher cost models on the top end.
Mitsubishi Troubleshooting Guide, Tips & FAQs
In this section, we will look at common issues with Mitsubishi heat pumps and cover potential fixes. We also answer some of the most common questions about Mitsubishi heat pumps in general.
Mitsubishi heat pump stopped working
When the Mitsubishi heat pump stops working, you have to diagnose what is not working. Many factors work together to make the system go. You need electricity for the system, motors need to spin, refrigerant needs to circulate, and even a thermostat needs to control the system.
You need to check the thermostat and ensure the temperature, mode, fan, and power are all set correctly. After that, you need to check the air filter for proper airflow, replacing it as needed. Next is to check the circuit breakers and ensure the breakers controlling power to the heat pump have not been tripped.
After that, you can check the coils for dirt, clogs and obstructions, or even ice. If there is ice, see below. Otherwise, clean the dirty coils and check for proper operation. Otherwise, you should call in an HVAC technician for further inspection and diagnosis.
Mitsubishi split system heat pump not heating
If you find that your heat pump is not heating, there are a few things to check and self-diagnose. First, as always, you want to check the thermostat. It is surprisingly easy to accidentally switch a thermostat to the cooling mode when you need heating mode. This is made easier with smart thermostats, cellphone and remote operations, such as we find with heat pumps.
If the thermostat is set and working correctly, you need to check airflow next. The vents and air filters are commonly blocked, dirty, clogged, or damaged. Replace or clean as necessary to restore proper working order.
If these do not solve the problem, you need to check the outside unit. If there is ice build-up, see below. If the system is overheated, you can test or check the fan motor or compressor for proper operation. If there is no ice and the fan motor and compressor are working properly, it is time to call a professional for a deeper diagnosis.
Mitsubishi heat pump trips breaker or freezes up
If the heat pump trips a breaker constantly, there is a major power draw somewhere in the system. In most cases, this is due to a compressor being overworked. This can be caused by a burnt fan motor, low refrigerant levels, or improper airflow.
The first and easiest is to check the thermostat and air filter for proper operation and dirt or clogs. After that, you need to inspect the blower motor in the air handler (if equipped) and the condenser fan for stuck or improper operation. One check is to carefully touch the motors with the back of your hand to see if it is overheated.
If it is, you need to shut the system down and call a professional to diagnose which wire or contractor is at fault.
If there is ice on the condenser coils or compressor, this means you are low on refrigerant. At this point, you must call an HVAC technician, who will locate the leak, repair the leaking area and refill the system to proper refrigerant levels. This must be done with a licensed professional for legal reasons.
Mitsubishi heat pump blower doesn’t run
If your heat pump blower isn’t working, air will not move into your home. The most common cause for this is a burnt blower motor. You can visually inspect the motor, looking for burnt wires, broken connections, or carefully feeling for overheating.
However, unless you have experience working with 220-volt electrical circuits and electrical motors, you need to call in a professional to find the exact cause of the burnout and replace the motor.
How do I reset my Mitsubishi heat pump?
Most Mitsubishi heat pump mini-split systems have a reset button on the bottom of the unit. Before you press the reset button, though, double-check the circuits that control the heat pump and ensure they aren’t tripped.
Once you have reset the breakers, you can press the reset button to allow the system to restore power and proper working order.
Mitsubishi heat pump replacement parts?
You can find replacement parts through any Mitsubishi dealer or installer. You can ensure you get the correct part if you use the same contractor that installed your unit. However, if you are after a simple part or a smaller piece, you can find what you need on Amazon and Sylvane.com in most situations.
Mitsubishi heat pumps are durable, reliable, and easily maintained. They also offer some of the smallest footprints and easier installations in the market. As this Mitsubishi review has shown, there are plenty of models for almost every budget available.
However, if you feel that Mitsubishi is not right for you, we have reviews of other heat pump brands for you to browse and find the right one. Mitsubishi, though, offers some of the highest SEER ratings and the most economical ductless systems around. We are positive there is a model for you here.
Our Rating: (4.2 / 5)
Last Updated on January 19, 2022
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