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A mini-split system can greatly improve home comfort, but only if you choose the right model. Many homeowners struggle with this decision and the factors to consider.
That's why I've created this guide, sharing the key questions I consider when recommending units to clients.
Follow these steps to find the best mini-split system for your home.
Step 1 - Do you also need heating?
A traditional mini-split provides air conditioning, but areas with cold winters and hot summers (like the Northeast or the Mid-West States) usually need heating and cooling.
In these situations, I recommend a mini-split heat pump.
Mini-split heat pumps are energy-efficient systems that can switch between heating and cooling modes, effectively managing temperature throughout the year.
Most modern mini-splits operate on this principle, and you can find a list of top mini-split heat pumps.
If you only need cooling, a standard mini-split AC system will work just fine and is typically 10-30% less expensive.
Step 2 - How many units would you need (How many rooms)
One of the most significant advantages of mini-split systems is their flexibility.
Some models allow you to install multiple indoor units to tailor the system to your needs, making them a cost-effective alternative to central AC systems.
When choosing your system, you'll need to choose between single-zone or multi-zone units based on the space you want to cool:
These tables below show the differences, advantages, and drawbacks.
Single-Zone Mini-Splits | |
|---|---|
Best for | Individual rooms or smaller areas. |
Description | A mini-split heat pump with one indoor unit controlling the temperature in one room or space |
Benefits | Simple installation and lower upfront costs |
Drawbacks | Less versatile |
Brand I recommend | Mitsubishi M Series |
Multi-Zone Mini-Splits | |
|---|---|
Best for | Multi-room applications or larger homes with diverse temperature needs. |
Description | A mini split heat pump with one outdoor unit and multiple indoor units (usually 2 to 5 air handlers on residential systems) |
Benefits | Flexible zonal heating for different parts of your home, customizable comfort |
Drawbacks | More complicated and costly to install |
Brand I recommend | Daikin Multi-Zone Series |
Step 3 - Choosing the right capacity for cooling/heating
How many rooms need cooling and what BTUs do I need?
A big mistake I see homeowners making is buying the wrong size mini-split for their home.
The size of the space you’re cooling/heating should match the BTU (British Thermal Unit) mini-split capacity.
The BTU rating is the output of the mini-split, and larger spaces or multiple rooms require a higher BTU output.
There are two types of BTU rating:
- 1ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers). These are typically higher and based on ideal conditions.
- 2SACC DOE (Seasonally Adjusted Cooling Capacity, Department of Energy). These ratings are newer and adjusted for real-world conditions like temperature and humidity.
ACLAB note:
I prefer SACC DOE ratings because they are more accurate, but ASHRAE BTU ratings are the typical ratings used in specifications, so I tend to use those to compare models.
You should see the BTU output clearly in the mini-split specifications.
How to calculate the BTU capacity you actually need
This table shows approximate BTU requirements for different-sized rooms:
Area (square feet) | BTUs needed |
|---|---|
150-400 | 5,000-9,000 |
400-600 | 9,000-12,000 |
600-1000 | 12,000-18,000 |
1000-1500 | 18,000-24,000 |
1500+ | 24,000+ |
ACLAB note:
As a general rule, I add 25% more BTU for high ceilings and 20% more BTU for poorly insulated spaces.
This is the general guide I use, but I follow these 3 steps to determine the BTU capacity in different homes:
1. Measure the spaces
I start by measuring the square footage of the space being cooled/heated. If the mini-split is covering several rooms, I measure them all and combine them.
I don’t usually measure the ceiling unless it’s different from standard measurements (around 8 feet).
2. Determine basic BTU requirements
I use the following rules of thumb to determine the initial BTU requirements:
3. Adjust for specific factors:
An HVAC professional should perform a detailed load calculation and consider all relevant factors in your home, but this should give you a reasonably accurate idea of which size mini-split you need.
BTU power unit options available
Residential mini-split systems range from 6,000 to 50,000 BTU. In my experience, most homes only need 18,000 to 24,000 BTU, but the output you need will vary depending on how you plan to use it.
The table below shows the output range and best models in each category.
Mini-Split Size | BTU Range | Typical Use | Best Model(s) |
|---|---|---|---|
Small | 6,000 - 12,000 | Single rooms and small spaces | |
Medium | 12,000 - 20,000 | Larger rooms, small open areas | |
Large | 20,000 - 36,000 | Very large rooms, multiple rooms, open floor plans | |
Extra Large | 36,000 - 50,000 | Small homes, multiple rooms |
Step 4 - Do you need smart functionality?
Smart features make the mini-split easier to use and more effective, particularly in busy homes.
You can pre-program your system to cool the house before you arrive home or maintain a comfortable temperature for your children or pets.
The features I look out for include:
I appreciate smart appliances and find Mitsubishi, Daikin, Seville, and Gree the best brands for tech-savvy users.
If you prefer simple operation and controls, I recommend the Rovsun Standard series.
You can also DIY smart upgrades, like adding an infrared smart thermostat (Sensibo Sky or Ambi Climate) or a smart plug for energy monitoring.
ACLAB note:
I find integrated features offer the best experience, and it’s worth paying a bit more if you value advanced functionality.
Step 5 - Understand the types of indoor units
Choosing the right indoor unit for your space can make all the difference in comfort and efficiency.
Here are the main options and what I recommend for different types of homes:
Wall mounted mini split
These are the most common and versatile options. These units are installed high on a wall, efficiently distributing air throughout the space.
They’re easy to install, don’t take up any floor space, and are ideal for smaller rooms.
I like these for their direct airflow, convenience of installation, and unobtrusive design.
Key highlights:
Ceiling mounted mini split
Ceiling-mounted mini-split systems, sometimes called cassette units, are good for larger spaces with limited wall space.
They're installed in the ceiling, making them less intrusive, and I tend to rooms that see a lot of use where the AC system needs to be out of the way.
Installation can be expensive, but ceiling-mounted units distribute air well in large, open spaces.
Key highlights:
Ducted mini split
Ducted mini splits are installed within the ceiling or floor, with only small vents visible.
They operate similarly to a central AC system, and I only install them for multi-zone cooling across homes.
This setup is ideal for those seeking whole-home temperature control without impacting aesthetics but takes significantly more installation work.
Key highlights:
Floor mounted mini split
Floor-mounted mini splits are installed at the bottom of the wall. They work well in rooms with limited wall space or sloped ceilings and offer powerful air distribution.
I usually install these in homes where heating is the primary function, as they can efficiently heat lower parts of the room.
They’re also easier to access for maintenance and adjustments, which is ideal for beginners.
Key highlights:
Step 6 - Things you need to consider - Noise and energy efficiency
Noise levels
Mini-splits are generally quieter than other HVAC systems, with indoor units typically operating between 20-40dB and outdoor units at 40- 60 dB.
Higher-end models tend to be quieter, thanks to advanced compressors.
For bedrooms, I recommend models that run below 35dB for a peaceful environment. Slightly noisier models work better in living areas.
Mitsubishi and Friedrich are my top brands for noise-sensitive homes, with units that stay below 25 dB.
For the quietest option, I recommend the Mitsubishi MSZ-GS12-MUZ-GS12NA, which operates at an incredibly low 19 dB.
Most budget brands, like Rovsun (40-50dB) or Pioneer (30-50dB), are generally better suited for living areas.
However, there are affordable quiet options, like the 23 dB Rheem RIWH09AVSA. Always check the specs before buying to avoid a disruptively noisy model.
Energy efficiency
Mini-split efficiency is primarily measured by SEER (seasonal energy efficiency ratio) rating, typically ranging from 15-30.
I consider anything above 20 SEER highly efficient, though aiming for at least 16-18 SEER is a good standard.
Another key measure is the HSPF (Heating Seasonal Performance Factor), which shows heating efficiency.
HSPF ratings usually range from 8 to 13, with higher numbers indicating better efficiency.
A rating of 8 or above is generally considered efficient, with top-tier brands, like Mitsubishi and Fujitsu, often reaching 10-13 HSPF.
Higher HSPF and SEER ratings mean less energy consumption and lower utility bills.
The Fujitsu Airstage systems, like the Fujitsu 09LZAS1, are the most efficient I’ve worked with, reaching over 33 SEER and 10.3 HSPF.
Mitsubishi, Daikin, and Friedrich are also impressive brands, with models above 23 SEER and 9.5 HSPF.
Most efficient units cost more upfront but can reduce running costs by 5-10% per 1-2 SEER increase.
ACLAB note:
For long-term savings, I recommend investing in higher-efficiency systems.
Step 7 - Placement, power and venting installations
When choosing the right mini-split system, you need to consider the practical aspects of installation alongside the features.
I always check the weight, dimensions, venting, and electrical needs.
Weight and structural requirements
Mini-split systems vary in weight, with indoor units typically ranging from 15-50 pounds and outdoor units weighing 60-150 pounds.
It’s important to check the installation site can support the weight, particularly for mounted indoor units.
Most regular home walls will support a mini-split, but heavier units may require bracing or bracketing. Ceiling units often require reinforcement or specialized brackets.
I follow these general rules:
Proper structural support is crucial to prevent long-term damage and ensure safe installation.
For older homes or less sturdy walls, I recommend models with lightweight interior units like the Daikin RXL12QMVJU and OLMO OS-EL12ALP115V.Hole sizes for venting
All mini-splits need holes for venting, refrigerant lines, and drainage.
Almost every model I have worked with requires a 2.5- to 3-inch hole, but the requirement can vary depending on the model.
Always ensure a suitable space in the interior and exterior walls for holes close to each unit.
The HVAC professional fitting the unit will be able to help, but I recommend checking the mini-split specifications to understand the requirements before buying.
Circuit and amperage requirements
Mini-split systems need electricity, and I usually recommend a dedicated electrical circuit if possible. Here are the key things to consider:
- 1Power source for the outdoor unit:
Your outdoor unit must be close enough to your home’s electrical source to connect easily. This connection is typically handled by a professional, but make sure the location you choose allows for easy access to power. - 2Power source for the indoor unit(s):
Indoor units generally need to connect to an outlet, which can influence where you place them. In my experience, Mitsubishi and Daikin have the longest power cables, but it varies across brands. Check your chosen mini-split can reach an outlet without stretching the cord too far. - 3Wattage and circuit requirements:
Most mini-splits use between 600 and 2,500 watts, which is fine on a regular 15-20 amp breaker circuit. However, some powerful models (like the 4500-watt Pioneer WYS036GMFI17RL) will need a 30-50 amp circuit. I recommend getting a dedicated circuit and double-checking your breaker specs to ensure compatibility. - 4Voltage:
Most homes use 110-120V circuits, and most residential mini-splits match this voltage. But, larger systems might require a 220-240V circuit. Check your circuit breaker to see if your home can support the system you’re considering.
I recommend keeping these factors in mind when choosing a mini-split to keep the installation simple.
ACLAB note:
Your HVAC professional will handle most of the electrical work, but more complex setups can increase installation costs.
Step 8 - Who will install it?
There are two main options for mini-split heat pump installation; professional or DIY.
I typically recommend professional installation because the benefits outweigh the costs, but there are pros and cons.
Professional installation
I recommend professional fitting in most cases, but especially when buying any premium mini-split system.
Professional installation will help avoid any issues that impact the long-term value, ensure the system is set up correctly for optimal performance, and protect the warranty.
The downside is the upfront cost, which will vary depending on your location and setup. On average, it will cost:
Most brands have a directory of qualified HVAC professionals, and I recommend looking there first. You can also search national directories for accredited HVAC professionals.
Installing a mini split by yourself
While installing a mini-split yourself can save money upfront, I don't recommend it due to potential complications and warranty issues.
Most systems require professional installation, especially for handling refrigerant.
If you are experienced with large DIY projects and determined to self-install, choose a system specifically designed for DIY, like the MR COOL DIY-36-HP-230B25.
These come pre-charged with refrigerant and offer warranties that cover DIY installations.
For DIY installation, you'll need tools including:
Remember, while DIY can save money initially, it requires significant skill and carries risks.
ACLAB note:
Always prioritize safety and system efficiency when making your decision.
Step 9 - How difficult is it to maintain?
I've seen countless mini-splits fail prematurely due to neglect.
Trust me, regular maintenance is key to optimal performance and longevity.
Here's what you need to focus on and how it might impact your mini-split choice:
From my experience, Mitsubishi Electric mini splits, especially the Mitsubishi MZ-GS24NA and the MSZ-GL Series, are the easiest to maintain.
They have self-diagnostics, easy access, and durable components that stand up to heavy use.
Regardless of your model, always schedule annual professional check-ups to keep your mini-split in working order.
Step 10 - Consider the warranty coverage
A good warranty ensures peace of mind, saves money on repairs, and ensures better long-term value.
Most quality mini-splits come with 5-7-year parts and compressor coverage, with labor warranties varying from 1 to 3 years.
Extended warranties are usually available, and I recommend them for expensive systems, complex installations, or long-term use.
DAIKIN offers the most coverage with a 12-year standard warranty (with online registration) on almost every model, including the single-zone DAIKIN RXL12QMVJU and multi-zone DAIKIN 2MX18AXVJU.
Budget brands like Rovsun or Della offer minimal coverage in comparison.
I recommend at least:
Step 11 - Choosing the right brand
While brand name isn't everything, it can be an excellent place to start.
I find some offer better value and performance, and they typically fall into one of three categories depending on the price tag.
Ultimately, the choice will come down to your needs and budget.
The most expensive brand isn’t always the best.
ACLAB note:
I recommend clarifying your needs and speaking to an HVAC professional/dealer to find the right mix of performance, efficiency, and value.
Step 12 - How much do you want to spend?
Mini-split heat pumps can vary, ranging from $500 for budget models and $5000 for high-end units. When budgeting, you should consider:
If you have a flexible budget, I recommend a Mitsubishi, Daikin, or Fujitsu system because they offer the best long-term value.
If your budget is limited, look for Goodman, OLMO, or Rovsun models, which offer decent performance without the bells and whistles.
The model you choose will depend on your requirements, but the table below shows my top recommendations for different budgets:
Price Range | Recommended model | Warranty | Efficiency | Expected Lifespan | Best For |
|---|---|---|---|---|---|
Budget ($500-$1500) | 5-years | 18 SEER, 9 HSPF | 8-12 years | Small homes, basic heating/cooling needs | |
Mid-Range ($1500-$3000) | 12 years | 20 SEER, 12 HSPF | 12-20 years | Average-sized homes, more complex/regular heating & cooling needs. | |
Premium ($3000-$5000+) | 7-years (12-years with diamond contractor) | 25.5 SEER, 13.5 HSPF | 20 years + | Large homes, premium features, and high-efficiency |
Should you consider other HVAC solutions?
Mini-splits are often the best choice, beating central AC in cost and efficiency unless you have a large home with existing ducts.
For targeted cooling and limited heating, portable AC and window units can cost less upfront but are unsuitable for larger areas.
Mini-splits are usually my go-to choice and recommendation, but always consider your needs and budget before deciding.
