Ductless HVAC Unit

Ductless HVAC Unit

A ductless HVAC system, also known as a mini split, is a heating and cooling system developed to provide hot or cold air to one or more rooms without the use of connecting ductwork. A ductless mini split system consists of one outdoor unit and one or multiple indoor units called air handlers or Heating and cooling unit (HCU). These two units are connected by refrigerant lines and a power cabling system that are passed through a small conduit in the wall, which is usually three inches or less in diameter.

Depending on the type of installation, they are available in various forms. Indoor units can be wall-mounted, horizontally ducted, cassette-mounted in the ceiling, ducted, or floor-mounted. Ductless mini splits are more technologically advanced and energy-efficient than conventional systems in terms of their parts, functions, and features.

Mini split systems are an excellent choice for sunrooms, garages, and spaces that need to be heated or cooled in the house. They are the easiest systems to install and have more functions than the vents on a central air conditioning system.


There are various types of systems to select from, based on your personal preferences and inclinations. Due to the numerous benefits of a Mini Split system, choosing to have it installed in your home is a great choice. However, selecting the type of system you want to install requires a little more consideration. The various types of Mini Split systems you ought to be familiar with are;

Single-zone Mini Split

A single-zone Mini Split system is made up of single outdoor and indoor unit. It is structured to regulate the temperature of a certain room. It is also perfect for adding to your existing system or for heating and cooling tiny areas like single rooms.

The ideal applications of these ductless HVAC systems are to provide air conditioning for single rooms, expansions, and additional assistance for problem areas in bigger homes.

Multi-zone Mini Split

Multi-zone Mini Split systems comprise of two to four indoor units per condenser. Despite being connected to one another, each unit in a multi-zone system can function on its own and be set to a different temperature.

A multi-zone mini split system is made up of two or more indoor mini split units coupled to a single outside unit or compressor. Generally, up to eight indoor units can be linked to a multi-zone mini-split condenser or compressor. The number of indoor units you connect to a single compressor will mostly depend on how many zones you wish to heat or cool in your house.

Wall-mounted Mini Split

Wall-mounted mini split systems are the most popular Mini Split option due to being the least expensive choice. Usually, these mini-splits mounted near the top of a wall which must be six feet high. The ability of the Mini Split to heat and cool a room will be affected if it is set too low, which might prevent it from adequately circulating air throughout the space.

For a Mini Split system to function properly, they must be mounted horizontally on a vertical wall. If wall-mounted Mini-Split systems are mounted on a sloped wall, it won’t operate correctly. Also, installing the system near appliances that could cause electromagnetic interference, such as a microwave, should be prevented.

Floor-mounted Mini Split

Floor-mounted mini splits are similar to wall-mounted mini splits. The difference is they’re installed near the bottom of a wall instead of towards the top. They are perfect for homeowners who want to mount their Mini Split systems on the wall but have windows that are too high or ceilings that are too low for a wall-mounted split.

Ceiling cassette Mini Split

Ceiling Cassette Mini Split systems are typically mounted on the ceiling. They provide a wider air flow than most other types of systems due to where they are installed. Ceiling cassette mini splits are a great option for homeowners who don’t want their heating and cooling systems to occupy wall space and who want to keep them out of sight.

How Does Ductless HVAC Unit Work?

An understanding of how Ductless HVAC unit works is important to have before installing a new system or switching out your already existing system.

Ductless HVAC systems (also known as mini-splits) in basic terms, link individual room units to an outdoor compressor. The indoor unit contains evaporator coils cooled with refrigerant. Warm air from the room blows over and is absorbed by the coils. Afterwards, the refrigerant transfers all that inside heat to the outdoor unit.

A mini-split system installs tiny units directly in each room, which suck in warm air and send it out as cold air, as opposed to a central indoor unit connected by lengthy lengths of ductwork conveying warm and cool air back and forth. Some models may need to be installed on a platform to allow for adequate airflow, protect the unit from the elements, and prevent sinking and shifting.

 Mini-splits are a popular replacement for conventional air conditioners because they are less obtrusive during installation, better integrate into the space, are quieter, and use less energy.

Installing a Ductless HVAC Unit

The ease in which ductless air conditioning systems can be installed without need for extensive construction work is one of their major benefits.

The technician will first place the condenser unit on a concrete pad outside the house before making a tiny hole in the outer wall of the house for a conduit to run from the condenser to the air handler. This conduit holds the electrical wiring for the appliance as well as the lines for the condensate drain and refrigerant. The air handler must then be mounted above the wall hole once the conduit has been run.

Installing a single-zone mini-split typically takes a few hours. For multi-split systems, an additional two to four hours are typically required for each additional air handler. Whether or not you already have a sufficient concrete pad for the condenser unit might have an effect on how long the task takes. In the event that this is not the case, you must first have the concrete poured and wait a number of days for it to properly cure before initiating the installation.

Maintenance Tips for Ductless HVAC Units

Ductless air conditioners are one of the most efficient and cost-effective cooling options, and it is important that you keep yours in the best shape possible. While it might be easy to care less about the mechanism keeping your home comfortable, poor maintenance of your ductless air conditioner could shorten its life and greatly reduce its working abilities. There are a number of steps that you can take on your own to increase the functionality and lifespan of your system. Not everything should be left to a professional to handle.

Here are a few maintenance tips for ductless air conditioners to keep yours in the best condition to function efficiently.

Keep the Outside Clean

One of these simplest things you can do to keep your system functioning properly is making sure that it is free from dust. If you allow dust, dirt and other particles to collect on the unit, they can easily find their way into the operating pieces and ultimately lead to major issues.

Make sure your ductless air conditioner remains clean on the outside is to make sure to include the unit in your weekly dusting routine. Simply wipe down the exterior with a damp cloth or a gentle and safe chemical cleaner. Additionally, make sure that the outdoor portion of the vents are free from dirt and dust and anything else that could clog the unit and make it malfunction. This basic step can greatly reduce additional work and costs later.

Turn the System Off

Cleaning just the outside of the unit makes not be enough to ensure its optimal performance. Before completing the more extensive cleaning of the interior of the unit, always ensure that all the components are off. skipping this step, you very likely run the risk of damaging your unit, or worse, harming yourself through electrocution or other means. You want to make sure that you turn off both in-home components and the exterior circuit switch. Once you have shut the unit down, ensure you let it to cool for a decent amount of time. Starting too soon can also be a hazard to the system.

Clean the Filters

One of the most important components for checking the functionality of your ductless air conditioner is the filters in your HVAC unit. The efficiency of the filters can be reduced if they are not properly maintained. To clean your air filters, carefully remove them from the interior of the appliance. Clean the filters carefully by wiping them down with a dry, clean cloth. For details on how frequently to perform this activity, consult your handbook, but generally speaking, you should do this every four to six weeks for optimal benefits.

The filters play a significant role in improving the air quality in your house and safeguarding the remainder of your appliance from dust buildup. You might eventually need to replace the filters. Replace them if they are damaged or cannot be cleaned thoroughly.

Clean the Coil and Condenser

Keeping up with the exterior of your unit is very important. You should routinely repair the condenser and coils since they are crucial to the continuous operation of your system. This portion of your unit can easily become covered with outside dirt and debris, which will stop it from functioning. If neglected, it might stop the system from functioning entirely and do a lot of damage.

To clean, make sure that all the components are off and then use your regular garden hose to spray the unit. Once done, make sure that the fins did not bend, and if they did, you can use an alignment comb to return them to their original shape. You can then dust off any final debris by hand, and be sure that the unit is completely dried off when you’re done. This task should be added to your weekly cleaning routine to ensure that your ductless air conditioner regularly is checked.

Clean the Pipes

The pipes, which connect the machine's outside and interior parts, are crucial for distributing heat or cold throughout your house. If left unattended, debris such as dirt and dust can amass and prevent air from entering your house. Obviously, this renders your ductless air conditioner inactive. Additionally, leaks might form in pipes, preventing appropriate operation.

These pipes should be periodically inspected to make sure they are clear. Do not neglect this activity because it is simple to complete while you are cleaning your air filters.

Check for Ice or Snow

Ductless air conditioners can accumulate ice and snow when used for heating, which can reduce their performance. Check the outside of your equipment frequently for buildup, and if you find any, take care to remove it from the device. You will want to make sure that your unit is safe because you will probably operate it frequently during the winter. If you leave this area of the unit coated in ice, costly problems might arise very rapidly.

Call an Expert

A ductless air conditioner should be examined by a certified professional around once a year. They will check your drain hoses to make sure they are not obstructed and search for refrigerant leaks during this appointment. While there are many things you can do on your own to maintain the functionality of your unit, the importance of a professional can not be overly emphasized to ensure that everything is working as it should. Your drain hoses will be examined by an expert, who will also search for refrigerant leaks and make sure they are not obstructed. Also, they will test capacitors and look at the electrical connections. The specialists will carry out repairs or replacements if there are any problems with these parts in order to make your ductless air conditioner operate at its best.

Why Choose a Mitsubishi Mini Split Unit?

The Mini split cooling and heating industry credits Mitsubishi as a pioneer. If you want a company that knows quality, reliability, and dedication to their skill, Mitsubishi is that company. Some appliances under this brand incorporate electric belt heating, which distributes heat more quickly when they first start up and improves system efficiency in cold areas. Additionally, systems immediately resume if power is restored after a loss. Here are some of the benefits a Mitsubishi Mini Split Unit offers;


Your home may have nicer, cleaner air thanks to a whole-home system from Mitsubishi Electric Cooling & Heating. This is so that air filters may be used with the air conditioning systems. Some HVAC systems additionally contain a UV light that eliminates germs and viruses on contact. If it is not included with your unit, it can be purchased and added on.


Mitsubishi mini-split systems don't need ducts to function. This indicates that you won't need to make any changes to your home to install the equipment. Without the use of loud fans, these systems provide heated and cooled air directly to the rooms they are intended to service.

Without ducts, you also have the added benefit of less allergens and dust particles gathering and spreading through soiled ducts, and duct leaks won't affect the efficiency of your unit.


Utilizing a well-known brand like Mitsubishi has numerous advantages, one of which is the reliability of its continuous performance. Mitsubishi Electric will aid in maintaining the optimum indoor temperature while using the least amount of energy possible. By examining its SEER, you may determine the Mitsubishi mini-split system's energy efficiency.


Mitsubishi mini-split systems run at 19dB(A), a decibel level that is quieter than a person whispering. The noise level of background music or a restaurant discussion is 58 dB(A), which is the lowest operating level for outdoor equipment. You don't have to be concerned about loud, intrusive noise in your house or property.


You may separately control each zone in your house and even switch off any that are not in use. Just think of how much money you could save if you could turn the units off in areas you weren't in and just use them when you were there. Because each room has its own unit and controls, the Mitsubishi mini-split system allows you flexibility over where and when your unit operates.

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