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Read MoreWhen I first saw ductless air conditioners, they were a mystery to me.
“That thing’s cooling the air in here… without a duct?
How?!”
My curiosity got the better of me, and I’ve researched what a ductless mini-split ac is, how they work, and how to get the most from them.
To make a long story short:
Ductless Air Conditioners work like standard air conditioenrs. Rather than ducting out hot air, they cool the air in a room and only remove the warm refrigerant. Via a small tube instead of a big duct. The refrigerant is cooled outside, before being passed back to the ductless unit inside.
That’s the quick version, but there’s much more to it. Read on for a fuller explanation with (amazing) illustrations below. As well as pros, cons, installation advice, and best practices.
Let’s start off by considering a traditional air conditioning system. The general process is as follows:
A (rudimentary) diagram of a traditional air conditioning system.
Now, let’s consider the system in a mini-split AC. Note that the only difference is where things happen. The cooling happens inside the unit in the room. It’s the refrigerant, not the air, that gets transported back and forth.
The new steps are numbers 4 and 6.
How a mini-split air conditioning system works. The tube is much smaller than an air duct.
Okay, that was a lot of steps! Let’s try and simplify it a little bit.
To make a long story short:
A traditional ac system takes hot air out of the living room. It puts it into a central unit. It works it’s magic. Then cold air is sent back into the living room. Done!
A mini-split ac system sits in the living area and takes in hot air. It works a bit of magic. Then cold air is put back into the living room. At the same time, warm gas is sent through a small tube to an outside unit. The other half of the magic happens. Cool liquid is then sent back into the indoor unit.
To make a short story shorter:
Instead of moving hot air around, a mini-split moves refrigerant liquid and gas around. This needs a tiny tube, instead of a big air duct.
If you’re weighing up whether to pick up a ductless mini split vs a central ac system, sometimes it can help to consider the pros and cons. I’ve put all the main points in the table below. Hope it helps.
Mini-Split Air Conditioners | |
---|---|
Pros | Cons |
Can control cooling per room |
Doesn't bring in fresh air |
Better/cheaper if retrofitting without ductwork |
More expensive than ducted systems (if you have ductwork) |
Easier to install. Doesn't weigh much. |
Visible inside the home. |
Multiple options - wall mounted, ceiling recessed, etc. |
May need multiple to cover whole home. |
Often comes with heater element for winter. |
|
20-30% more efficient than central AC. |
|
Quieter than central AC. |
Mini-Splits can cover multiple areas in your home. The way these are split up is (thankfully) quite simple.
A ductless system is made up of indoor units and outdoor units.
The indoor units cool the air, while the outdoor unit cools the refrigerant.
A multi-zone mini-split system has multiple indoor units for one outdoor unit. Typically up to 4 indoors for each outdoor. The indoor units all send their warm refrigerant. The outdoor unit fans out the warmth, cools the refrigerant, and sends it back to each indoor unit.
A basic multi-zone system. Up to four indoor units can operate from one outdoor unit. Indoor units may vary in size/power depending on room size.
If you want your mini-split system to cool your whole home, you will need multiple units. So how many do you need? Well, that’s up to you!
A better question is how many rooms do you want cooled?
Generally, you should expect each mini-split unit to cool the room it’s in. If you cool all the main large rooms, then your whole home will feel the benefit. The question is, which rooms do you need to cool?
There’s two factors to consider here:
It doesn’t make sense to cool your whole home if you only use one room at a time! If you and your family are typically just in 1 or 2 rooms, it makes sense to target your cooling there. You’ll save tons on energy bills compared to cooling your whole home.
If you do want your whole home cooled, focus on covering the larger rooms. Especially the downstairs, and any main bedrooms. Remember that, typically, 4 indoor units can be handled by 1 outdoor unit.
Once you have an idea of what you need, always consult a specialist before going ahead with a whole-home system.
To get the highest efficiency you can, you’ll want to find the optimum size of mini-split unit for each room. So let’s consider…
The power you need from your mini-split unit depends on the size of your room. As a quick rule of thumb, you can estimate the requirement by doing the following:
Area of Room in Feet (Length x Breadth) x 25 = BTU Required
For example, a 18′ x 14′ room roughly needs 18 x 12 = 252sq.ft. 252 x 25 = 6,300 BTU per hour of cooling.
As a quick rule of thumb, follow the table below:
Room Size (sq. feet) |
Cooling Required (BTU) |
---|---|
Up to 250 | 6000 |
Up to 300 | 7000 |
Up to 350 | 8000 |
Up to 400 | 9000 |
Up to 450 | 10000 |
Up to 550 | 12000 |
Up to 700 | 14000 |
Up to 1000 | 18000 |
However, there are some adjustments to be made!
The above ratings are rough estimates for a standard room with standard height ceilings. It’s not exactly a cover-all!
Take a look at these extra factors below, when figuring out the power you need for each room:
This great diagram by Senville.
In-case you can’t quite read it – adjust your BTU requirement by the following:
Again, always confirm with a specialist before you proceed with buying and installing an HVAC system!
I hate this analogy – but how long is a piece of string! System costs can vary from anywhere between a few hundred dollars and over $10,000. This depends on factors like:
The best way to find out is to figure out what you need, and contact your local HVAC specialists. Or, alternatively, shop around online using websites like Amazon. They often also give you an estimated rate for installation, too.
Mini-Split Air Conditioners are a genuine revolution in the HVAC industry. Instead of complicated, maintenance-prone ducting, modern homes are often being built around ductless systems instead.
I hope this guide has helped you understand how they work, and what you need if you’re looking for a system of your own.
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Have a great day!
-Craig