Sometimes you just have to throw in the towel.  In the home comfort business this occasionally happens.  If you have a hot, uncomfortable room there is only so much you can do.  As I discussed in Part 1, you can try to keep the heat out by adding radiant barrier, insulation, attic ventilation or sealing open chaseways.  Or, pull more heat out by adding more airflow usually with larger ducts or additional air conditioning returns.

External unit of a ductless mini-split

External unit of a ductless mini-split

Sometimes you can do all this plus more and STILL have comfort issues.  It may never get comfortable or it’s freezing one minute and then too hot a few minutes later.

If you have given up and are ready to throw in the towel, then take another approach. You may  benefit from a Ductless Mini-Split Air Conditioner.  What’s a Mini-Split?  The best description is a  window air conditioner WITHOUT the window. If you have ever traveled to the Caribbean or the Orient you see them EVERWHERE.  The most common brands are Mitsubishi Mr. Slim, Sanyo, Daikin, LG, and Fujitsu just to name a few.

Ductwork is a very western idea. By using a ductless mini-split, you can easily bring more air conditioning (heat removal) to either an interior space or an exterior room without a noisy window unit.

Diagram of how a mini-split ductless system works

Diagram of how a mini-split ductless system works

An air conditioner basically has three parts: 1) Compressor 2) Fan 3) Coil. A window air conditioning unit has all three together.  In a ductless air conditioner, the compressor is OUTSIDE and the fan and coil are INSIDE usually connected by a ¼” or 3/8” copper tubing.  The beauty it that the inside unit can be as far as 100 feet from the outside condenser.

Installation is pretty simple since there is usually NO electrical requirements for the inside fan coil.  Power to the inside unit is brought from the outside unit along with the refrigerant lines.  This means that basically you can drill a hole in a wall, run a 3” bundle of copper tubing, hang the indoor air handler on the wall, connect condensation tubing, set the outdoor unit, connect power and just like magic supply additional cooling and heating to any problem area.

Inverter vs. Non-Inverter Units

WARNING:  Mini-split air conditioners all look very similar but operate very differently. Traditional air conditioner units act like light switches – they are EITHER ON OR OFF.  They turn on, run for a while and turn off.  A mini-split with inverter technology acts like a DIMMER switch that automatically adjusts based on the required “load”.

Indoor portion of a ductless mini-split system

Indoor portion of a ductless mini-split system

Inverter air conditioner units have several advantages.  First of all being comfort.  You will not have a big “swing” between feeling too cool and too hot.  Second is dehumidification.  By running longer at a lower level the inverter will pull more moisture out of the air resulting in better air quality and a “crisp” feel to the air.  Another advantage is energy efficiency.  Inverter air conditioners operate at a lower amperage and do not cause spikes in demand charge or light flicker when starting up.  Finally, the best feature of installing a mini-split air conditioner is CONTROL.  Whether it’s a bedroom, office or media room, you will be able to keep it cool and comfortable without having to cool the entire house.

Mini-split air conditioners are the fastest growing segment in the air conditioning industry.  Ease of install, efficiency, improved comfort and better dehumidification are just a few reasons never to throw in the towel on keeping comfortable.

Read Part 1: Hot Rooms in my House, How Do I Make Them More Comfortable?

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3 Comments to “Hot Rooms In My House – When All Else Fails – Part 2”

  1. watcharaaircon says:

    This air condition has very good power saving.
    But do not know how to install.
    Thank you for sharing knowledge.
    You can read how to save energy from air conditioning.

  2. Thanks for the information about split air conditioning. We’re looking at moving into an apartment that has one of these, so I want to know what to do with it. I’m glad that we don’t need a loud window unit, like you said. Those aren’t fun.

  3. Tim Yaotome says:

    I am glad that there are several types of air conditioning to choose from based on your article: non-inverter mini-split or an inverter mini-split. What got me the most is that having mini-split air conditioning is having both the fan and coil unit inside the actual room while the compressor is outside, both connected by a tube. If I needed this system installed in my room, I would ask the help of a professional. Not only will they be able to give advice whether or not this system is appropriate for a room but also suggest alternatives in case it will not work.

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