Split unit air conditioning units with Inverter Technology are a marvel. When alternating current (AC) enters the unit through domestic wiring, it's *converted* into direct current (DC) . Then, a set of capacitors (which absorb the power spikes that are almost universal in AC current that comes from the electrical grid), create a clean and stable DC current, which is then *inverted* back to A/C current -- using transistors that control the number of cycles per second. (Sixty cycles is the norm.)`````With most motors, neither the voltage nor the amperage can be changed much at all. Changes of voltage and amperage will damage most electric motors. The beauty of Inverter technology is that the motor's capacity can be carefully, by reducing *the number of cycles per second* while the motor is running. During full cooling, just as the specified temperature is being reached, the motor slows down and the compressor is turned off. However, the coolant that has already been cooled continues to circulate gently, so that the cooling you paid for is at least used.The system maintains a much more stable temperature that common, ducted central air conditioning. Virtually no cooled air is wasted (i.e., left to get hot in ducting in a hot attic). For air conditioners, the power required to maintain a cool and comfortable space drops by about 60%.I live close to the Equator, so I'm less familiar with heat pumps in these units because it never gets cold here! Heat pumps are said to be very efficient, but they can be unable to heat, say, a poorly insulated house in Minneapolis in January, to use an extreme example.I love split-units air conditioners, but some are better than others, and for a variety of reasons. My units hold a remarkably steady temperature. When making a decision, investigate your requirements carefully, and purchase units whose cooling and heating capacity are appropriate to the outside temperatures; to the thermal efficiency of your doors, walls and windows; to the cubic volume of each "zone" in your house, the amount of direct sunlight through windows, etc. The *placement* of the (interior) condensers is extremely important! A mediocre, ill-suited condenser that blows cold air right onto you while you're seated or lying in bed can create serious discomfort. There are skilled technicians who can give advice, but ultimately, let the buyer beware when getting down to the nitty-gritty of making decisions. However, overall, split-unit air conditioning units cool rapidly and efficiently. Properly sized and placed units offer tremendous benefits, such as flexibility and energy cost savings between 50% and 60%, which is nothing to sneeze at.

Works great, very happy.. it keeps up with our temperature demands.

The unit does do a good job heating and cooling. The problem I have is that it does not control temperature as set by the remote control. If you have it on cool, it will over shut the set point by as much as 10 degrees and runs all the time. On heating, it over shuts the set temperature by up to 10 degrees. The only way to control temperature is by shutting the unit off and on , when the temperature you want is obtained. This over shutting costs you extra money. I suggest getting a heat pump for more money. I have had the company I bought it from out 3 times without anychange.

Mini splits are not like conventional HVAC systems that use a thermostat. The remote temperature is not a “set point” where it’ll just shut off once it hits it. Mini splits are inverters, think of it this way. Draw a straight line on a piece of paper, then from one side draw big peaks and valleys on either side of that line that get smaller as they travel across the line until they’re just small “bumps” on either side. The straight line is your “comfort setting” those peaks and valleys are the unit trying to get close to the set point. Initially they will be big because the unit has to work to get to the point but as it gets closer you’ll hear the unit ramp down and maybe even see the fan outside slow down. Once you understand how a mini split works, then you can make an informed buying decision. I’ve been in residential HVAC for 20+ years. That’s the best way I can explain that.

Cools and Heats perfectly. I did not experience the same issue as the previous review. Maybe they oversized the mini split capacity.