Micro-Split Cool (MSC) starts by taking the best of both types of air conditionlers ,portable/window units and central air systems. Then we add new features that neither of the traditional types have.

Starting with the basic minimal functional core of a window unit, we convert it into a ductless split system (hot part goes outside and cold part goes inside), like a mini-split system but much smaller and more managable. Also, like a mini-split system, it does not require an HVAC specialist to install it. Neither the outer unit nor the inner unit blocks a window and the inner unit is attractive and extremely quiet.

Beyond that, functional sensors, controls, and displays are added to make the system easy to use, adaptive and controlable.

A single MSC system is optimal for tiny houses and small acessory dwelling units. Such a system can augment a normal or large house existing central air system to perform and save power during todays global warming. For ultimate cost of ownership, several MSC units controlled by a central computer can cool any house no matter the size.

On a very hot summer night in 2022, we took a refrigerator apart down to the core (compressor, hot/cold coils, and copper tubes). After plugging the core in, we were inspired when on this minimal setup, ice started to build up on a cold coil.

For the next year, we acquired many air conditioners, special HVAC tools, refrigerant, and knowledge.

During the summer of 2023, we stripped down a small used window AC to the core and ran it. After determining that it ran and had no leaks, we properly drained the refrigerant, lengthened some of the copper refrigerant lines to separate the hot and cold coils, and put refrigerant back in and tested the system for leaks and functionality. This system is prototype 1.

A week later, we did the same thing to a larger AC. This is prototype 2.