Welcome To ComfortStar! Sign In or Create an Account

Ductless Systems

Ductless Split Systems

Advances in inverter technology have made mini-split heat pump systems among the most high efficiency heating and air conditioning systems available in the market. This technology allows us to modulate the frequency of a compressor according to the thermal load of the conditioned space; therefore, a compressor can reduce the amount of work it does to reach a desired set temperature. This results in longer compressor life-span and most importantly, decrease in energy usage and increased energy savings. Mini-splits are ideal when making additions to a home, since expanding existing duct work can be problematic in some situations. Ease of installation makes it very practical for light commercial applications, such as hotel rooms, office spaces, malls and hospitals.

Ductless Split Systems


  • No Duct Work Required: Helps to save space, eliminates heat loss and easier installation.
  • Zone Control: Maximize energy efficiency by individually cooling or heating only those spaces desired.
  • Inverter, no compressor/motor hard starts: Increases efficiency, and extends the life of mechanical components. Thermal loads are reached quickly and sustained using minimal energy consumption.
  • Flexibility - suitable for residential and light commercial application.
  • Very quiet – low decibel levels for indoor/outdoor units.

Systems are available for single zone and multi-zone applications:

Single Zone Units

Perfect for achieving true-zoning in applications where thermal loads may vary within the same building/residence. Indoor high-wall evaporator units are available from 9,000 BTU to 24,000 BTU. 

Multi-Zone Systems

A single outdoor condensing unit can power up to 4 different indoor evaportaors. There are more than 96 possible combinations ranging from 9,000 BTU to 24,000 BTU in high-wall mounts and light commercial units which make it very flexible for contractors in designing the system. 

Ductless Split Systems, similar to central cooling systems, are categorized as air conditioning (cooling only) and heat pump systems which provide heating and cooling.

A single-zone system includes a condensing unit (outdoor) and an evaporator unit (indoor); which is what will supply the conditioned air. Inverter mini-splits use electricity to pump refrigerant through copper piping and transfer heat from one space to another through a condenser using a compressor.

Heat pump systems make it possible for a condensing unit to switch from producing cooling or heating through the use of a reversing valve, or 4-way valve. This valve reverses the flow of refrigerant through the compressor to provide comfort cooling or heating depending on the preference of the end user.

Mini-split systems are favored in residential applications where duct work from a central a/c system is not available. This typically occurs when renovating or making an addition to a home. In most cases, expanding on existing duct work can be difficult and very expensive. Ductless mini-split systems allow for ease of design and installation, making it a promising alternative to central systems for almost any HVAC application.

Mini-splits are perfect for older buildings with no space for duct work, existing building with hot or cold areas caused by uneven air distribution, residential additions, schools, churches, server rooms and even restaurants!

Residential Ductless Split Systems

  • Sun Room
  • Garage
  • Pool House
  • Server Rooms
  • Home Theatre Room
  • Home Gym
  • Or any addition to a home where central duct work is not available…


Commercial Ductless Split Systems

  • Malls
  • Office Spaces
  • Gym
  • Hospitals
  • Hotels
  • Shopping Plazas
  • Sporting Facilities
  • Warehouses


Ductless Split Systems Installation

The steps are very similar to a conventional a/c or heat pump system, where the main difference is the interconnecting wiring between the indoor unit and outdoor unit.

In general, installation is as follows:

  1. Mount indoor and outdoor units.
  2. Connect the refrigeration lines. Insulate both gas and liquid lines.
  3. Connect power supply wire to condenser.
  4. Connect interconnecting wire from condenser to evaporator.
  5. Power up the system.


Inverter systems work with standard AC power supply. This voltage however goes through a series of circuit boards that convert ac voltage to dc voltage. then inverting it back to a simulated three-phase ac voltage to drive the compressor. A series of controls attached to the main baords send different commands in order for the system to fully operate simultameously. The inverter compressor runs depending on the thermal load demand required indoors. 

Inverter technology is the capability of various electronic components to regulate the inverter compressor at different speeds (frequencies). Using a simulated 3-phase power to drive the compressor, the system achieves set temperature in a short time and maintains it. The Inverter is the combination of an Inverter rotary compressor and an intelligent compressor controller. 

  • Eliminate compressor hard starts which is the main cause of high power consumption. 
  • Reach set temperature quicker compared to conventional systems. 
  • Maintain steady room temperature for better comfort. 
  • Quiet operation. 
  • High efficiency systems. 
  • Built-in low ambient kit for Heating and Cooling operation when the outdoor ambient temperature decreases to 5°F. 
  • Self-diagnostics LED's on the outdoor unit main board and intelligent error codes displayed on indoor unit digital display for easy servicing & troubleshooting.