Benefits in HVAC Units

  • Better power supply quality, system diagnostics, humidity control, energy savings, accurate temperature control, less noise, process safety, greater comfort.

    Inverter compressor technology offers new opportunities for air conditioning systems, first of all in terms of energy efficient buildings, reduced energy consumption and lower running costs. 

    Additionally, the technology improves power factor leading to better power supply quality as well as better system diagnostics and open communication protocols which facilitate servicing. 

    Continuous adaptation to cooling demand provides higher energy savings and accurate temperature control.

    The compressor matches power input with cooling capacity. The unit copes effectively with changes in temperature and runs at partial load which can represent over 30% reduction in the energy bill every year compared to a fixed speed or mechanically modulated compressor. The stable temperature control secures the processes in an optimum way and provides greater comfort. All in all, this means energy efficiency in buildings.

    The capacity modulation attenuates power demand peaks which also contribute to increasing the grid reliability and quality of power supplied.

    The soft start control leads to a near zero inrush current and improves EER:

    • Direct-on-line (DOL) compressor start draws 5-6 times the nominal current until the compressor running speed is attained. Traditional fixed-speed compressor in a system can make 8-12 start/stop cycles and every start will draw high current from the supply, which leads to high power consumption and stress on supply, and on compressor mechanical parts.
    • Most inverter scroll compressors are soft starting which avoid torque surges. It prevents high mechanical stress on the machine, and generates lower service costs and decreased wear. Low in-rush current also helps in saving fixed costs charged by utilities (peak current calculation) and reduces mains and power backup loads.

    Additional benefits are of inverter compressors are:

    • Better humidity control makes the unit suitable even for spa installations thanks to adjust the capacity of the unit and thus better control of the evaporating temperature.
    • Less noise than with conventional on-off systems during partial load operation.

    On top of the standard benefits for all inverter compressors and technology, Danfoss Commercial Compressors has prequalified inverter compressors and drives designed to work together.

    This adds to the long list of benefits to manufacturers, consulting engineers and end-users in terms of:

    • Reduced number of components in the system
    • Higher reliability and continuous running
    • Easier to implement technology
    • Reduced applied costs
    • Faster time to market.


  • Comparison of Energy Consumption by Compressor Technology
  • HVAC Operation at Full Load
  • Temperature Control with Danfoss Inverter Technology
  • Energy consumption for cooling systems using different compressor configurations. Average consumption index based on simulations for 10-30TR compressors used in applications with low pressure ratio (rooftop); Index 100 = Danfoss inverter scroll VZH energy consumption.


  • Typical load profile in a building

    Only a few percentages of operations are at full load in a building. HVAC systems are designed for peak conditions (right side of the graph). These conditions are not those conditions in which the equipment will operate most of the time. This graph represents typical annual climate data and hours of run time (% of year) for each condition.

    Source: Danfoss HVAC tool


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