Energy Savings from Retrofitting Air-Conditioners

This cloud-based retrofi t system utilizes unused thermal energy from existing air-conditioning systems to cut energy use for heating and cooling water by up to 70%

Hot water in many commercial facilities is normally supplied via central boilers powered by fossil fuels, while air cooling is supplied by electric chillers. By using a self-contained water heat pump, Phoebus Energy takes unused thermal energy from existing air-conditioning systems and transfers it to the boilers’ circuit. This new and effi cient thermal energy can then be used in showers, pools, and kitchens in large commercial sites, like hotels, hospitals, sports centers, and nursing homes.

The retrofit solution works with existing heating and cooling systems and saves 50% to 70% on heating and cooling expenses, according to the company. The system intelligently optimizes energy consumption based on cloud software, which collects real-time data every 60 seconds. The data is processed in a cloud-based control system that determines how to produce the required heat and cooling energy at the lowest possible cost by reducing the operating time of the more expensive and polluting boilers.

Relevance of solution

In 2010, buildings accounted for 32% of total global energy use and 19% of energy-related greenhouse gas emissions.1 Phoebus Energy is helping to lower energy use in commercial facilities worldwide by utilizing the excess thermal energy from air-conditioning systems to heat and cool water.

Triple Bottom Line


The technology has so far reduced CO2 emissions by more than 11,000 tons, according to Phoebus Energy.


By implementing the solution, customers can monitor real-time and historical data to stay up to date on their energy and water consumption and savings.


Phoebus Energy has a short return-on investment period and has saved many facilities more than 50% on their heating costs, according to the company’s internal case studies.


  1. IPCC Fifth Assessment Report.“Climate Change 2014: Mitigation of Climate Change.” (2014.)