Our History

We have over 70 years experience within the HVAC industry and work on medium to large scale projects, ranging between R 5 million and R 500 million in value.

Our 250 staff members across our branches in Johannesburg, Western Cape, Kwa-Zulu Natal, as well as Mozambique , enable us to service South Africa and Sub Saharan Africa; while our in-house manufacturing facilities allow us to manufacture key HVAC components at competitive prices and shorter lead times.


Thermaire head office in 1945


Thermaire Investments head office today

Operational since 1945

Improvair Environmental Solutions (IES) is a division of French company ENGIE, and one of the oldest air conditioning companies in South Africa. The company was started in 1945 by Mr. Robert J. S. Caldwell who began providing hospital ships for the British Admiralty in the Port Elizabeth harbour with air conditioning.

Since then the company has been through a number of name and ownership changes and all assets and liabilities were bought from Murray & Roberts in 2005. In 2018, ENGIE bought a 100% shares of the Thermaire Investments Group, which included IES.

IES Today

As a global energy company and expert operator in Renewables and Energy Storage, Lighting, Heating and Cooling Systems, and Energy Management and Controls, ENGIE acquired IES in line with its acquisition strategy to grow its presence in the African market.

Furthermore ENGIE acquired 100% shareholding of South African company Ampair  who are specialists in planned preventative maintenance and breakdown and repair of HVAC plants.

Together, Ampair and IES are able to provide turnkey HVAC solutions to customers across the Middle East and Africa. The company has also expanded its portfolio to provide turnkey Mechanical, Electrical and Plumbing (MEP) solutions for large projects across these regions.



   Click The Picture To  Meet The Executive Management Team


We are one of the largest HVAC companies in South Africa and continue to be at the forefront of air conditioning technology. Our extensive client list includes: MTN, Unilever, Standard Bank, Investec, Airports Company of South Africa (ACSA), Atterbury Property, Medupi Power Station, Eskom, Kusile Power Station, Redefine properties, and many more.At IES, we continuously strive to meet and surpass our customers’ expectations. We also pride ourselves on excellent workmanship, supplying only quality equipment to meet specifications.

In the Gauteng region IES is ISO 9001:2008 certified and also graded by the Construction Industry Development Board (CIDB) at a level 7ME. We are a level 5 BBBEE contributor and continue to strive for a level 1 grading.


All our awarded contracts are run according to the following primary objectives:

  • Understanding the customers’ requirements
  • Excellent value for money
  • Professional project management
  • Well-engineered designs
  • High quality installations
  • Innovative solutions for all air treatment needs and requirements


At IES we take pride in providing superior installations.

IES Quality Policy


Our Quality Policy is based on a Quality Management System that follows the strict requirements as specified by the ISO 9001:2008 certification guidelines. This system ensures that each of our products and services are managed, controlled and assured according to the highest global standards.

Constant monitoring of quality and installation procedures are carried out in accordance with stringent industry quality standards and client requirements. All of our contract and specialist sub -contractors are trained and well versed in providing quality installations.


An extensive record of successfully completed contracts and satisfied clients provides assurance that all services offered by IES meet with national as well as international standards.


Our Quality Policy Statement:

  • We are a customer focused organisation
  • We strive to exceed all stakeholders’ requirements
  • We strive to continually improve the effectiveness of the Quality Management System
  • We are open to employee and customer suggestions
  • Health and safety regulations are adhered to

Our Quality Objectives:

  • Reduce Customer Complaints
  • Improve Customer Satisfaction
  • Improve “On Time Delivery”






IES Vision, Mission and Values

Our vision is to be the leading total solutions provider in the HVAC industry.

We strive to do it right the first time, every time and with zero defects. We hold ourselves accountable to our customers, shareholders, partners, suppliers and employees by honouring our commitments, providing results and striving for the highest quality.

Valuing employees and encouraging talent.
Our employees are our company’s greatest asset. We provide a satisfying and challenging environment where talented people can excel and where they have freedom to develop their ideas.

Together, we succeed.
Our clients’ businesses deserve our total and absolute commitment. Our goals are mutual. Together we forge win-win relationships to achieve joint success.