Contact Numbers

0861 502 023

087 351 8351



Physical Address

1 Club Street, Linksfield, Johannesburg, South Africa




Design Envelope technology is at the core of Armstrong's groundbreaking activities of 'Making Energy Make Sense'. Design Envelope technology enables the greenest, most flexible and most cost effective fluid-flow and HVAC systems on the planet - resulting in both, lowest installed and lowest operating cost with the same equipment.


Design Envelope technology replaces mechanical components with electronics and software intelligence in order to downsize equipment and optimize part-load performance. Most fluid-flow and HVAC systems in buildings operate at less than 60 percent 95 percent of the time - with less than 2 percent of operating time spent in full-load mode!

By exploiting this truth Armstrong Design Envelope technology frequently has boosted fluid-flow and HVAC performance by 50% or more compared to conventional technology and operating principles – in many instances right from the get go! On a building performance level this translates into substantial improvements in Afford-ability, Flex-ability, Sustain-ability, and Live-ability - the four key benefit areas of Design Envelope technology.

Since first deployed in Armstrong key products in 2007, Armstrong Design Envelope technology has led to impressive performance improvements across hundreds of installations around the world. Related savings in energy, cost and carbon emissions are documented on Armstrong's Energy Savings Dashboard. The Armstrong Energy Savings Dashboard is continuously updated based on actual Design Envelope product shipments as well as our documented before-and-after performance evaluation process.


Need to provide a comfortable & responsive indoor environment for your tenants and customers?

Design Envelope technology leverages demand-based control to its fullest providing exactly the heating or cooling load required at any given time.

Your living, office, or commercial space is optimally conditioned regardless of current usage, weather, and building or site design modifications.


Need to prepare yourself against shifting or unpredictable project conditions?

Design Envelope technology combines the largest high efficiency operating range and demand-based control in every application. This safeguards your HVAC design, installation or system against changes in specification, site conditions, and building usage - now and into the future.

You avoid the risk of last minute and costly redesigns, onsite modifications, or system underperformance. Design Envelope technology is ahead of the next generation of environmental and energy-efficiency programs and regulations.


Need to achieve ambitious environmental performance goals to comply with regulations, avoid cost or penalties, and care for our planet and climate?

Design Envelope technology spares materials at the installation and maintenance levels, but most importantly, it saves millions of kWhs of electricity over its operating life.

This prevents hundreds of thousands of tonnes of greenhouse gases (CO2) from being released into the atmosphere. For the full story in numbers please visit Armstrong's Energy Savings Dashboard.


Need to plan and deliver an HVAC project at the lowest possible cost at commissioning?

Due to its world-leading space and pipe-saving designs combined with the latest capabilities in product selection, plug-and-play installation and software-supported commissioning, Design Envelope technology saves you plenty of time and cost.

You'll come in at the lowest installed cost possible compared to any other approach available today.


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For any questions regarding our products and solutions, please contact Cale Pumping Solutions on 0861 502 023 or info@calepumps.com