--- title: "Unlocking Efficiency: The Power of Variable Speed Drives in Your HVAC System" description: A Variable Speed Drive (VSD) is a device used to vary the speed, or RPMs of an electric motor. 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[Maximizing Efficiency and Comfort: The Price Ultrasuite for Hospital Operating Rooms](https://info.hoffman-hoffman.com/blog/maximizing-efficiency-and-comfort-the-price-ultrasuite-for-hospital-operating-rooms) - [Dehumidification: Ensuring Optimal Conditions in Critical Environments](https://info.hoffman-hoffman.com/blog/dehumidification-ensuring-optimal-conditions-in-critical-environments) - [Bridging the Gap: Celebrating Sales Engineers During Engineers Week](https://info.hoffman-hoffman.com/blog/bridging-the-gap-celebrating-sales-engineers-during-engineers-week) - [For the Love of HVAC: A Career Story](https://info.hoffman-hoffman.com/blog/for-the-love-of-hvac-a-career-story) - [MERV-A Ratings Make the Best Filters Stand Out from the Crowd](https://info.hoffman-hoffman.com/blog/merv-a-ratings-make-the-best-filters-stand-out-from-the-crowd) #### popular ![](https://info.hoffman-hoffman.com/hubfs/down-arrow.png) - [ABB ACH580 Drives: Override Mode](https://info.hoffman-hoffman.com/blog/abb-ach580-drives-override-mode) - 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[evaporative cooling equipment](https://info.hoffman-hoffman.com/blog/tag/evaporative-cooling-equipment) - [project profile](https://info.hoffman-hoffman.com/blog/tag/project-profile) - [refrigerant](https://info.hoffman-hoffman.com/blog/tag/refrigerant) - [rooftop systems](https://info.hoffman-hoffman.com/blog/tag/rooftop-systems) - [uvdi systems](https://info.hoffman-hoffman.com/blog/tag/uvdi-systems) - [venmar](https://info.hoffman-hoffman.com/blog/tag/venmar) - [ventilators](https://info.hoffman-hoffman.com/blog/tag/ventilators) # Unlocking Efficiency: The Power of Variable Speed Drives in Your HVAC System ![](https://info.hoffman-hoffman.com/hubfs/calender-icon-black.png) April 12, 2023 ![](https://info.hoffman-hoffman.com/hubfs/Untitled%20design%20-%202023-04-12T164706.917.png) A Variable Speed Drive (VSD) is a device used to vary the speed, or RPMs of an electric motor. The most common motor in use today is the AC induction motor. The induction motor converts incoming power into rotating magnetic fields to turn a motor shaft. This shaft is connected to a driven load either directly or via belts and pulleys or a reducing gearbox. In the HVAC world, the driven load is often a fan or a pump. Modern HVAC systems use Variable Speed Drives to control the flow of air and liquids in a system sized for the hottest (or coldest) day of the year. Rather than utilizing complex mechanical methods to throttle air or water in off-peak times, a Variable Speed drive allows you to simply slow down the electric motor driving the fan or pump. This creates a more controllable and reliable HVAC system resulting in a comfortable and happy customer, and the system operates at its peak performance point. In HVAC applications, fans and pumps are mostly variable torque loads. This means the power required to turn the fan or pump decreases dramatically when slowed down. This phenomenon is described by the Affinity Laws for fans and pumps. For example, a fan running at half-speed (30Hz), may require as little as 15-20% of the power required to run at full speed (60Hz). This gives the building owner a tremendous opportunity for savings over the 13-15 year lifespan of the VSD. There are additional advantages to using Variable Speed Drives. For example, ramping a motor up and down reduces maintenance costs and improves reliability by lowering inrush currents, providing longer belt life, and reducing hydraulic shock. In addition, many Variable Speed Drives can communicate with Building Automation Systems, interlock with safety devices such as High Static switches, and control flow via integrated PID logic even with multiple pumps. ABB's wide portfolio of low and medium voltage AC drives are the key to helping you reduce your energy use, maintenance costs, and CO2 emissions. ##### // about the author ![Perry Conte](https://info.hoffman-hoffman.com/hubfs/MicrosoftTeams-image%20(28).png) ### ![](https://info.hoffman-hoffman.com/hubfs/user.png) [Perry Conte](https://info.hoffman-hoffman.com/blog/author/perry-conte) Perry is the Senior AC Drive Specialist at Hoffman & Hoffman. ##### // share this post - - - - [mailto:?body=https://info.hoffman-hoffman.com/blog/unlocking-efficiency-the-power-of-variable-speed-drives-in-your-hvac-system](mailto:?body=https://info.hoffman-hoffman.com/blog/unlocking-efficiency-the-power-of-variable-speed-drives-in-your-hvac-system) - ### Recent Posts ### categories - [ABB (6)](https://info.hoffman-hoffman.com/blog/tag/abb) - [AHU (1)](https://info.hoffman-hoffman.com/blog/tag/ahu) - [air circulation (9)](https://info.hoffman-hoffman.com/blog/tag/air-circulation) - [air handler (5)](https://info.hoffman-hoffman.com/blog/tag/air-handler) - [air pollution (4)](https://info.hoffman-hoffman.com/blog/tag/air-pollution) - [Air Purification (5)](https://info.hoffman-hoffman.com/blog/tag/air-purification) - [air quality (8)](https://info.hoffman-hoffman.com/blog/tag/air-quality) - [airborne illnesses (3)](https://info.hoffman-hoffman.com/blog/tag/airborne-illnesses) - [Architectural Design (1)](https://info.hoffman-hoffman.com/blog/tag/architectural-design) - [Architectural Solutions (1)](https://info.hoffman-hoffman.com/blog/tag/architectural-solutions) - [ASHRAE (8)](https://info.hoffman-hoffman.com/blog/tag/ashrae) - [Automatic Balancing Dampers (1)](https://info.hoffman-hoffman.com/blog/tag/automatic-balancing-dampers) - [Baldor Motors (1)](https://info.hoffman-hoffman.com/blog/tag/baldor-motors) - [Big Ass Fans (5)](https://info.hoffman-hoffman.com/blog/tag/big-ass-fans) - [Building (6)](https://info.hoffman-hoffman.com/blog/tag/building) ### subscribe #### Our Location Main Office 3816 Patterson St Greensboro, NC 27407 #### Hours of Operation 8AM to 5PM – Monday through Friday Closed Saturday and Sunday *We offer 24/7 emergency repair service* #### Contact Us ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Main Office [(336) 292-8777](tel:+3362928777) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Stock Warehouse [(800) 334-0254](tel:+8003340254) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Replacement Parts [(800) 332-2295](tel:+8003322295) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/email-white.svg) Consultation / Evaluation: [info@hoffman-hoffman.com](mailto:info@hoffman-hoffman.com) Hoffman & Hoffman, Inc., Hoffman Building Technologies, Inc., Hoffman Mechanical Solutions, Inc., and Heat Transfer Sales, LLC, are separate legal entities. ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/footer-logo.png) All content © 2019, Hoffman & Hoffman [![Facebook](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/facebook-white.svg)](https://www.facebook.com/HoffmanHoffmanInc) [![Instagram](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/instagram-white.svg)](https://www.instagram.com/hoffmanhoffmaninc/) [![Twitter](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/twitter-white.svg)](https://twitter.com/HoffandHoffInc) [![LinkedIn](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/linkedin-white.svg)](https://www.linkedin.com/company/hoffman-%26-hoffman-inc./) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Perry Conte", "url" : "https://info.hoffman-hoffman.com/blog/author/perry-conte" }, "dateModified" : "2023-04-12T20:47:01.864Z", "datePublished" : "2023-04-12T20:47:01.000Z", "headline" : "Unlocking Efficiency: The Power of Variable Speed Drives in Your HVAC System", "image" : [ "https://info.hoffman-hoffman.com/hubfs/Untitled%20design%20-%202023-04-12T164706.917.png" ], "mainEntityOfPage" : { "@id" : "https://info.hoffman-hoffman.com/blog/unlocking-efficiency-the-power-of-variable-speed-drives-in-your-hvac-system", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://info.hoffman-hoffman.com/hubfs/HH_Logo_RGB.png" }, "name" : "Hoffman & Hoffman, Inc." } } ```