{"id":4181,"date":"2026-06-18T09:00:00","date_gmt":"2026-06-18T09:00:00","guid":{"rendered":"https:\/\/pirhome.com\/?p=4110"},"modified":"2026-06-18T09:00:00","modified_gmt":"2026-06-18T09:00:00","slug":"case-study-university-dorm-energy","status":"publish","type":"post","link":"http:\/\/www.pirhome.com\/?p=4181","title":{"rendered":"Case Study: University Reduces Dorm Energy by 45% with PIR Sensors"},"content":{"rendered":"<h2>Overview<\/h2>\n<p>A large state university with 10 dormitories (3,000 student rooms) was facing rising energy costs and sustainability goals. Dormitories consumed 8 million kWh annually at a cost of $800,000. Students frequently left lights and electronics on when leaving for class.<\/p>\n<h2>The Challenge<\/h2>\n<p>The university faced several specific issues:<\/p>\n<ul>\n<li>Students left lights on when going to class<\/li>\n<li>Common areas (lounges, laundry rooms) were lit 24\/7<\/li>\n<li>Bathrooms had lights on continuously<\/li>\n<li>HVAC ran regardless of room occupancy<\/li>\n<li>Energy waste contradicted university sustainability goals<\/li>\n<\/ul>\n<h2>The Solution<\/h2>\n<p>The university implemented a comprehensive PIR occupancy system:<\/p>\n<ul>\n<li><strong>Sensors:<\/strong> Leviton OSSMT ceiling-mount (common areas) + Lutron Maestro switches (bathrooms)<\/li>\n<li><strong>Student rooms:<\/strong> Key card + PIR occupancy sensors<\/li>\n<li><strong>Integration:<\/strong> Building management system for HVAC control<\/li>\n<li><strong>Quantity:<\/strong> 3,000 student rooms \u00d7 1 sensor + 500 common area sensors = 3,500 total<\/li>\n<\/ul>\n<p>System logic:<\/p>\n<ul>\n<li><strong>Student rooms:<\/strong> PIR + key card = occupied (HVAC normal). PIR only = unoccupied for 30 minutes (HVAC setback)<\/li>\n<li><strong>Bathrooms:<\/strong> Occupancy sensors with 15-minute hold time for lights, 30 minutes for exhaust fans<\/li>\n<li><strong>Lounges:<\/strong> Occupancy sensors with 30-minute hold time<\/li>\n<li><strong>Laundry rooms:<\/strong> Occupancy sensors with 15-minute hold time<\/li>\n<li><strong>Hallways:<\/strong> Occupancy sensors with 10-minute hold time, dim to 20% when unoccupied<\/li>\n<\/ul>\n<h2>Implementation<\/h2>\n<p>The rollout was completed over one summer break:<\/p>\n<ol>\n<li>Weeks 1-2: Dormitories 1-3 (900 rooms, 150 common areas)<\/li>\n<li>Weeks 3-4: Dormitories 4-6 (900 rooms, 150 common areas)<\/li>\n<li>Weeks 5-6: Dormitories 7-10 (1,200 rooms, 200 common areas)<\/li>\n<li>Week 7: Testing and commissioning<\/li>\n<\/ol>\n<p>Total project cost: $350,000 (sensors, installation, integration). A $100,000 utility rebate reduced net cost to $250,000.<\/p>\n<h2>Results<\/h2>\n<p>After the first full academic year:<\/p>\n<table border=\"1\">\n<thead>\n<th>Area<\/th>\n<th>Before (kWh)<\/th>\n<th>After (kWh)<\/th>\n<th>Reduction<\/th>\n<\/thead>\n<tbody>\n<th>Student rooms<\/th>\n<p> 4,000,000<\/th>\n<p> 2,200,000<\/th>\n<p> 45%<\/th>\n<th>Common areas<\/th>\n<p> 2,000,000<\/th>\n<p> 800,000<\/th>\n<p> 60%<\/th>\n<th>Bathrooms<\/th>\n<p> 1,000,000<\/th>\n<p> 400,000<\/th>\n<p> 60%<\/th>\n<th>Hallways<\/th>\n<p> 1,000,000<\/th>\n<p> 500,000<\/th>\n<p> 50%<\/th>\n<th>Total<\/th>\n<p> 8,000,000<\/th>\n<p> 3,900,000<\/th>\n<p> 51%<\/th>\n<th>Annual cost<\/th>\n<p> $800,000<\/th>\n<p> $390,000<\/th>\n<p> $410,000<\/th>\n<\/tbody>\n<p>\u8868<\/p>\n<p>Additional benefits included:<\/p>\n<ul>\n<li>Reduced CO2 emissions by 2,000 metric tons<\/li>\n<li>Improved sustainability rating (STARS Gold)<\/li>\n<li>Student education on energy conservation<\/li>\n<li>Reduced maintenance calls (burned-out bulbs)<\/li>\n<li>Eligibility for green building certification<\/li>\n<\/ul>\n<h2>Key Lessons Learned<\/h2>\n<ol>\n<li><strong>Key card integration improved accuracy:<\/strong> PIR-only missed students sleeping late.<\/li>\n<li><strong>Bathroom exhaust fan delay prevents mold:<\/strong> 30-minute hold time after motion stopped.<\/li>\n<li><strong>Student communication was essential:<\/strong> Explaining the system reduced complaints.<\/li>\n<li><strong>Hallway dimming saved significant energy:<\/strong> 20% light level while unoccupied saved 80% energy.<\/li>\n<li><strong>Summer installation minimized disruption:<\/strong> No classes during installation.<\/li>\n<\/ol>\n<h2>Conclusion<\/h2>\n<p>This case study demonstrates that PIR occupancy sensors can deliver 45% energy savings in university dormitories. The $410,000 annual savings and 7-month payback period (after rebate) made this a highly successful investment. The key to success was key card integration for student rooms and hallway dimming.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A large state university with 10 dormitories (3,000 student rooms) was facing rising energy costs and sustainability goals. Dormitories consumed 8 million kWh annually at a cost of $800,000. Students frequently left lights and electronics on when leaving for class. The Challenge The university faced several specific issues: Students left lights on when going [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-4181","post","type-post","status-publish","format-standard","hentry","category-case-studies"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Case Study: University Reduces Dorm Energy by 45% with PIR Sensors - PIRHOME<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.pirhome.com\/?p=4181\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Case Study: University Reduces Dorm Energy by 45% with PIR Sensors - PIRHOME\" \/>\r\n<meta property=\"og:description\" content=\"Overview A large state university with 10 dormitories (3,000 student rooms) was facing rising energy costs and sustainability goals. 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