Hemmera is an online retailer offering products for home improvement, renovations, climate control, and everyday living. Its wide-ranging catalogue serves homeowners, DIY enthusiasts, and professional users, with equipment and supplies for indoor and outdoor projects. Climate and comfort products include air-conditioning systems and accessories, heaters, ventilation equipment, fans, humidifiers, and dehumidifiers. The store also stocks appliances for cooking, refrigeration, laundry, cleaning, and home care, alongside specialist catering and hospitality equipment such as commercial refrigeration, dishwashers, ovens, food-preparation machines, and display cabinets.

For gardens and pools, Hemmera offers irrigation and pumping equipment, lawn and garden machinery, outdoor furniture, lighting, barbecues, and pool-maintenance products. Its DIY and building selection covers power and hand tools, electrical supplies, plumbing, heating systems, bathroom fixtures, workshop equipment, and security products. The catalogue further includes televisions, phones, and urban-mobility products such as bicycles and electric scooters. Customers can create accounts, manage shopping lists, compare products, request returns, and track orders through the website.