CASI provides HVAC installation, service and repair to residents of London and the surrounding area. From a new furnace to AC repair, the bonded technicians at CASI can help. 100% customer satisfaction is the core value here at CASI. All products AND services are guaranteed. EVERY job, from a duct clean to a furnace & A/C install are inspected by a senior manager within 2 weeks of completion ensuring customer satisfaction. Product or service: furnace repair, new furnace installation, AC repair, AC installation, air filtration, water filtration. Business Hours: Mon-Thu: 8:00am-8:00pm; Fri: 8:00am-6:00pm; Sat: 9:00am-5:00pm