CASI Air & Water is a fully licensed and professional HVAC and air/water purification company. Based out of London, Ontario, CASI serves clients from Windsor to Ottawa and everything in between. 

CASI offers services from furnaces, air conditioning systems, purification for air and water, full maintenance and protection packages, to the duct and furnace cleaning. Our licensed gas fitters insure a perfect job with every customer, not only with our furnace and duct divisions but also with our water and air division.

With our competitive pricing, top of the line products, impeccable customer service, and incredible protection plans, it’s no wonder that CASI is the number one HVAC and water purification company in South-Western Ontario. Please take a look at our online product line, and feel free to call our office for a free quote on a furnace, A/C, duct cleaners, air purifiers, water conditioners and softeners, or reverse osmosis water purifiers