From furnace installation to water purification — CASI's bonded technicians deliver 100% guaranteed work, every time. Serving London and area for over 7 years.
We'll get back to you within a few hours.
No spam. We'll call you back directly.
HVAC, air quality, and water solutions under one roof. Every job inspected by a senior manager within two weeks of completion.
New furnace installations and repairs by bonded technicians. From sales to install, every step is handled with care and backed by our 100% guarantee.
Air conditioner installation and repair for homes across London and area. Stay comfortable year-round with equipment and service you can count on.
Professional duct and vent cleaning that actually gets the job done. Our team keeps debris contained and leaves your home cleaner than they found it.
UV filters, air purifiers, and ventilation solutions. Cleaner air for your family — installed and explained so you know exactly what you're getting.
Water softener installation, filtration systems, and water quality testing. Troy tests your water parameters and recommends the right solution for your home.
Professional testing for mold, air quality, and water quality. Know what's in your home so you can take the right steps to protect your family.
CASI Air & WaterCASI was built on one core value: 100% customer satisfaction. Every product and every service is guaranteed — and every job, from a duct clean to a full furnace and AC install, is inspected by a senior manager within two weeks of completion.
Our bonded technicians are knowledgeable, honest, and take the time to explain what they're doing and why. Most of our customers have been with us for years — and that's the way we like it.
Real reviews from real customers in London and area.
"I have used CASI for more than 7 years. The company has always been professional, the installers well-trained and the service friendly. I recommend them 100%."
"The CASI team was on time, respectful of my clean space, and allowed me to watch the whole process. Finally an HVAC company that is good quality, reliable, trustworthy and at an amazing price!"
"Troy was amazing! Very professional and friendly. Explained everything about our water softener system, tested the water, and gave us a couple of alternatives. Would definitely recommend."
Based in London at 600 Third Street, serving homeowners and businesses across the region.