Insulation supply,
done right.
Our Story
Therma Source is a family-owned insulation supplier based in Winchester, Ontario, started in 2026.
We stock a variety of insulation types in our local warehouse — no middlemen, no big-box markups — which is how we keep prices low.
We know insulation, and whether you're a contractor spec'ing a foundation or a homeowner insulating your first basement, we'll help you get the right product for the job
Honest tax-in pricing, quality products, and people who pick up the phone when you need us. Compare us to the market — you'll be glad you found us.
GREAT PRICES
Competitive tax-in pricing on insulation. What you see is what you pay.
FAST DELIVERY
Need it today? We got you. Often deliver same-day, anywhere in Ontario. Reach out to arrange delivery.
LARGE INVENTORY
Big order? No problem. Our warehouse is stocked and ready to go, along with our delivery trucks and drivers.
FAMILY VALUES
Therma Source is family-owned and operated. We try to operate the business with family values, such as honesty and fairness.
Karim Itum (P.Eng)
Licensed Professional Engineer
Brings the structural and thermal engineering knowledge to make sure you're specifying the right product for your application.
Faris Itum (M.Arch)
Master's degree in architecture
Whether you're insulating a basement, building out a wall assembly, or working to a tight budget — Faris helps you navigate the options and find what actually fits your project.
The People Behind Your Order
Between us, we bring the technical depth to give you straight, professional advice — We provide practical product-selection and quantity guidance.
A family business built on fair prices, large inventory, and honest technical advice.
Prices that speak for themselves
We do our best to offer the lowest prices. Compare us against the market — we're confident you'll see the difference. All prices are tax-inclusive, so the number you see is the number you pay. Orders over $1,000 receive an automatic 5% discount.
Large inventory, ready
We carry deep stock so bulk orders go out without delay. Often, our insulation is delivered on the same day an order is placed!
Delivery across the region
We deliver to your job site or home, anywhere in Ontario. Contact us for a quote — delivery pricing depends on location and order size. But even with it factored into the order total, you save big when you buy from us.