Local HVAC done right — by people who answer the phone and stand behind the work.

Your furnace doesn't care about sales pitches — and neither do we.

Cassar Heating & Air Conditioning has been keeping Durham Region homes comfortable since 2011. Founded and led by David Cassar, our small team handles every job the same way — show up on time, fix it right, and leave the place cleaner than we found it.

Call (416) 508-4585 Our Services

David Cassar — owner, Cassar Heating & Air Conditioning, Durham Region

✓ TSSA Licence #000398183 ✓ Owner-operated since 2011 ✓ 20+ years HVAC experience ✓ Small team, consistent quality ✓ All of Durham Region ✓ Every job left cleaner than we found it

About Cassar Heating & Air Conditioning

Cassar Heating & Air Conditioning has been serving Durham Region homeowners since 2011. Founded by David Cassar — TSSA Licence #000398183, 20+ years in the trade — the company runs on a simple standard: every technician who steps into your home treats it the way we'd want our own treated.

We're a small, owner-led team. That means no mystery techs, no revolving door of subcontractors, and no one on our crew who hasn't earned their spot. When you call Cassar, you get someone who knows the work, stands behind it, and isn't in a rush to sell you something you don't need.

The work covers the full range of residential HVAC: furnace installations and repairs, central air conditioning, ductless mini-splits, heat pumps, and light commercial jobs that most residential contractors won't take on. Condo installs no one else will touch. Older homes with unusual duct layouts. We've seen it all and haven't walked away from a job yet.

The clean-up is part of the job — not an afterthought. Boots get covered. Drop cloths go down. Every job site is left the way we found it, or better.

How every Cassar job works

Transparent quote before any work starts — no surprises on the invoice
Drop cloths down, boots covered — your floors stay clean
Most jobs completed in a single visit
No garbage left behind — all old equipment hauled away
No upsell pressure — we recommend what the system actually needs
Repairs, full installs, and light commercial — one call covers it all
Consistent crew — you'll recognise the faces on return visits
Honest advice even when the answer is "you don't need to replace it yet"

What Durham Region homeowners say

⭐ See all reviews on Google

Ready to book, or just have a question?

Call us directly — no hold music, no call centre, no callback window.

(416) 508-4585