Ductwork Services · Design · Installation · Sealing & Repair
Ductwork Design, Installation & Repair — GTA & Durham
Proper ductwork is the foundation of HVAC performance. Leaky, undersized, or poorly designed ducts can waste 20–30% of your heating and cooling energy — even with a high-efficiency system. We design, install, seal, and repair ductwork to get your system performing as it should.
✓ TSSA Certified
✓ Authorized Lennox Dealer
✓ Authorized Rinnai Dealer
✓ Since 1995
Ductwork That Delivers — Design, Installation & Repair
Most HVAC problems we diagnose — uneven temperatures, poor airflow, high energy bills, equipment short-cycling — trace back to a duct system that was never properly designed or has deteriorated over time. A high-efficiency furnace paired with leaky or undersized ducts performs no better than a basic unit installed correctly. Ductwork is where HVAC performance is won or lost.
Services We Provide
- Duct design & sizing — Manual D duct design ensures every room receives the correct airflow for the installed equipment and home layout.
- Duct installation — New ductwork for additions, renovations, new construction, or complete replacement of deteriorated systems.
- Duct sealing — Mastic sealant or foil tape at joints, connections, and plenums — the most cost-effective duct improvement for most homes.
- Duct repair — Disconnected branches, crushed flex duct, collapsed liner, and failed joints — repaired to restore correct airflow.
- Air balancing — Adjusting dampers and register positions to equalize airflow across all zones and rooms.
Our Process
Duct assessment
We inspect accessible ductwork, measure airflow at key registers, and identify leakage points and undersized sections.
Design or repair plan
For new installations: Manual D design. For repairs: documented repair scope with before/after airflow targets.
Installation or repair
Correct sheet metal sizing, sealed joints, and proper support throughout.
Air balancing
Post-installation balancing to verify correct airflow to every room.
Pricing & Financing
Duct sealing: $500–$1,500 depending on access and extent. Partial duct replacement: $1,000–$4,000. Complete new duct system: $4,000–$12,000+. Free assessment for all ductwork projects.
Why Choose Malek
Expert Ductwork Service You Can Trust
Manual D Design
We design ductwork systems using Manual D — the engineering standard for residential duct sizing. Not guessing on duct size.
New Construction Capable
We work with builders and homeowners on complete new construction HVAC and ductwork packages.
Sealing Specialists
Mastic sealant and proper foil tape application at every joint — the only way to achieve a durable, airtight seal.
Post-Installation Balance
We measure airflow at every register after installation to confirm the system is performing as designed.
Related Services
Everything Under One Roof
Common Questions
Frequently Asked Questions
How do I know if my ductwork is causing problems?
Warning signs: uneven temperatures between rooms, weak airflow from some vents, high energy bills despite newer equipment, system short-cycling, or dusty rooms. A duct assessment identifies whether leakage, undersizing, or improper design is the root cause.
How much does duct sealing cost?
$500–$1,500 for a typical residential duct sealing project, depending on system access and extent of leakage. Duct sealing typically produces the fastest payback of any HVAC investment when duct leakage is the identified problem.
Can you add ductwork for an addition or renovation?
Yes. We design and install new duct branches for additions, finished basements, and renovations — ensuring new areas receive correct airflow without overloading the existing duct system.
Do you do new construction HVAC and ductwork?
Yes. We work with builders and homeowners on complete new construction HVAC packages including Manual J load calculation, equipment selection, Manual D duct design, and full installation.
Is Your Ductwork Costing You Money?
Free ductwork assessment — we identify leakage, undersizing, and airflow problems and give you a clear repair or replacement plan.
Or call 416-881-2720 — Mon–Fri 8am–6pm, Sat 9am–4pm
Get Your Free Estimate!
No pressure, no obligation. We respond same day.