Furnace Installation & Replacement in Toronto & the GTA

Direct Air Systems is an authorized Lennox Premier Dealer installing high-efficiency gas furnaces across Toronto, Markham, Bolton, Vaughan, Brampton, Mississauga, Richmond Hill and Newmarket. Our TSSA-licensed technicians handle the full scope — Manual J sizing, permit, installation, commissioning, and warranty registration — so your new furnace is right-sized, code-compliant, and covered from day one.

Why Replace Your Furnace with Direct Air Systems?

• Authorized Lennox Premier Dealer — factory-trained technicians, full manufacturer warranty support, and access to the complete Lennox furnace lineup.
• Proper Manual J load calculation — we size your furnace correctly. An oversized furnace short-cycles and wastes gas; an undersized one can’t keep up on the coldest GTA nights.
• TSSA permit and inspection included — Ontario law requires a permit for every gas furnace installation. We handle the application and inspection on your behalf.
• Same-day and next-day availability — emergency furnace failures don’t wait. We maintain local stock of the most common Lennox models for urgent replacements.
• Warranty registration on day one — Lennox requires registration within 60 days for the full 10-year parts warranty. We register every installation we complete.

Lennox Furnace Lines Available in the GTA

Lennox Merit Series — ML196E (96% AFUE)

Entry-level high-efficiency gas furnace. Single or two-stage heat, constant-torque PSC blower, available 30,000–120,000 BTU. Meets Ontario’s minimum 95% AFUE standard. ENERGY STAR certified. Recommended for budget-conscious replacements, rental properties, and smaller GTA homes under 1,500 sq ft.

Lennox Elite Series — EL296E & EL297V (96–97% AFUE)

The most popular Lennox furnace line for GTA detached and semi-detached homes. The EL296E runs at 96% AFUE with two-stage heat and a constant-torque blower. The EL297V upgrades to a variable-speed ECM blower at 97% AFUE — quieter, more even heat distribution, and lower operating cost. Available 44,000–132,000 BTU. Our most-recommended model for homes 1,500–2,500 sq ft.

Lennox Signature Collection — SLP99V (Up to 99% AFUE)

The highest-efficiency Lennox furnace available in Canada. Fully modulating gas valve adjusts burner output in 1% increments. Variable-speed ECM blower runs near-silently at partial load. Compatible with Lennox iComfort S30 smart thermostat for zoning and remote monitoring. 10-year parts warranty + lifetime heat exchanger warranty when registered. Recommended for homes over 2,000 sq ft where comfort, quiet operation, and long-term efficiency are the priorities.

What’s Included in Our Furnace Installation Service

• Free in-home assessment — Manual J heat-loss calculation, ductwork inspection, rebate eligibility review, and written installed quote.
• Equipment sizing and selection — we match BTU output to your home’s specific heating load, not a rule of thumb.
• Safe removal and disposal — old furnace disconnected, removed, and disposed of responsibly.
• Gas and venting connections — PVC sidewall venting, gas line connection, and condensate drain to Ontario code.
• Start-up and safety testing — gas pressure verification, combustion analysis, CO testing at supply registers, airflow verification.
• Warranty registration and homeowner walkthrough — filter maintenance demo, annual maintenance schedule, and Lennox warranty registration on the same day.

When to Replace vs. Repair Your Furnace

Not every heating issue requires a new furnace. If your system is under 12 years old with a single fault, targeted repair often makes more sense. If it’s over 15 years old, has had multiple repairs, or has a cracked heat exchanger, replacement is usually the better investment. See our furnace repair vs. replacement guide for a detailed breakdown of when each option is appropriate.

Common signs it’s time to replace:

• Furnace is 15+ years old with rising energy bills
• Repeated repairs in the past two heating seasons
• Cracked heat exchanger (immediate replacement required — CO risk)
• Uneven heating or persistent cold rooms despite duct cleaning
• AFUE below 80% — upgrading to 96%+ will meaningfully reduce gas bills

Pair Your New Furnace with a Lennox Heat Pump

Many GTA homeowners now pair a new Lennox furnace with a Lennox cold-climate heat pump in a dual-fuel hybrid system. The heat pump handles heating efficiently during shoulder seasons (above −10°C) while the furnace takes over on the coldest days. This combination delivers the best year-round energy efficiency for GTA homes and may qualify for available Ontario rebate programs.

Frequently Asked Questions

What size furnace do I need for my GTA home?

Most GTA homes need between 60,000 and 100,000 BTU depending on square footage, ceiling height, insulation, and window area. A 1,200 sq ft bungalow typically needs 60,000 BTU; a 2,500 sq ft two-storey may need 80,000–100,000 BTU. We perform a full Manual J heat-loss calculation on every assessment — never a rule-of-thumb guess.

How long does a furnace installation take in Toronto?

A standard furnace replacement in a GTA home takes 6–10 hours with two technicians — most jobs are complete in one working day. Installations requiring new gas line work, chimney liner changes, or significant ductwork modification can extend to 1.5 days. We confirm the timeline at your free in-home assessment.

Do I need a permit for a new furnace in Ontario?

Yes. Ontario requires a TSSA permit for every gas furnace installation. TSSA-registered contractors must perform the work and the installation must pass a post-installation inspection. Direct Air Systems handles the permit application and inspection on every job.

Is a variable-speed furnace worth the extra cost?

For most GTA homes over 1,500 sq ft, yes. A variable-speed ECM blower (EL297V, SLP99V) runs significantly quieter than a constant-speed motor, distributes heat more evenly, and costs less to run over the furnace’s 15–20 year life. The incremental cost over an entry-level model is typically recovered within 5–7 years through lower energy bills.

GTA Communities We Serve

We install Lennox furnaces across the full GTA — Toronto, Markham, Bolton, Vaughan, Brampton, Mississauga, Richmond Hill, and Newmarket. Bolton office: (905) 951-8080. Markham showroom: 162 Bullock Dr, (416) 268-1115.