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Heating services - GTA
Certified HVAC technicians delivering reliable, energy-efficient furnace services for homeowners across Toronto and the Greater Toronto Area.
Complete furnace services
From a first-time high-efficiency installation to same-day emergency repairs, Nexa covers every furnace need with transparent pricing and a customer-first approach.
Installation & replacement
Precise, code-compliant installations for new builds and replacement projects. We size systems accurately and commission every unit for peak efficiency from day one.
24 / 7 response
Fast, dependable diagnostics and repairs for all furnace makes and models. From inconsistent heating to complete breakdowns, we restore comfort quickly and safely.
Preventive care
Annual tune-ups that protect your investment, improve efficiency, and reduce the chance of mid-winter breakdowns. Best scheduled in early fall before heating season.
Why upgrade your furnace
Modern high-efficiency furnaces (90% AFUE and above) deliver real savings, quieter operation, and more consistent warmth compared to older units approaching end of life.
High-efficiency units can reduce heating costs by up to 30% compared to standard models, with savings that compound every winter.
Variable-speed blowers distribute heat more evenly room to room, eliminating cold spots and reducing temperature swings.
Newer furnaces run significantly quieter than older models, with modulating operation that rarely surges to full capacity.
Many high-efficiency models qualify for government rebates and utility incentives, reducing your upfront investment.
When to call us
Catching issues early saves money and prevents mid-winter breakdowns. If you notice any of the following, contact Nexa for a diagnostic assessment.
Banging, rattling, squealing, or popping sounds often indicate loose components, worn parts, or airflow restrictions that need immediate attention.
Uneven temperatures between rooms, or difficulty maintaining your thermostat setting, point to airflow problems or a declining heat exchanger.
A sudden spike in monthly heating costs - without a change in weather - often means your furnace is working harder than it should to deliver the same output.
Short cycling (turning on and off rapidly) or running constantly may signal thermostat issues, a dirty filter, or a heat exchanger problem.
Excess dust, dry air, or worsening allergy symptoms can indicate your furnace is not filtering or circulating air effectively through the home.
A healthy burner flame is blue. Yellow or orange indicates incomplete combustion - a potential carbon monoxide hazard requiring urgent inspection.
Furnaces older than 15-20 years are approaching end of life, losing efficiency, and accumulating repair costs that often exceed replacement value.
If you've called for furnace repairs more than twice in the past two years, the ongoing cost may exceed the investment in a new high-efficiency system.
Burning or musty smells at startup can indicate dust buildup, a cracked heat exchanger, or a gas issue - all worth a professional inspection.
Warm-air supply vents blowing cool air suggest a malfunctioning blower, failed ignition, or a gas supply issue that needs same-day diagnosis.
A pilot light that won't stay lit, or an igniter that fails to fire consistently, are early signs of component wear that will worsen with time.
Surface rust or corrosion on the furnace body, flue, or heat exchanger indicates advanced wear - and may point to a cracked exchanger that requires replacement.
How it works
From the first call to ongoing support, every Nexa furnace project follows a clear, consistent process built around transparency and long-term reliability.
We evaluate your home's layout, insulation, existing ductwork, and heating needs to build an accurate picture before recommending any system or scope of work.
You receive clearly explained options - furnace type, efficiency rating, sizing, and compatible thermostat upgrades - matched to your budget and comfort goals.
Our licensed technicians complete every job to code, with careful attention to gas connections, duct sealing, and commissioning tests before we leave the site.
We stay available for follow-up questions, annual tune-ups, and future upgrades - building a long-term service relationship around your home's comfort.
Why choose Nexa
GTA homeowners choose Nexa for honest advice, premium equipment, transparent pricing, and a team that stays accountable after the job is done.
Every technician holds the certifications required under Ontario TSSA regulations. We carry proper liability insurance and follow current gas code on every job.
As a certified Lennox dealer, we install top-tier, energy-efficient systems backed by industry-leading warranties. No grey-market equipment, ever.
We provide clear, itemized quotes before any work begins. No hidden fees, no surprise charges - just straightforward pricing you can plan around.
Decades of furnace installations and repairs across Toronto, Mississauga, Oakville, and the wider GTA give our team a practical depth that newer contractors can't match.
Furnaces fail at the worst times. Our emergency line is available around the clock so you're never left in the cold waiting for the next business day.
All installations include manufacturer equipment warranties and our own workmanship guarantee, giving you layered protection and real peace of mind.
Book your service
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Furnace FAQs
Common questions about furnace sizing, maintenance intervals, efficiency upgrades, and when to repair versus replace your heating system.
Proper sizing depends on your home's square footage, ceiling height, insulation quality, and window count. Our technicians perform a detailed heat load calculation (Manual J) before recommending any system - an oversized furnace short-cycles and wastes energy, while an undersized one can't keep up during a deep freeze.
Once a year, ideally in early fall before heating season begins. A professional tune-up includes cleaning the burner and heat exchanger, testing safety controls, inspecting the flue, checking the blower motor, and replacing or inspecting the filter. Consistent maintenance can extend furnace lifespan by five to ten years and reduce energy use.
High-efficiency furnaces (90% AFUE or higher) extract significantly more heat from the same amount of gas compared to older standard-efficiency models. Benefits include heating bills reduced by up to 30%, more even room-to-room temperatures, quieter variable-speed operation, and eligibility for government rebates and utility incentives available in Ontario.
Most gas furnaces last between 15 and 20 years with consistent maintenance and regular filter changes. Lifespan is also affected by the quality of the original installation and whether the system was properly sized. Once a furnace exceeds 15 years and starts requiring frequent repairs, replacement usually makes more financial sense.
Start with the basics: check that the thermostat is set to Heat and the temperature is set above room temperature; verify the circuit breaker for the furnace hasn't tripped; check that the gas valve is open; and inspect your air filter - a completely clogged filter can trigger a safety shutoff. If none of these resolve the issue, call Nexa for a same-day diagnostic.
A useful guideline is the "50% rule": if the cost of a repair exceeds 50% of what a new furnace would cost, replacement is usually the smarter investment. Additional signals that replacement is worth considering include the unit being over 15 years old, a pattern of repeat repairs in recent seasons, consistently rising energy bills, and uneven heating throughout the home. Our technicians provide an honest assessment without any pressure toward a particular decision.
Several steps make an immediate difference: replace the air filter every 1-3 months, seal obvious duct leaks in accessible areas, upgrade to a programmable or smart thermostat, and ensure all supply and return vents are unobstructed by furniture or rugs. A professional tune-up typically yields the largest single efficiency gain for an existing system.
A poorly maintained furnace can circulate dust, allergens, and combustion byproducts throughout the home. A cracked heat exchanger is the most serious concern - it can allow carbon monoxide to enter your living space. Annual inspections catch these issues early. Pairing a new high-efficiency furnace with a high-MERV filter or electronic air cleaner significantly improves overall indoor air quality.
Furnace service areas
Our furnace installation, repair, and maintenance teams are dispatched from centrally located facilities to reach most GTA locations efficiently.
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