Here’s the short version: we prep your home, remove the old unit, set and connect the new furnace, then commission it so the efficiency on the label shows up in real life. Most straightforward swaps are completed in a single workday; complex jobs can take longer. If you’re comparing options, start with our furnace installation page to learn more about our services.
Quick Answer: What Happens On Install Day
You’ll see a clean, ordered sequence: arrival and floor protection, safe shutdown, old unit removal, set-in of the new furnace, venting and condensate routing, gas and electrical connections, duct transitions and filter cabinet, controls and thermostat setup, start-up, commissioning, and a final walkthrough. Heat is typically off during the middle of the job. Our goal is to restore heat before we leave on standard replacements.
Your prep is simple: clear a path to the mechanical room, move fragile items, make driveway space for the truck, and secure pets. Have thermostat access and Wi-Fi ready if you’re using a smart stat. Good preparation removes delays and keeps the project on schedule.
Install Day At A Glance
| Step | What We Do | Typical Duration |
| Arrival & Protection | Walkthrough, floor protection, safety checks | 30–60 min |
| Removal | Shut down, disconnect, haul away old unit | 60–120 min |
| Set & Duct Work | Place furnace, transitions, media filter cabinet | 60–120 min |
| Vent/Drain | Intake/exhaust runs, condensate trap/pump, test | 60–120 min |
| Gas/Electrical | Connect, leak test, breaker/wiring, thermostat | 60–90 min |
| Commissioning | Fan curves, static, temp rise, gas pressure, safeties | 60–90 min |
| Walkthrough | Clean-up, homeowner orientation, paperwork | 20–40 min |
Durations vary by home and scope. We’ll flag anything that could extend the timeline during quoting.
Before We Arrive (Pre-Installation Steps)
Home Assessment And Load Calculation
We start with a brief, practical assessment. That includes room-by-room load calculations and a look at duct condition, total external static pressure, return paths, and filter cabinet size. This is how we right-size the unit and avoid short cycling or under-heating.
We also check the vent route and condensate options, note electrical capacity, and confirm space for service clearances. A few measurements now prevent change orders later. Bottom line: design first, then install.
Equipment And Options You’ll Confirm
We’ll confirm fuel type, AFUE class, staging or modulation level, ECM blower, media filter cabinet, and thermostat compatibility. If you’re still brushing up on efficiency labels, see AFUE explained for what AFUE actually means and what it doesn’t. If you want comfort differences by control type, our staging and modulation guide shows when two-stage or variable-speed is worth it.
These choices shape how the system will feel day to day. We’ll translate features into comfort outcomes for your layout, not just read you a spec sheet.
Permits, Scheduling, And Homeowner Prep
We handle required paperwork and pencil in any inspections that may apply. In Kitchener, the City notes that changing an HVAC heating system typically requires a residential building permit, see City of Kitchener – Residential Building Permits. We’ll confirm local requirements at quoting and include permit handling in the plan.
Before install day, we send a short checklist so you know exactly what to move, what to expect, and when we’ll arrive. A clear path and a ready workspace keep the job tight.
Arrival, Protection, And Removal (Step 1)
Site Protection And Safety Brief
We start with a quick walkthrough, lay floor protection, and verify shut-offs. Tools and materials stay organized to keep pathways clear. We assign roles, review the vent path, and confirm the condensate plan one more time. It’s a simple routine that prevents mess and mistakes.
Safety is non-negotiable. We lock out power as needed, isolate gas, and confirm detector locations. This prep takes minutes and saves hours.
Old Equipment Removal
We disconnect gas and electrical, isolate drains, and remove the old furnace and any obsolete transitions. The area is cleaned and prepped for the new set-in. We recycle or responsibly dispose of the old equipment and packaging. You’re not left with a mess or a mystery pallet on your curb.
If the existing plenum or return is restrictive, we’ll adjust or replace transitions now to preserve airflow and reduce static. This is where comfort starts.
Setting The New Furnace (Step 2)
Positioning, Level, And Clearances
We set the furnace on a pad or platform, level the unit, and confirm service clearances. Filter access is planned so changes are easy. Good positioning prevents future service headaches and keeps the system quiet.
We also verify drain routing, condensate clearance, and a sensible path to a floor drain or pump. Details here pay for themselves in quiet operation and fewer call-backs.
Venting And Combustion Air
For high-efficiency units, we route intake and exhaust to manufacturer specs and municipal guidelines, placing terminations to avoid recirculation, snow drift, or nuisance icing. Joints are sealed and penetrations are finished cleanly. Combustion air supply is verified so the system breathes properly.
Proper venting isn’t just about code. It sets you up for safe, consistent performance for the next decade.
Condensate Management
We install and trap the condensate line with proper slope and supports. If gravity isn’t possible, we add a condensate pump and test it under load. Traps are primed, and safeties are checked so you don’t discover leaks the next day.
Because the condensate circuit runs every heating cycle, we make it bulletproof and easy to service.
Connections And Controls (Step 3)
Gas And Electrical
We size and connect the gas line, set manifold pressure per spec, and soap-test for leaks. On electrical, we confirm circuit and breaker size, bond and ground, then land clean, labelled wiring. If new electrical work is needed, a notification and inspection with the Electrical Safety Authority is required in Ontario. We coordinate that with a licensed electrician when applicable.
These checks are the backbone of safe, efficient operation. Done right, they’re invisible to you – and that’s the point.
Duct Transition And Filtration
Transitions are fabricated to reduce turbulence and balance airflow. We install a media filter cabinet with easy front access, which helps maintain low static pressure and keeps noise down. The goal is smooth air delivery, not just moving air volume.
Better filtration also protects your new heat exchanger and blower over time. It’s a small box that pays big dividends.
Thermostat, Sensors, And Accessories
We wire the thermostat for one-, two-stage, or modulating heat so the furnace can use all its features. We configure fan profiles, dehumidify-on-demand (if supported), and integrate accessories like humidifiers or air cleaners. A communicating stat may be required to unlock advanced modulation – something we confirm before install so your premium furnace isn’t stuck in “dumb” mode.
Clear labelling and a simple control handoff make the system easy to live with from day one.
Commissioning And Proof (Step 4)
Airflow And Static Pressure
We measure total external static and set fan curves to hit design airflow. Readings are recorded and shared, not guessed. This is where comfort and efficiency are secured. If static is high, we adjust filter media, returns, or speeds to get it into range.
Good airflow is quiet airflow. You’ll notice it in steadier room temperatures and fewer on/off jolts.
Temperature Rise And Combustion
We confirm temperature rise falls within manufacturer spec, set gas pressures, and verify flame signal and safety circuits. This protects the heat exchanger and ensures you’re not over- or under-firing the system. It’s a short list, but skipping any item invites problems.
In Ontario, gas appliances must be installed and commissioned to code and manufacturer requirements; the Technical Standards & Safety Authority provides guidance for appliance installation and putting equipment into use. We follow both the book and our internal checklist.
Final Checks And Documentation
We test the condensate system, check vent terminations outside, confirm filter fit, and run the furnace through error codes. You receive a commissioning sheet with static pressure, temperature rise, fan settings, and manifold pressure – plus warranty information and manuals. We finish with a short orientation so you know how to run the system.
Documentation matters. It proves the job is complete, not just installed.
Aftercare: Guarantees, Paperwork, And First-Season Tips
Warranty Registration And Homeowner Orientation
We register your equipment (brand-specific) and leave serial numbers, manuals, and our commissioning sheet. We also show you where to find filter size, how to adjust schedules, and how to use recovery modes on compatible thermostats. If you add AC later, these details keep the system easy to service.
It’s a five-minute briefing that removes guesswork for the next five years.
Maintenance And Early-Warning Signs
Set a reminder for the first filter check and plan a seasonal tune-up after the first heating season. Call us if you notice unusual noises, repeated error codes, or rapid cycling.
Small issues are cheapest to fix early. That’s why we leave you the numbers and what to watch for.
What Can Add Time Or Cost (And How We Prevent It)
Vent Path, Condensate, And Clearances
Obstructions, long vent runs, or lack of a drain can add work. We pre-plan routes and have materials ready to avoid last-minute runs. Where vent terminations must move, we coordinate locations that meet manufacturer guidance and municipal rules.
The fix is simple: design it before demo, not after.
Duct And Return Corrections
High static pressure, starved returns, or tight filter slots can erase comfort gains. We often recommend a media cabinet, an added return, or a minor transition change to protect airflow. It’s not about selling extras – it’s about making your furnace perform as promised.
Even the best equipment can’t overcome a starved duct system. We measure, then decide.
Electrical Or Control Upgrades
Premium staging or modulation sometimes requires updated wiring or a communicating thermostat. If your panel is tight, a small electrical upgrade may be needed. If you’re still undecided on fuel type, review gas vs electric furnace for operating-cost context before you lock in the plan.
We flag these early and price them clearly so your “one-day” install stays that way.
Trusted, Same-Day Furnace Installs Backed by Precision and Experience
Prefer a one-day install with numbers you can trust? We handle the details that protect comfort and efficiency: proper sizing, clean venting and condensate, tight duct transitions, and a documented commissioning sheet. With over 10 years in business, Local Heating and Cooling is an Authorized Lennox Dealer with offices in Kitchener and Waterloo and a HomeStars Best of Award streak. See how our furnace installation services keep the project on schedule and your home warm the same day.
FAQ’s
Most straightforward replacements finish in a single workday. Complex venting, duct fixes, electrical upgrades, or accessory additions can extend the timeline. We’ll flag those at quoting so the day runs to plan.
Heat is off during parts of removal, connections, and commissioning. Our target is to restore heat by the end of the visit on standard replacements. We schedule with weather in mind and can provide temporary space heating if needed.
Yes. Where a permit is required for HVAC changes, we coordinate applications and inspections, then close them out. See City of Kitchener – Building Permits for general guidance.
Yes. We disconnect, haul away, and responsibly recycle or dispose of the old equipment and packaging. You don’t need to arrange a separate pick-up.
Clear a path to the furnace, move fragile items, secure pets, and ensure thermostat and Wi-Fi access. If we’re upgrading controls, have your smart-home login handy so we can connect the app.
Yes. We wire, program, and test the thermostat for your staging/modulation, show you your preferred schedules, and leave a quick-start guide.
We measure static pressure, verify temperature rise, set gas pressures, test safeties, and document the results on a commissioning sheet. You keep a copy for warranty and future service.
Review our gas vs electric furnace guide. We’ll model both options for your home and help you choose based on comfort and operating cost.