Rooms Not Heating Evenly After New Furnace in Toronto | Fast Diagnosis
- For Saving
- 10 hours ago
- 4 min read
If some rooms are still cold after a new furnace, the issue isn’t the unit—it’s airflow. Toronto homes often need proper commissioning: measure static pressure, set the ECM blower to the right CFM, verify return sizing, and balance the ducts. Our licensed team restores even, quiet heat across every floor with low-disruption corrections and clear, written warranties.
Answer Capsule (what to do now)
Uneven rooms after a new furnace usually mean return air limits, high static pressure, ECM blower not commissioned, restrictive filters, or closed/mis-set dampers.
Do three quick checks: replace the filter, open every supply/return, run Fan = On for 10 minutes. If temperatures even out, you need blower re-profiling + duct balancing.
Book a commissioning visit to measure static pressure (with instruments), set airflow (CFM), and correct returns/registers so every room heats evenly.
Key Facts (Toronto/GTA)
Older Toronto semis, wartime bungalows, and reno’d spaces often lack upper-floor return air, the #1 cause of cold bedrooms.
A new high-efficiency furnace won’t fix duct constraints; commissioning matches blower airflow to your actual ductwork.
Many homes see same-day improvements with ECM programming, balancing, and small grille adjustments.
For upgrades or replacements, see Furnace Installation Greater Toronto and Furnace Installation Toronto.
Why “rooms not heating evenly after new furnace Toronto” happens
Even comfort depends on moving the right airflow to the right rooms—quietly and consistently.
Undersized or missing returns (especially upstairs). The blower can’t “breathe,” so far rooms starve first.
ECM blower not commissioned. Factory defaults rarely match real ducts; target CFM must be set and verified.
High static pressure. Tight transitions, long flex runs, restrictive grilles, and A-coil drops push resistance beyond what the blower can overcome.
Closed/mis-set dampers or blocked grilles. Post-install, a partially closed register can throw the whole home off balance.
Filter restriction. Dirty or ultra-high-MERV media in a small rack increases pressure drop and robs airflow.
Legacy duct design. Additions, finished basements, or attic conversions often have undersized branches.
Quick homeowner checks (5 minutes each)
Swap the filter (correct size, arrow toward furnace). High MERV is fine only if your return/filter rack is sized for it.
Open every supply and return; clear furniture within 1 metre.
Thermostat Fan = On for 10 minutes. If rooms even out, you need ECM re-profiling and balancing.
Check door undercuts. Tight bedroom doors without a return path trap air.
List hot/cold rooms by floor and time of day—handy for targeted fixes.
Our commissioning-grade diagnostic (Toronto & GTA)
For Saving Home Services Inc doesn’t guess—we measure, set, and verify:
Static pressure test across furnace and coil to locate restrictions.
Airflow (CFM) verification & ECM programming to match blower output to your duct reality.
Room-by-room balancing with documented damper positions for stable comfort.
Return-air assessment (add/resize returns, install transfer grilles where needed).
Supply-side improvements (larger grilles, better transitions, shorter flex where practical).
Low pressure-drop filtration strategy so cleaner air doesn’t starve far branches.
Fixes that deliver even heat—fast
Add/resize upper-floor returns. A high-impact correction for cold second-floor bedrooms.
Re-profile ECM speeds/curves. Hit target CFM without hiss or draft.
Increase grille free area. Swap restrictive registers to reduce noise and resistance.
Smarter sheet-metal. Proper transitions and turning vanes calm airflow and recover CFM.
Smart thermostat circulation. Low-speed fan between calls smooths temperatures without big hydro bills.
Targeted duct balancing. We mark and document for repeatable performance.
Keep rooms even after install (preventive plan)
Commissioning on day one. Verify static, temperature rise, and airflow—record the numbers.
Seasonal filter cadence. 1” filters: 1–3 months; media cabinets: follow specs (sooner with pets/renos).
Annual maintenance. Small drift in settings can snowball into uneven rooms—catch it early.
Post-reno review. Finished spaces change airflow; re-check returns and balance.
Mini-guide: balance the home tonight (DIY trial)
Open upper-floor supplies 100%; partially close basement registers ~25–50% to push air upstairs.
Run Fan = On for the evening. If comfort improves, ask us to set a low-speed circulation profile.
Crack bedroom doors until undercuts/transfer paths are confirmed.
Replace the filter if it looks grey or is older than a month.
Note which rooms improved—that pattern helps us target restrictions.
Helpful internal resources
Planning an upgrade? Start with Furnace Installation Greater Toronto for best-practice installs and options.
Need same-day help? Explore Furnace Installation Toronto for service details and fast booking.
GTA service areas & quick booking links
We solve uneven heat across Toronto, Markham, Mississauga, Vaughan, Richmond Hill, Scarborough, North York, and more—often same day in heating season.
Service Area (Anchor Text) | Direct Link |
Why trust For Saving Home Services Inc - Best HVAC GTA
Licensed & insured technicians serving the GTA for years.
Commissioning-first approach—we test, set, and balance instead of guessing.
Transparent pricing + written warranties.
Local expertise across Toronto housing styles—from post-war bungalows to modern infills.
Three GTA locations (Toronto, Markham, Mississauga) for faster response.
FAQ: rooms not heating evenly after new furnace in Toronto
Why are bedrooms still cold after my new furnace?
Upper-floor returns are often undersized or missing, and duct static can be high. Adding an upstairs return plus ECM re-profiling typically solves it.
Can balancing alone fix uneven rooms?
It helps, but if returns are limited or static is excessive, dampers can’t overcome physics. We pair balancing with return/grille/transition corrections.
Do high-MERV filters cause uneven heat?
They can if the rack/returns are too small. We select low pressure-drop media and confirm airflow with instruments.
Will Fan = On increase my hydro bill?
Modern ECM blowers are efficient. A low-speed circulation setting smooths temperatures with a modest energy impact—often worth it for comfort.
How fast can you fix this?
Many homes see same-day improvements through ECM programming, balancing, and small grille changes. Duct/return upgrades are scheduled promptly and backed by a written warranty.
Ready for even comfort? Explore Furnace Installation Greater Toronto for upgrade options or call our team to schedule a same-day airflow diagnostic.
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