24/7 emergency furnace repair
Furnace Repair in Cobourg and Northumberland
No heat, strange noises or a furnace that keeps shutting off? Our licensed technicians repair all makes and models, with emergency service 24 hours a day.
Serving Cobourg, Port Hope, Northumberland, Quinte and Peterborough. Office 9 am to 5 pm, 7 days. Emergency service 24/7.
Request a furnace repair
4.9 ★ on Google
From 895 reviews by local homeowners.
Local since 2005
Showroom and service team on Brook Road North, Cobourg.
Written guarantees
On every installation. See them.
$1,000 Off a New Lennox Furnace
Get your home ready for winter. Save $1,000 on a qualifying new Lennox furnace, installed by our local Cobourg team. Offer ends December 1, 2026.
Common furnace problems we fix
No heat at all
Ignition, flame sensor, control board, pressure switch or gas valve faults.
Furnace turns on and off
Short cycling from a dirty flame sensor, clogged filter, oversized unit or overheating.
Blowing cold air
Ignition failures, limit switch trips or a blocked condensate drain on high-efficiency furnaces.
Loud or strange noises
Banging, squealing or rattling from the blower motor, bearings, belts or delayed ignition.
Some rooms are cold
Airflow, ductwork, blower speed or zoning problems.
Error codes or flashing lights
We read the code, find the cause and fix it properly, not just reset it.
Before you call, check these
Still no heat? Our guide Furnace Not Working? 7 Checks to Try Before You Call walks through each step. If you smell gas, leave the house and call your gas utility from outside right away.
- Thermostat is set to Heat and a few degrees above room temperature, with fresh batteries
- The furnace switch near the unit is on and the breaker has not tripped
- The furnace door is closed tightly, since a safety switch stops it if the door is open
- The filter is not clogged
- Outdoor vent pipes are not blocked by snow or ice
How our repair visits work
Step 1
Diagnosis
We test the full system, not just the part that failed, and explain what we found.
Step 2
Clear options
You get the repair options before any work starts. No surprises.
Step 3
Repair and test
Most repairs are done on the first visit with parts from our stocked trucks, then we test for safe operation.
Repair or replace?
If your furnace is over 15 years old and needs a major part such as a heat exchanger or control board, replacing it can make more sense than repairing. We will always give you an honest recommendation. See how to decide, or explore new Lennox furnaces.
Emergency furnace repair, day or night
Furnaces fail on the coldest nights. Our emergency team is available 24 hours a day, 7 days a week across Cobourg, Port Hope and Northumberland. Learn about emergency service.
What Comfort Zone customers say
Just recently contacted them for a service call and they responded quickly. Awesome all around experience. Highly recommend!
I called in the mid morning for a propane furnace issue and was fixed and running by 130 in the afternoon.
AJ the service tech was very friendly, knowledgeable and explained exactly what was causing the issue and remedied it accordingly.
Five stars all the way around.
Pay Monthly Using NGL
Spread the cost of a new furnace, heat pump, air conditioner or water heater into one monthly payment, with parts, labour and repairs covered for the term.
Frequently asked questions
Do you repair all furnace brands?
Yes. Our technicians repair Lennox and all other major brands of gas, propane and oil furnaces.
How fast can you come?
We aim for same-day or next-day service during office hours, and our emergency team handles no-heat calls 24/7.
Why does my furnace keep shutting off?
Common causes are a dirty flame sensor, a clogged filter, a blocked vent or an overheating limit switch. A technician can find the exact cause safely.
Is my furnace under warranty?
Many newer furnaces carry parts warranties of 10 years or more if registered. Bring your model and serial number and we will check.
What if I smell gas?
Leave the home immediately, do not use switches or phones inside, and call your gas utility or 911 from outside.
Related services
Emergency furnace repair
No heat tonight? We answer 24/7.
Furnace maintenance
Prevent breakdowns with a yearly tune-up.
Furnace installation
$1,000 off a new Lennox furnace until December 1, 2026.
Need your furnace fixed?
Call us or book online and we will confirm within 24 hours. Office hours 9 am to 5 pm, 7 days a week, with emergency service 24/7.