Autumn is a beautiful time in Southern Connecticut – but it’s also your last opportunity to prepare your furnace for the long haul through winter. A properly tuned system not only improves comfort but can save you on energy bills and prevent costly breakdowns when temperatures plunge.
Here’s a last-minute heating system checklist every homeowner should follow before winter sets in.
1. Check System Pressure and Vents
Your furnace’s pressure should fall within the manufacturer’s recommended range. Too low or too high can cause strain or inefficiency.
What to do:
- Inspect pressure gauges
- Make sure ventilation isn’t blocked by debris, leaves, or outdoor storage
- Confirm intake and exhaust vents are clear and unobstructed
Proper pressure ensures optimal combustion and safe operation.
2. Listen for Kettling or Strange Noises
A healthy furnace should run quietly. Unusual sounds like clanking, rattling, or kettling (a rumbling boil-like noise) are indicators of trouble.
Why it matters:
- Kettling usually means heat exchanger scale buildup
- Rattling/Clanking could point to loose parts or airflow issues
If your system is noisy or hesitant to heat, booking an inspection now can uncover these issues before they turn into breakdowns.
3. Clean the Burners and Interior Components
Over months of use, dust, soot, and debris can collect on burners, flame sensors, and other internal parts. This buildup reduces efficiency and may cause flame instability – a safety concern.
Checklist:
- Remove and clean burners
- Wipe down flame sensors
- Vacuum out dust from interior chamber
This step improves fuel efficiency and helps your furnace ignite smoothly.
4. Calibrate the Thermostat
It’s easy to forget the thermostat, but an uncalibrated or malfunctioning thermostat can make your furnace work harder than it should.
Smart tips:
- Upgrade to a programmable or smart thermostat if you haven’t already
- Compare displayed temperature to an independent thermometer
- Fine-tune settings for comfort and energy savings
Accurate thermostat readings mean fewer heating surprises.
5. Schedule a Professional Inspection
Even a thorough DIY check can miss underlying problems. That’s why an annual heating system inspection by certified technicians is essential.
At Onze Plumbing & Heating, our fall furnace inspection includes:
- Full safety evaluation
- Pressure testing
- Burner cleaning and calibration
- Airflow and thermostat checks
- Recommendations for any needed repairs
Joining our annual maintenance plan ensures priority scheduling, discounted repairs, and HVAC peace of mind through winter’s worst weather.
Stay Warm All Winter Long
Don’t wait for your furnace to fail on the coldest night of the year. Use this checklist now – and schedule your professional inspection with Onze Plumbing & Heating to keep your home safe, efficient, and cozy through winter.

