Common HVAC Problems in London Ontario Homes & How to Fix Them
2026 guide by Abdullah Ghzail – real issues we see every week & how to solve them fast
Need Help Today? Call 24/7London, Ontario homes face unique HVAC challenges: cold winters, humid summers, hard water, older ductwork in century homes, and seasonal allergens. As owner and lead TSSA-certified technician at Hawana HVAC Solutions, I’ve diagnosed and fixed thousands of these issues. Here are the **most common HVAC problems** we see in London and Southwestern Ontario — with DIY checks and when to call a pro.
1. Furnace Not Blowing Hot Air (Most Common Winter Problem)
Symptoms: Blower runs but air is cold or lukewarm.
DIY checks: Replace dirty filter (do this monthly in winter). Check thermostat batteries & settings. Look at breaker/fuse box.
Common causes: Failed ignitor ($150–$350), dirty flame sensor, limit switch issue, or gas valve problem.
Fix cost: $200–$600. Call us for same-day diagnosis if DIY steps fail — furnace repair London ON.
2. High Heating or Cooling Bills
Symptoms: Gas/electric bills spike even with normal usage.
Causes: Low-efficiency furnace (80% AFUE or older), dirty coils/filters, duct leaks, poor insulation, or thermostat issues.
Solutions: Annual maintenance + upgrade to high-efficiency system. Goodman 97% AFUE models start at $3,400 installed and cut bills 25–35%.
3. AC Not Cooling or Weak Airflow
Symptoms: Warm air from vents, unit runs constantly, or ice on coils.
DIY checks: Change filter, clear outdoor unit of debris, check breaker.
Common causes: Low refrigerant, dirty evaporator/condenser coils, failing capacitor, or blocked drain line.
Fix cost: $150–$800. See our AC repair London Ontario page.
4. Strange Noises from Furnace or AC
Symptoms: Banging, rattling, grinding, squealing.
Causes: Loose parts, dirty blower wheel, failing motor, or duct vibration.
Action: Turn off system & call pro — can indicate serious issue like cracked heat exchanger.
5. No Hot Water (Water Heater Issues)
Symptoms: Cold showers, slow recovery.
Causes: Failed element (electric), thermocouple/pilot (gas), sediment buildup, or thermostat issue.
Fix vs replace: Repairs $200–$600; new tankless (Navien/Rinnai) starts at $3,500 installed. See water heater repair London ON.
6. Poor Indoor Air Quality
Symptoms: Dust, allergies, stuffy air.
Solutions: Add HRV/ERV for ventilation, humidifier for dry winters, or air filtration upgrade. See air filtration services.
Abdullah Ghzail – Owner & Lead TSSA-Certified HVAC Specialist
I see these problems every week in London homes. Early diagnosis saves money and stress — let our team help you fix it right the first time.
Last updated: March 13, 2026
