Common HVAC Problems in London Ontario Homes & How to Fix Them

Common causes include a dirty filter restricting airflow, failed ignitor ($150–$350), dirty flame sensor, or a thermostat issue. First, check your filter and thermostat batteries. If the filter is clean and thermostat is working, the ignitor or flame sensor likely needs professional attention. Call a TSSA-certified technician to diagnose safely.

Low refrigerant is the most common cause, followed by dirty evaporator coils, a failing capacitor, or a blocked condensate drain. First, check that your filter is clean and the outdoor unit is clear of debris. If it's still not cooling, you likely have a refrigerant leak or component failure—a technician can diagnose and fix the issue. Turn off the system if you see ice on the coils.

High heating bills usually mean your furnace is struggling to keep up. Common causes: dirty filter restricting airflow, low-efficiency 80% AFUE furnace, duct leaks, poor insulation, or thermostat issues. Annual maintenance can catch these problems early. Upgrading to a 97% AFUE furnace like Goodman can cut bills 25–35%. Ask about our free energy assessment.

Banging sounds often indicate loose components, a dirty blower wheel causing imbalance, or a failing motor. Rattling may be from duct vibration or loose panels. Grinding or squealing indicates bearing failure. Turn off the system immediately and call a professional—these noises can indicate serious issues like a cracked heat exchanger or motor failure. Don't ignore them.

For electric water heaters, a failed element is the most common cause ($200–$400 repair). For gas units, the thermocouple or pilot light may have failed ($200–$500). Sediment buildup can also cause poor performance. If your tank is over 12 years old, replacement ($2,700–$3,500 for tank, $3,500+ for tankless) may be more cost-effective than repair. Enbridge rebates available for high-efficiency models.

Apply the 50% rule: if repair costs exceed 50% of replacement cost, replace. Also replace if your furnace is 15+ years old, has a cracked heat exchanger (safety hazard), or repair frequency is increasing. A new Goodman 97% AFUE furnace starts at $3,400 installed and can cut gas bills 25–35% compared to older 80% models. We provide honest repair vs replace advice.

First, check your thermostat batteries and settings, replace dirty filter, and check the breaker panel. If it still won't start, call a TSSA-certified technician. Hawana offers 24/7 emergency service with zero after-hours surcharge—you pay the same rate at midnight as at noon. We typically respond within 2–4 hours in London. Don't wait until pipes freeze.

Ice on AC coils means restricted airflow or low refrigerant. First, turn off the system immediately (running it will damage the compressor). Check your filter—a dirty filter is the most common cause. If the filter is clean, you likely have a refrigerant leak or airflow restriction that requires professional diagnosis. Don't run the AC until the issue is fixed.

Standard 1-inch filters: every 1–3 months depending on usage and pets. During peak heating or cooling seasons, check monthly. Pleated MERV 8–11 filters may last 3–6 months. Dirty filters are the #1 cause of HVAC problems—they restrict airflow, cause freezing, increase energy bills, and can lead to expensive repairs. Set a calendar reminder to check yours.

Common causes: low humidity in winter (20–30%) causing dry skin and static, high humidity in summer (60%+) promoting mold and dust mites, inadequate ventilation trapping pollutants, and dirty ducts circulating allergens. Solutions include whole-home humidifiers ($800–$1,800), HRV/ERV ventilation ($2,500–$5,500), and air filtration upgrades ($300–$1,500). We offer free IAQ assessments.