Why Is My Heat Pump Running Constantly in Toronto, OH?
March 7th, 2026
4 min read
Why Your Heat Pump Runs Constantly in Toronto
A heat pump in Toronto may run constantly when outdoor temperatures fall below 30–35°F because the system must run longer to maintain indoor temperature. Toronto sits along the Ohio River floodplain, where humidity, fog, and soil moisture can increase heat loss and cause heat pumps to operate longer heating cycles.
If your heat pump seems like it never shuts off in Toronto, you're not alone. Homes located along the Ohio River corridor often experience longer heating cycles because the air tends to be colder and more humid near the river. River fog, wet soil conditions, and older housing construction can all increase heat loss.
When homes lose heat faster, the heat pump must run longer to maintain comfort. Sometimes that’s normal winter operation. Other times it means something in the system or home needs attention.
Why Does My Heat Pump Run Constantly in Toronto?
Quick Answer
Heat pumps run longer cycles when outdoor temperatures fall below 35°F because there is less usable heat in the outdoor air. In Toronto’s river floodplain environment, humidity and fog increase frost buildup on outdoor units, which leads to more defrost cycles and longer heating runtimes.
Heat Pumps Work Differently Than Furnaces
Heat pumps deliver air around 85–95°F, while gas furnaces typically deliver air between 120–140°F.
Because the air temperature is lower, the system must run longer to maintain indoor temperature. Longer runtime during cold weather is often normal.
How Long Should a Heat Pump Normally Run?
Quick Answer
During Toronto winters, a heat pump may run 30–90 minutes per cycle when outdoor temperatures fall below 35°F. When temperatures fall into the 20°F range, the system may run nearly continuously while still maintaining the thermostat setting.
Typical Winter Heat Pump Run Times
| Outdoor Temperature | Typical Run Time |
|---|---|
| 45°F | 10–20 minutes |
| 35°F | 20–40 minutes |
| 25°F | 40–90 minutes |
| 15°F | Nearly continuous |
If the home reaches thermostat temperature, this behavior is usually normal.
Why Heat Pumps Behave Differently in the Upper Ohio Valley
Quick Answer
Heat pumps often run longer in the Upper Ohio Valley because the region combines river humidity, cold winter temperatures, hillside wind exposure, and older housing insulation. These conditions increase heat loss and can cause heat pumps to operate 20–40% longer than systems in flatter inland climates.
Communities across this region include:
- Steubenville
- Wintersville
- Toronto
- Mingo Junction
- Brilliant
- Hooverson Heights
- Weirton
- Follansbee
- Wellsburg
- New Cumberland
- Colliers
Regional conditions affecting HVAC performance include:
- Ohio River humidity
- Cold air settling in valleys
- Wind exposure across hills and ridges
- Older housing construction with insulation gaps
How Toronto’s River Location Affects Heat Pump Run Time
Quick Answer
Toronto’s location along the Ohio River floodplain exposes homes to higher humidity, fog formation, and wet soil conditions, which can increase frost buildup on outdoor coils and cause heat pumps to run longer during winter.
River Fog and Humidity
Cold air moving across the river often produces fog and damp conditions. This can lead to:
- Frost buildup on outdoor coils
- More defrost cycles
- Longer heating runtimes
When the system enters defrost mode, heating pauses briefly, which can make the system appear to run constantly.
Soil Moisture and Drainage Patterns
Floodplain soil near the river often stays damp longer than upland soil. This can cause:
- Cooler basement temperatures
- Higher humidity in crawlspaces
- Heat loss through foundation walls
If ductwork runs through these areas, the heat pump may run longer to maintain comfort.
Older Housing Construction
Many Toronto homes were built between 1940 and 1975. Common conditions include:
- Limited attic insulation
- Older windows
- Basement ductwork
- Air leakage around foundations
These conditions increase heating demand during winter.
What Is Auxiliary Heat and Why Does It Turn On?
Quick Answer
Auxiliary heat activates when outdoor temperatures fall below about 30°F or when the heat pump cannot keep up with heating demand. Electric heat strips provide additional heating but consume more electricity than the heat pump itself.
Auxiliary heat may activate when:
- Outdoor temperature drops quickly
- Thermostat settings increase several degrees
- The home loses heat faster than the system can replace it
Does Constant Running Increase Energy Costs?
Quick Answer
Long heat pump cycles can be efficient because these systems operate best during steady runtime. However, if auxiliary heat runs frequently, electricity usage can increase significantly.
If the system maintains temperature while running constantly, it may still be operating efficiently.
When Constant Running Is Normal vs a Problem
Quick Answer
Continuous operation is normal when outdoor temperatures fall below 35°F and the home reaches thermostat temperature. If the system cannot maintain temperature or auxiliary heat runs constantly, service may be needed.
Often Normal
- Outdoor temperature below 35°F
- Home reaches thermostat setting
- Auxiliary heat runs occasionally
- No unusual system noises
Possible System Problem
- Thermostat never reaches temperature
- Auxiliary heat always running
- Outdoor unit icing repeatedly
- Sudden increase in energy bills
Quick Checks Homeowners Can Try First
Quick Answer
Before scheduling service, homeowners should check the air filter, supply vents, thermostat settings, and outdoor temperature.
Try These Steps First
- Replace the air filter
- Make sure supply vents are open
- Confirm thermostat settings
- Check outdoor temperature
If the system still cannot maintain temperature afterward, a professional inspection may be needed.
Example from a Toronto Home
Quick Answer
A typical Toronto home built in the 1960s with about 1,600–1,800 square feet and moderate attic insulation may experience nearly continuous heat pump operation when temperatures fall below 25°F, especially when river humidity increases frost buildup on the outdoor unit.
This often reflects environmental conditions rather than equipment failure.
How Long Heat Pumps Usually Last
Quick Answer
Most residential heat pumps last 12–15 years in the Ohio Valley climate. Older systems may run longer cycles as efficiency declines.
Routine maintenance helps extend system life.
Frequently Asked Questions
Is It Normal for My Heat Pump to Run All Day in Winter?
Quick Answer
Yes. When outdoor temperatures fall below 30–35°F, heat pumps often run longer cycles to maintain indoor comfort.
Is It Bad If My Heat Pump Never Shuts Off?
Quick Answer
Continuous operation during cold weather can be normal if the home reaches thermostat temperature. If the home never warms up, the system may require service.
What Should I Do If My Heat Pump Runs Constantly?
Quick Answer
Check the air filter, make sure vents are open, and confirm thermostat settings. If the system cannot maintain temperature or auxiliary heat runs constantly, schedule a service inspection.
What Guarantees Do You Offer?
Quick Answer
Honest Fix provides two major protection programs depending on the service performed.
Lifetime Trust Shield — New HVAC Installations
- Lifetime labor protection (15 years of labor coverage, representing expected system life)
- No-lemon replacement guarantee
- Energy savings guarantee
- 90-day satisfaction guarantee
Service Trust Guardian — Repairs and Maintenance
- 5-year labor warranty on repairs
- No overtime charges
- On-time arrival guarantee
- Clean work area guarantee
- 60-day satisfaction guarantee
Many heat pumps that run constantly are simply responding to cold weather and home heat loss. Others may need airflow corrections, insulation improvements, or mechanical adjustments.
Clear diagnosis should come before any repair recommendation.
Free exact quote on new systems or schedule your service call online now.
Scott Merritt is a co-founder of Honest Fix Heating, Cooling and Plumbing and brings more than 30 years of experience across HVAC, leadership, and industry education. He serves in a senior leadership and oversight role, providing licensed guidance, reviewing HVAC educational content, and supporting technician training and documentation standards. Prior to co-founding Honest Fix, Scott founded and owned Fire & Ice Heating & Air Conditioning in Columbus, Ohio, which he operated for more than two decades before selling the company in 2025. During that time, he led programs and partnerships including Carrier Factory Authorized Dealer, Trane Comfort Specialist, and Rheem Pro Partner, helping establish high technical and training standards. Scott is the Ohio State HVAC license holder for Honest Fix and provides licensed oversight to help ensure work meets applicable codes and manufacturer requirements. Learn more about Scott’s background and role at Honest Fix by viewing his full leadership bio.
