Heat Pump Blowing Cold Air in Heat Mode Greater Vancouver

A heat pump in heating mode delivers air that feels warm but is typically 30 to 45 degrees Celsius from the supply vent — cooler than furnace output. This surprises homeowners used to gas or electric furnaces.

What This Means

Furnaces deliver air at 50 to 65 degrees Celsius — hot to the touch. Heat pumps deliver air at 30 to 45 degrees Celsius — warm but not hot. This feels cool in comparison, but delivers adequate heat when the system runs at the correct output. Truly cold air from a heat pump in heat mode indicates a fault.

Common Causes

• Normal: heat pump in defrost cycle — briefly delivers cool air for 2 to 5 minutes
• Normal: heat pump warming up — first few minutes after startup the air temperature gradually rises
• Fault: reversing valve stuck in cooling mode — delivers cold air continuously in heat mode
• Fault: refrigerant very low — heat pump has no capacity to heat indoor air
• Fault: indoor coil icing — frost on the indoor coil causes poor heat transfer

What Homeowners Can Check Safely

• If the air has felt cool for only a few minutes, wait — the heat pump may be in defrost or warming up
• If cool air has continued for more than 10 minutes of operation, a fault is likely

When to Call a Licensed Technician

Heat pumps contain refrigerant under pressure, electrical components at line voltage, and control systems that require specialized diagnostic tools. Do not open refrigerant circuits, bypass safety switches, or attempt to recharge refrigerant without proper certification.

• Reversing valve testing — confirm whether the valve is correctly switching to heating position
• Refrigerant pressure testing
• Indoor coil inspection for icing
• Defrost system functional test

Frequently Asked Questions

Why does my heat pump produce air that feels only slightly warm?

This is usually normal. Heat pumps produce supply air at 30 to 45 degrees Celsius — warmer than room air (typically 20 to 22 degrees) but cooler than furnace output. The key is that the heat pump runs longer and more steadily, delivering a continuous stream of warm air that accumulates in the room. Stand near the supply vent and feel the air for 30 seconds — it should feel clearly warm, not room temperature.

My heat pump was producing hot air last week but now only lukewarm. What changed?

A gradual reduction in supply air temperature usually indicates refrigerant loss. As refrigerant decreases, the heat pump loses capacity and supply air temperature drops. The system may still heat the home in mild weather but underperform on colder days. A technician can confirm with a refrigerant pressure test.

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