How Much Does It Cost to Repair a Heat Pump Compressor?

By Hannah Stephens

May 10, 2025

From condenser coils to expansion valves, getting to grips with the complex parts inside your heat pump is no easy feat. However, understanding what the compressor does (and what can happen when it breaks) can help you spot and repair faults before your heating system breaks down.

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What Is a Heat Pump Compressor?

Your heat pump compressor is essential for transferring heat inside your home. Tubes of refrigerant gas absorb warmth from external air, the ground or a nearby body of water. The compressor compresses the gas, turning it into a hot liquid. This liquid heats the heat exchanger, warming the air inside your house or heating your hot water supply.

What Are the Signs of a Fault Heat Pump Compressor?

Without a properly functioning compressor, your heat pump will struggle to heat and cool your home, and it could stop working. Often, the first sign of a faulty compressor is the pump delivering cold air during heating mode or vice versa. Your heat pump may also struggle to draw electricity, preventing it from switching on.

Faulty heat pump compressors sometimes make a buzzing or humming noise. They're also more prone to refrigerant leaks, which can cause the unit to hiss. Refrigerant leaks are extremely hazardous, so you should call a professional HVAC technician if you notice puddles around your heat pump or hear unusual sounds.

If your heat pump still functions but your compressor isn't working optimally, other parts of your system will work harder to compensate. An overworked system uses more energy than usual, leading to an unexpected spike in energy bills. Any unexplained increase in energy usage is a sign that your heat pump needs repairs.

How Much Does a Heat Pump Compressor Replacement Cost?

The cost of replacing your heat pump compressor depends on the model and make of your unit and the cost of labor in your area. According to HomeGuide, heat pump compressor replacements start at around $500 (CAD 719), although you could spend $2,000 (CAD 2,875) or more if you have an expensive unit.

The cost of replacing a heat pump compressor can also be impacted by the type. Single-stage compressors typically cost $400 to $1,500 (CAD 575 to CAD 2,156) for the part itself, not including installation labor. Two-stage compressors are slightly more expensive, at $550 to $2,000 (CAD 791 to CAD 2,875).

HVAC technicians charge between $75 and $150 (CAD 108 and CAD 216) per hour, excluding the cost of materials and replacement parts. While it can be tempting to attempt the repair yourself to save on labor fees, replacing a heat pump compressor involves handling refrigerant. Therefore, it's too dangerous for most homeowners to tackle unless they have extensive experience working with HVAC systems and a refrigerant handling license.

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Is Replacing the Compressor on My Heat Pump System Worth It?

While replacing the compressor is one of the more expensive heat pump repairs, it usually works out cheaper than replacing the entire unit. Purchasing and installing a heat pump costs between $4,206 and $7,668 (CAD 6,046 and CAD 11,022), plus an extra $3,000 to $7,500 (CAD 4,312 to CAD 10,781) if you need to install additional ductwork to accommodate your new system.

However, replacing the compressor on an old or worn-out heat pump could be a waste of money if you expect to replace the entire unit relatively soon. Most heat pumps last for around 10 to 15 years. If your heat pump is near the end of its lifespan, installing a new one could be more cost-effective.

A total heat pump replacement may also be a better choice if your existing unit breaks down frequently or no longer works efficiently. An HVAC professional can evaluate your system and advise you on the best option for your circumstances and budget.

All CAD conversions are based on the exchange rate on the date of publication.

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