How a dirty heat pump raises your energy bill
Most efficiency losses in a heat pump aren't dramatic. They're quiet. Which is exactly what makes them expensive.
Why dirty = less efficient
A heat pump moves heat by forcing air across a coil. When the coil is dusty or coated in biofilm, two things happen: the surface area drops, and the insulating layer slows heat transfer. The system compensates by running longer, which means more compressor hours, which means more electricity.
Energy audits typically measure 10 to 25% efficiency loss in an uncleaned system. The exact number depends on how bad the buildup is.
What that costs in dollars
A typical Halifax home with a heat pump uses about $1,800 to $2,400 a year in electricity for heating and cooling. A 15% efficiency loss translates to $270 to $360 a year. That's every year it stays dirty.
A $199 annual cleaning pays for itself in energy savings alone, before you count the warranty protection or the longer compressor life.
Why you don't notice until it's severe
Efficiency loss is gradual. A 2% drop month over month feels like nothing. But over three years, it adds up to 70% of what it used to deliver. Most homeowners adjust to it unconsciously, turning the thermostat up a degree at a time.
The wake-up call is usually a surprise winter bill, a system that can't keep up on a cold night, or a compressor failure.
Common questions
- How can I measure my own efficiency loss?
- Compare last winter's bill to this winter's, adjusted for weather. If it's up more than 10% with similar outdoor temperatures, cleaning is likely to help.
- Will a clean heat pump really pay for itself?
- In a typical Halifax home, yes. The electricity savings usually cover the cost of the annual clean in the first 6 to 8 months.
- What else affects heat pump efficiency?
- Refrigerant charge, filter condition, outdoor unit clearance, and thermostat setpoints all matter. Cleaning addresses the biggest lever.
Ready for a deep clean?
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