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An HRV (heat recovery ventilator) brings fresh outdoor air into your home while recovering heat from the stale air it pushes out — essential in Edmonton's tightly sealed, energy-efficient homes. Most homes built in Alberta since the late 2000s have one, and its filters, core, and drain need cleaning once or twice a year to keep working properly.
What is an HRV (and how is it different from an ERV)?
An HRV is a balanced ventilation system: it continuously exhausts stale, humid indoor air and draws in fresh outdoor air, passing both streams through a core that transfers heat from the outgoing air to the incoming air. In an Edmonton winter, that means fresh air without throwing away the heat you've paid for.
An ERV (energy recovery ventilator) works the same way but also transfers some moisture between the two air streams, which helps manage humidity. For maintenance purposes, we clean both the same way — filters, core, and drainage.
Why do Edmonton homes have HRVs?
Modern homes are built airtight to conserve heat. That's great for your energy bill, but a sealed home needs mechanical ventilation to bring in fresh air and remove excess moisture — otherwise humidity, odours, and contaminants build up. That's the HRV's job, and it's why ventilation requirements have been part of new-home construction in Alberta for well over a decade.
How does an HRV work?
- 1Stale, moist air is drawn from kitchens, bathrooms, and living areas.
- 2Fresh air is pulled in from outside through a separate intake.
- 3Both streams pass through the HRV core, where heat transfers from the outgoing air to the incoming air without the two mixing.
- 4Pre-warmed fresh air is distributed through the home; stale air is exhausted outside.
Why does an HRV need cleaning?
Because it handles all the air moving in and out of your home, an HRV collects dust and moisture in three key places:
- Filters clog with dust and reduce airflow, making the system work harder.
- The core accumulates fine debris that lowers heat-recovery efficiency.
- The drain pan and lines can collect moisture, mould, and biofilm.
| Task | How often | DIY or pro |
|---|---|---|
| Vacuum / wash the filters | Every 1–3 months | DIY |
| Clean the core | Once or twice a year | DIY or pro |
| Clear the drain pan and lines | Once or twice a year | Pro recommended |
| Full clean with duct service | Every 2–3 years | Pro |
How do you clean an HRV?
- 1Power down the unit and remove the front access panel.
- 2Take out and wash the filters; replace them if they're worn.
- 3Slide out the core and clean it per the manufacturer's method (vacuum and, where allowed, rinse).
- 4Clean the drain pan and flush the condensate line to clear any mould or biofilm.
- 5Wipe the interior, reassemble, and confirm balanced airflow on both streams.
What are the signs your HRV needs attention?
- Windows fogging up more than usual (a sign of poor ventilation)
- Stale or stuffy air despite the system running
- Visible dust on the filters or around the unit
- The unit is louder or running constantly
- You can't recall the last time it was serviced
HRV vs. your furnace filter — what's the difference?
They do different jobs, and you need both. Your furnace filter cleans the air that's already inside as it recirculates through the heating system. Your HRV exchanges that indoor air for fresh outdoor air while recovering heat. A clean furnace filter can't fix poor ventilation, and a working HRV doesn't replace regular filter changes — they work as a team to keep your air fresh and your humidity in check.
How do I get the most from my HRV?
- Check and clean the filters every one to three months — it's the single biggest factor in performance.
- Run the HRV continuously on low rather than switching it off; steady ventilation manages humidity better.
- Use the high-speed or 'boost' setting during showers, cooking, or when the home feels stuffy.
- Have the core and drain professionally cleaned alongside your duct service every two to three years.
Frequently asked questions
How often should an HRV be professionally cleaned?
Clean or replace the filters yourself every one to three months, and have the core and drain professionally cleaned once or twice a year — ideally alongside your air duct cleaning.
Will cleaning my HRV improve air quality?
Yes. A clean HRV moves fresh air efficiently and stops pushing dust and moisture back through your home, which improves both air quality and humidity control.
Do you clean HRVs in newer suburban homes?
Absolutely — newer homes in Leduc, Spruce Grove, St. Albert, and across Edmonton almost all have one. Book a free quote and we'll include the HRV that most cleaners leave out.
