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HRV vs. ERV: Which Ventilation System Does Your Home Need?
Learn the difference between HRVs and ERVs, how they work, which is best for Ontario homes, and why regular maintenance matters
HOME INSPECTION NEWS & INSIGHTS
7/24/20263 min read
Modern homes are built tighter than ever before. Better insulation and improved air sealing make homes more energy efficient—but they also trap moisture, odors, and indoor pollutants.
That's where Heat Recovery Ventilators (HRVs) and Energy Recovery Ventilators (ERVs) come in. These systems provide continuous fresh air while helping reduce energy loss, making them an important part of a healthy and comfortable home.
If you're buying a home or already own one, understanding how these systems work can help you keep your home healthier and your HVAC system operating efficiently.
What Is an HRV?
An HRV (Heat Recovery Ventilator) exchanges stale indoor air with fresh outdoor air while recovering heat from the outgoing air during the winter.
Here's how it works:
Stale air is exhausted from bathrooms, kitchens, and laundry rooms.
Fresh outdoor air is drawn into the home.
Heat from the outgoing air is transferred to the incoming air through a heat-exchange core.
The two air streams never mix.
HRVs are best suited for:
Cold climates like Ottawa and much of Ontario
Homes with excess indoor humidity during winter
Homes experiencing window condensation
Newer airtight homes
An HRV helps remove excess moisture that can contribute to condensation and mold growth.
What Is an ERV?
An ERV (Energy Recovery Ventilator) works similarly to an HRV but transfers both heat and moisture between the incoming and outgoing air streams.
During winter:
Some indoor moisture is retained, preventing the home from becoming excessively dry.
During summer:
Some outdoor humidity is removed before fresh air enters the home, reducing the cooling load on the air conditioner.
ERVs are ideal for:
Homes with central air conditioning
Homes occupied year-round
Homes where maintaining comfortable humidity is important
Mixed or humid climates
HRV vs. ERV: What's the Difference?
Which One Is Better in Ontario?
There isn't a one-size-fits-all answer.
An HRV may be the better choice if:
Your windows regularly develop condensation in winter.
Your home feels humid during the heating season.
You want to remove excess moisture from the home.
An ERV may be the better choice if:
Your home feels very dry in winter.
You use air conditioning throughout the summer.
You want improved year-round humidity control.
Many newer Ontario homes are now equipped with ERVs because they perform well across all seasons, although HRVs remain extremely common and effective.
Why Maintenance Matters
Whether you have an HRV or an ERV, regular maintenance is essential for proper operation.
Homeowners should:
Clean or replace filters every 1–3 months
Clean the recovery core once or twice per year (per manufacturer instructions)
Keep exterior intake and exhaust hoods free of leaves, snow, ice, and debris
Check the condensate drain (if equipped)
Schedule professional servicing annually
Neglecting maintenance can lead to:
Reduced airflow
Higher heating and cooling costs
Poor indoor air quality
Excess humidity or overly dry indoor air
Window condensation
Mold growth
Premature fan motor failure
What Home Inspectors Look For
During a home inspection, your inspector may evaluate:
Visible condition of the HRV or ERV
Installation quality
Filter condition
Exterior intake and exhaust hoods
Condensate drain (if visible)
Visible duct connections
General operation (where accessible)
A home inspection is a visual, non-invasive inspection and does not include balancing or performance testing of the ventilation system. If concerns are identified, further evaluation by a qualified HVAC contractor may be recommended.
Signs Your Ventilation System May Need Attention
Watch for these common signs:
Excessive window condensation
Persistent indoor humidity
Stale or stuffy air
Musty odors
Unusual noises from the unit
Ice buildup around exterior vents in winter
Poor airflow at supply or exhaust grilles
If you notice any of these symptoms, it's a good idea to have the system inspected and serviced.
Final Thoughts
An HRV or ERV is one of the most important yet often overlooked systems in a modern home. These units help improve indoor air quality, manage humidity, and reduce energy loss by providing continuous fresh air.
Understanding which system your home has—and maintaining it regularly—can improve comfort, protect your home from moisture-related issues, and help extend the life of your HVAC equipment.
If you're purchasing a home, make sure the ventilation system is included as part of your home inspection so you understand its condition and maintenance requirements before you move in.
Need a Home Inspection in Ottawa?
At Maskan Home Inspection Services, we inspect the visible components of your home's ventilation system as part of a comprehensive home inspection. We'll help you understand how your HRV or ERV works, identify any visible concerns, and provide practical maintenance recommendations to keep your home healthy and efficient.