Step 1 - HRV or ERV?
Before diving into models, it’s crucial to understand how HRVs and ERVs differ and how they function:
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In climates with cold winters and dry summers, an HRV may be preferable, since there’s less need to manage moisture transfer.
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In regions with humid summers and variable winters, an ERV often offers better comfort and energy efficiency—but ensure the ERV is rated for cold climates if your area experiences very low temperatures.
Many homes in mixed climates may work with either system; the moisture control advantage often gives ERVs an edge in such cases.
Step 2 - Match to Home Size & Layout
The dimensions and design of your home directly affect what ventilation capacity you require.
Calculating Ventilation Requirements:
A common guideline is to aim for 0.35 Air Changes per Hour (ACH). Multiply your home’s square footage by ceiling height to get total cubic volume, then use that to determine how much air (in cubic feet) needs to be exchanged per hour, and finally convert that to CFM (cubic feet per minute).
Example: A 2,000 ft² home with 8 ft ceilings equals 16,000 ft³ of air. At 0.35 ACH, you need 5,600 ft³ exchanged per hour. Dividing by 60 gives ~93 CFM required.
Use a CFM calculator to find your required size, then choose an HRV or ERV that meets or exceeds it
—An HVAC professional can confirm the right fit.
Step 3 - Account for Local Climate & Humidity
Your regional weather conditions influence your choice:
Harsh, cold winters: An HRV is often more effective in retaining heat and managing ventilation.
Humid summers or seasonal moisture: An ERV may be more beneficial by controlling humidity.
Mixed climates: Both HRV and ERV can work; the moisture handling of an ERV often gives it an advantage.
If you live somewhere that sees both extremes, an ERV with cold-climate certification can be a smart choice, giving you heat recovery plus moisture balance through the entire year.
Step 4 - Review Installation & Ductwork Options
Your home’s physical layout affects how your system is integrated:
Existing duct system: If you already have ductwork, your Auroris unit can often tie in or be ducted in separately.
No ductwork: Expect to install new ducting—this affects cost and planning.
Placement & clearance: Common locations include basements, attics, mechanical rooms, or utility spaces. Ensure enough space for both the unit and airflow paths.
Balanced setup: Correct installation and airflow balancing are key. Hiring a qualified installer is strongly recommended.
