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Heat Recovery Ventilator Savings Calculator

Estimate the heating cost savings from installing a heat recovery ventilator (HRV) instead of using standard exhaust ventilation.

Result

Estimated Annual Savings
$210
Estimated Ventilation Heat Loss Cost
$300

Assumes mechanical ventilation (bringing in fresh outside air while exhausting stale indoor air) accounts for roughly a quarter of a well-sealed home's heating load - an HRV recovers a share of the heat from outgoing air and transfers it to incoming fresh air, unlike a simple exhaust fan that discards that heat entirely.

About the HRV Savings

This calculator estimates the heating cost savings from installing a heat recovery ventilator (HRV) or energy recovery ventilator (ERV) in place of a standard exhaust-only ventilation setup. It's aimed at homeowners in tightly sealed, energy-efficient homes who need mechanical fresh-air ventilation and want to see the dollar value of recovering heat from the outgoing air instead of discarding it.

How It Works

You enter your home's total annual heating cost and the heat recovery efficiency of the HRV/ERV unit you're considering. The calculator assumes mechanical ventilation accounts for a fixed share of total heating cost, then applies the recovery efficiency to that ventilation-related portion to estimate how much of it an HRV would save.

Ventilation Cost = Annual Heating Cost x 0.25; Estimated Savings = Ventilation Cost x Heat Recovery Efficiency (as a decimal).

Formula & Methodology

The model assumes that in a well-sealed home, roughly 25% of total heating cost goes toward warming the fresh outside air brought in for ventilation (replacing stale indoor air that's exhausted). An HRV or ERV captures a share of the heat in that outgoing air, set by its recovery efficiency, typically 60-85% for modern units, and transfers it to the incoming fresh air before it needs to be heated from scratch. Multiplying the ventilation-cost share by that recovery efficiency gives the estimated annual dollar savings versus a plain exhaust fan that vents all of that heat outside unrecovered.

Examples

Mid-efficiency HRV

A home with $1,200 in annual heating costs and an HRV rated at 70% recovery efficiency has an estimated ventilation cost of $300 (25% of $1,200), and recovers 70% of that, saving about $210 per year.

High-efficiency ERV in a costlier climate

A home spending $2,000 annually on heating with an ERV rated at 85% recovery efficiency has a $500 ventilation cost share, saving about $425 per year at that higher recovery rate.

Advantages

  • Translates an abstract percentage (recovery efficiency) into a concrete annual dollar figure tied to the reader's actual heating bill.
  • Makes clear that HRV savings are bounded by the size of the ventilation-related heat loss, not the entire heating bill, avoiding an inflated impression of impact.
  • Useful for comparing HRV/ERV units of different rated efficiencies against each other before purchase.
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Common Mistakes

  • Assuming the full annual heating cost is at stake, when only the ventilation-related 25% share is affected by an HRV upgrade.
  • Using a marketing-quoted peak efficiency rating rather than a more typical field-tested efficiency, which can overstate real-world savings.
  • Forgetting that the estimate doesn't subtract the HRV unit's own fan electricity use, so actual net savings will be somewhat lower than the figure shown.

Edge Cases to Watch For

  • The 25% ventilation cost share is a fixed assumption built into the calculator, not something the user can adjust, so homes with unusually loose or unusually tight envelopes will see this assumption apply less accurately.
  • A 0% recovery efficiency (equivalent to a standard exhaust fan with no heat recovery) returns zero savings, correctly reflecting that plain exhaust ventilation discards ventilation heat entirely.
  • The calculator does not account for the HRV/ERV unit's own electricity consumption (running its fans), so the reported savings is a gross heating-cost figure, not a net savings after equipment operating cost.

Common Use Cases

  • Homeowners building or retrofitting a tightly sealed, energy-efficient house who need mechanical ventilation.
  • Buyers comparing HRV versus ERV units by their rated heat recovery efficiency.
  • Contractors or energy auditors giving clients a rough dollar estimate of ventilation heat-recovery value.
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

Why would a well-sealed, energy-efficient home need mechanical ventilation at all?

Modern energy-efficient homes are built tightly to minimize uncontrolled air leaks, but people still need fresh outside air for indoor air quality - rather than relying on random leaks (which waste heat unpredictably and provide inconsistent ventilation), an HRV brings in a controlled, filtered supply of fresh air while recovering most of the heat that would otherwise be lost, combining good air quality with energy efficiency.

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Conclusion

This calculator shows that an HRV's value comes from recovering heat within a specific slice of a home's total heating cost, the portion tied to ventilation air exchange, rather than affecting the whole bill. It offers a useful order-of-magnitude estimate for weighing HRV or ERV installation against a standard exhaust fan.