Passive‑house testimony: presenter urges Vermont to adopt performance‑based energy targets for new buildings

Enrique Bueno, testifying for a Passive House advocacy organization, told the House Energy and Digital Infrastructure Committee that adopting a performance‑based standard aligned with Passive House certification for new multifamily construction would reduce building energy use, lower greenhouse‑gas emissions and make statewide electrification and renewable integration more affordable.

Bueno said an Efficiency Vermont study comparing six Efficiency Vermont high‑performance multifamily projects with four Passive House certified projects found the Passive House buildings delivered notably lower and more consistent energy‑use intensity (EUI) and relied far less on fossil fuels. He told the committee that Passive House design — tight envelopes, continuous insulation, triple‑pane windows appropriate to Vermont’s cold climate and balanced energy‑recovery ventilation — reduces winter heating peaks, lowering the need for generation and storage when the state electrifies heating.

Why it matters: committee members heard that buildings represent a large share of Vermont’s greenhouse‑gas footprint and energy demand, and that lowering thermal load profiles in new construction would reduce the overall need for new electricity generation and storage as the state moves toward electrification of heating and transportation.

Key points from the presentation - Performance versus prescriptive codes: Bueno said prescriptive standards (the typical code boxes specifying particular construction assemblies) can produce widely varying outcomes. Passive House uses an energy model and a targeted annual energy budget for the building; that performance‑based approach, the witness said, yields more predictable results and allows designers to trade components to reach the target cost‑effectively. - Energy and grid effects: By “flattening” peak demand and reducing total heating loads, Passive House buildings require less generation capacity and storage growth to support electrification, the witness said. Bueno cited Burlington as an example: replacing gas‑supplied thermal loads with electricity would roughly triple Burlington Electric Department’s current net supply needs if thermal loads were not reduced. - Costs and incentives: Bueno said the incremental construction cost to reach Passive House performance averaged roughly 22.7 percent in the projects he reviewed but argued lifecycle savings, smaller mechanical equipment and reduced maintenance offset that increment. He urged targeted incentives and code‑level performance requirements for multifamily construction to capture those benefits. - Demonstrations and mandates elsewhere: Several Massachusetts municipalities have adopted Passive House or equivalent performance thresholds for larger buildings; proponents told the committee that local mandates reduce city verification burden because Passive House certification involves independent modeling and onsite verification. - Weatherization gap: Bueno warned Vermont is far behind the weatherization pace the witness said is needed to meet state climate goals; he urged higher standards for new construction so newly built stock does not increase the long‑term retrofit burden.

Questions from the committee focused on implementation details: how energy‑recovery ventilators and heat‑recovery systems work in summer and winter, how ventilation rates are sized per occupant and how Passive House certification would integrate with existing state codes. Bueno said retrofit pathways exist and while orientation and site constraints can affect solar gains, performance targets can still be met through tradeoffs in insulation, window performance and mechanical sizing.

Quotes from the hearing "Simplicity is the way to go," Enrique Bueno said, arguing that Passive House’s focus on a tight envelope and balanced ventilation produces healthier, lower‑energy buildings.

Ending: Committee members thanked Bueno for the detailed presentation and several asked staff to consider whether a performance‑based energy target for multifamily construction — or an incentive package to encourage Passive House certification — should be included in future code updates or bills. No vote or formal policy decision was taken at the hearing.