Vroom Passive House

Redwood City, California
The Vroom Passive House is a single-family Passive House currently under construction in Redwood City. With energy modeling by Steve Mann and certification through CertiPHIers Cooperative, the home is targeting Passive House Plus certification with verified heating demand of 3.92 kBTU/(ft²·y) and a pressurization test target of 0.6 ACH50.
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PHPP Verification — Modeled Results

Every Passive House criterion
— met or exceeded.

The Passive House Planning Package (PHPP) is an ASHRAE-140-validated energy model. Here is the project's verification sheet, line for line.

Annual Heating Demand
3.92kBTU/ft²·y
PHI criterion: ≤ 4.75 · PASS
Heating Load
3.31BTU/h·ft²
Peak design heating load
Airtightness (n50)
0.6ACH₅₀
PHI criterion: ≤ 0.6 · PASS
Frequency of Overheating (> 77 °F)
0%
PHI criterion: ≤ 10 % · PASS
Excessively High Humidity
0.0%
PHI criterion: ≤ 20 % · PASS
Non-Renewable Primary Energy
15.66kBTU/ft²·y
PHI criterion: ≤ 19 · PASS
Primary Energy Renewable (PER)
7.33kBTU/ft²·y
PHI criterion: ≤ 19 · PASS
On-Site Renewable Generation
34.36kBTU/ft²·y
Qualifies for Passive House Plus
Project Specifications

The model inputs

Building geometry, occupancy, climate and design temperatures used in the PHPP run.

Building & Site

Project nameVroom Passive House
Building typeSingle-family residence (new construction)
Year of construction2025
Treated floor area2,837 ft²
Number of dwelling units1
Number of occupants (modeled)3.1
Interior temperature, winter68.0 °F
Interior temperature, summer77.0 °F
IHG cooling case0.73 BTU/(h·ft²)
Climate data setUS0115 — Oakland (adjusted for site elevation)
Project Team

The people behind the numbers

Owner / Client
Private client
Redwood City, CA
Architecture
2875 21st Street, Ste. 4 — San Francisco, CA
Energy Consultancy (PHPP)
Steve Mann
Berkeley, CA
Mechanical Engineering
Emrod Studio — Vlad Pasel
Somerville, MA
Passive House Certification
CertiPHIers Cooperative
Portland, OR
General Contractor
Earth Bound Homes
Bay Area, CA · Certified B Corp