Senior Building Performance Engineer Job (Lancaster, PA, US, 17603)

Armstrong World Industries, Inc.•Lancaster, PA

36d•Remote

About The Position

As the Sr. Building Performance Engineer you will lead Armstrong's building-energy modeling program to quantify and communicate the performance impact of our energy-efficient products and accelerate their adoption in U.S. commercial buildings. You'll work primarily in IESVE (ModelIT, Apache/ApacheHVAC, VistaPro; VE Navigators for ASHRAE 90.1/LEED/Title 24) to consult on projects and deliver code-compliance, LEED, and owner-option analyses comparing designs using Armstrong solutions to baseline cases. Core focus areas include assessing Templok PCM ceiling tiles (and future products) for new construction and renovations; quantifying cost/benefit; and recommending design and operational strategies using the Templok model in IESVE 2025. You will also run calibrated simulations to support M&V, translate findings into reports and technical marketing content, and educate the market via webinars and conference sessions. The role blends technical sales, building-energy modeling expertise, and cross-functional collaboration to shape Armstrong's energy-solutions portfolio and accelerate market adoption with clear, defensible modeling evidence.

Requirements

B.S. in Mechanical or Architectural Engineering (or related fields; M.S. preferred).
10+ years as a practicing building energy modeler with commercial HVAC sizing/design responsibility.
Proven delivery of ASHRAE 90.1/IECC/Title 24 compliance and LEED v4/v4.1 EA modeling through full submittal/review cycles.
Advanced Excel and PowerPoint.
Deep knowledge of building physics, HVAC systems, and energy modeling with rigorous QA/QC (baselines, schedules, internal loads, envelope/infiltration, unmet hours).
Skilled in uncertainty/sensitivity analysis; able to defend assumptions to customer engineering teams, reviewers, and utilities.
Clear communicator; translates complex simulations into actionable recommendations for technical and executive audiences.
Strong analytical/problem-solving skills and a collaborative, team-first mindset.
Self-starter comfortable operating in a start-up-style environment within a large enterprise.

Nice To Haves

IESVE expert (required); familiarity with EnergyPlus/OpenStudio/eQUEST
ASHRAE BEMP strongly preferred, PE a plus.
LEED AP desirable; CEM/HBDP
Advanced in Python or other scripting languages
M.S in Mechanical, Architectural Engineering or a similar discipline.

Responsibilities

Partners with A/E firms and ESCOs from concept modeling through high-fidelity IESVE simulations to analyze design options and quantify financial cases to incorporate Armstrong products in building energy designs.
Quantifies annual energy/cost impacts, peak-load reduction, sizing changes, and first-cost trade-offs for Templok and new solutions.
Performs load calculations; support system selection and sizing (coils, fans, pumps) and psychrometrics; draft BAS sequences to leverage Templok within ASHRAE 55 comfort guidelines.
Supports code-compliance modeling and submittals (ASHRAE 90.1 PRM/Appendix G, IECC, Title 24) and LEED EA documentation leveraging Armstrong products on customer projects.
Builds early-phase screening tools and VE scripts/post-processing to accelerate building performance evaluations and highlight the contributions of Armstrong solutions.
Leads IESVE studies across building types and climates; define scenarios and present results and recommendations to technical and executive audiences.
Performs calibrated simulations (ASHRAE Guideline 14/IPMVP) for real projects; write concise M&V reports and case studies; present results to technical and non-technical audiences.
Translates results into clear value propositions/metrics for the customer: peak reduction, hours-of-exceedance, PMV/PPD, economics (payback, LCCA), etc.
Contributes to grid-interactive, load-shifting, and demand/cost analyses where applicable.
Leverages IESVE simulations and project experience to inform product roadmap.
Establishes QA/QC checklists, acceptance criteria, and reference VE files to ensure reproducibility of modeling results.
Develops a library of IESVE simulation results and parametric runs as quick-lookup reference cases to inform product performance estimates across building/climate scenarios.
Develops rough-order performance tools calibrated to VE results and first-principles heat-transfer methods for early-phase estimation and sales enablement.
Maintains current knowledge of ASHRAE 55/62.1/90.1, Standard 140, IECC, Title 24, LEED and regional programs.
Mentors junior modelers; perform formal peer reviews; deliver internal trainings on VE workflows, QA/QC, and documentation standards.

Benefits

A benefits package including: medical, dental, prescription drug, life insurance, 401k match, long-term disability coverage, vacation and sick time, product discount programs and many more.
Personal development to grow your career with us based on your strengths and interests.
A casual work environment where we have a recognition program for our team, and service awards. You will also be able to make the most of our fitness center and lunchtime cafe.
A working culture that balances individual achievement with teamwork and collaboration. We draw on each other's strengths and allow for different work styles to build engagement and satisfaction to deliver results.

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