Your engineers spent years earning their stamp. Stop spending it on duct sizing math.
Excelize models your HVAC and mechanical systems, runs the load calculations, and clash-checks them against every other trade — so your PE spends time on design decisions, not production.
The mid-career engineers you'd normally lean on aren't there.
51% of engineering firms are turning down work due to staffing shortages, and 26% are declining profitable projects outright — because there aren't enough hands. 76% of firms specifically feel that gap at the mid-career level, where duct sizing and load calculations normally get absorbed. Meanwhile, the 2026 A2L refrigerant transition raises the cost of a rushed calculation — size a system wrong for the new refrigerant, and you're looking at efficiency loss, sensor errors, or a voided manufacturer warranty. And Manual S has to match Manual J exactly; when it doesn't, that mismatch is a named, recurring source of rework industry-wide.
Source: ACEC Research Institute, 2024 & 2025
Modeling to stamping — everything in between, handled.
HVAC & Mechanical Systems Modeling
Wet and dry sprinkler systems, standpipes, fire pumps, special hazards — clean agent, foam, inert gas — and fire alarm/mass notification devices, modeled to your design intent and LOD.
Multi-Trade Coordination & Clash Detection
LOD 200 to 350 in Navisworks, checked against electrical, plumbing, and structural — so systems install clean the first time.
Design Support
Manual J/S/D load calculations, ASHRAE 90.1 energy code compliance, and A2L-aware equipment sizing — done under your engineer of record's review.
We know your PEs didn't spend years earning their stamp just to chase clash reports and redlines.
Excelize runs as your extended BIM production team — modeling, coordinating, and resolving clashes in the background, so your engineers stay on the work only they can seal.
The team behind 2,500+ projects
Three steps. Zero PE hours lost.
No long onboarding, no process overhaul. Send a real project and see how it works — your first coordinated model sample is free.
Send us a project
A riser diagram, reflected ceiling plan, or even a sketch — whatever you have is enough to start.
We model & coordinate
Modeled to your design intent, then coordinated against structural, mechanical, and electrical.
Your PE reviews & stamps
Design intent and the stamp stay with your PE — we handle everything before that.
Free sample turnaround: 2–3 days · No cost · No contract
The barrier isn't demand. It's engineering capacity.
Mechanical engineering firms run on a resource that can't scale on demand: PE (Mechanical) licensed engineers who've earned the right to size a system and stamp it. Every project needs the same core production work behind that stamp — load calculations (Manual J), equipment selection (Manual S), duct design (Manual D), and increasingly ASHRAE 90.1 energy code compliance and A2L-aware sizing for the 2026 refrigerant transition.
None of it requires a PE license to perform — only to review and seal — but it consumes the hours of the people who hold one.
Excelize takes over the modeling, coordination, and calculation work specifically, so the licensed time a firm has goes toward the design decisions only a PE can make.
Heat Pump & Electrification Market
Industry coverage is explicit: the barrier to that deployment is engineering capacity, not demand.
Real challenge. Real coordination. Real relief.
How a fire alarm design firm keeps its engineers on engineering — not production.
Licensed engineers stuck re-running duct sizing and load calcs instead of design
Excelize took over discipline modeling and multi-trade coordination — sprinkler, standpipe, fire pump, and fire alarm systems — delivering clash-resolved models ready for PE review.
“Excelize runs the models and the math. Our engineers make the decisions — that's the work only they can stamp.” — Dallas, TX-based mechanical engineering firm
A Class A office tower — 32 stories, coordinated clean.
A 32-story Class A office tower — full mechanical package with VAV air distribution and chilled water risers modeled at LOD 400, coordinated against post-tensioned slabs and electrical distribution across 420,000 sq ft of conditioned area.
Their PEs stayed on design decisions. Excelize handled the duct routing, riser coordination, and clash resolution — not a single field RFI on mechanical.
Featured client
Fire Protection Engineering Firm
Ongoing BIM Production Partner
Dallas, TX — USAHow it works — whichever fits your workload.
Two simple ways to engage. No process overhaul, no long-term lock-in — pick what matches how your projects flow.
Time and Material
On-demand capacity. No fixed overhead. You pay only for what you use, project by project.
Best for variable project volumes Talk to us →Dedicated Resource Center
Your exclusive team embedded in your workflow — learns your standards and scales with your pipeline.
Best for steady, ongoing volume Start with a Free Sample →Frequently asked questions
Get your next project
coordinated — free.
Get a Free Mechanical BIM Sample — modeled to your standard, no cost, no obligation. Your files and your IP stay yours.
- No contract
- No obligation
- Your files and your IP stay yours