HVAC / Mechanical Engineering Design
Comfort, Efficiency &
Code Compliance
From load calculations to construction documents, our ASHRAE Certified HVAC Designer (CHD) delivers full mechanical packages for residential, commercial, and industrial facilities across a wide range of scales. Systems are sized for real occupancy and climate conditions and documented to the applicable IMC, IECC, ASHRAE standards (62.1, 90.1), and local requirements. Engineered for rigorous review, coordinated across disciplines, and prepared to support a clean plan-check submission.
HVAC System Design
We design high-performance HVAC systems tailored to your building’s occupancy, climate, and energy goals — supporting year-round comfort, documented code compliance, and long-term operational efficiency for the project types we serve.
- Heating, ventilation & air conditioning system design
- Load calculations, duct sizing & equipment selection
- VRF, packaged & split DX, hydronic & water-source heat pump systems
- Ventilation & outside-air design per the adopted mechanical code and ASHRAE 62.1, with ASHRAE 62.2 for nontransient dwelling units
- Mechanical room, shaft & rooftop unit placement
- Dedicated outdoor air systems (DOAS) & energy recovery
HVAC Upgrades & Replacements
Aging HVAC equipment reduces comfort and increases operating costs. CoreX evaluates existing-condition drawings and data you provide and delivers practical upgrade designs intended to improve system performance and extend building infrastructure life.
- Chiller, boiler & AHU replacement design
- Cooling tower & chilled water riser upgrades
- Fan coil unit & VAV system redesign
- Controls & building automation integration
- Performance review of existing HVAC infrastructure from client-supplied data
Central Plant Design
CoreX provides expert central plant engineering for buildings requiring dedicated heating and cooling infrastructure — delivering efficient, reliable, and code-compliant boiler and chiller plant solutions for new construction and major renovations.
- Boiler plant & chiller plant engineering
- Fuel & gas conversion design
- Condenser water & cooling tower coordination
- Central plant capacity & redundancy planning
- Compliance with IMC & local mechanical codes
Energy Modeling & Compliance
Our energy modeling services integrate sustainability into the design process from day one — optimizing system selection, reducing lifecycle costs, and documenting compliance with the applicable energy code and green building certification requirements.
- IECC, ASHRAE 90.1 & California Title 24, Part 6 energy-compliance documentation — prescriptive, envelope trade-off, or performance path (IECC C407 or R405 / ASHRAE 90.1 Appendix G)
- Building energy simulation & load analysis
- LEED & sustainable design support
- System optimization for energy cost reduction
- Peak load analysis & equipment right-sizing
Independent Review & Construction Support
Beyond design, CoreX brings independent review and construction-phase support to your projects — peer review of mechanical documents, plan review support for city projects, and construction-administration support that helps keep designs accurate, code-compliant, and buildable from permit through construction.
- Peer review of HVAC / mechanical design documents
- Plan review support for city projects
- Construction administration support (RFIs, submittals & shop-drawing review)
- Code compliance and constructability review
- Value engineering & cost-reduction review
- Plan-check comment responses and resubmittal sets, prepared for your engineer of record to issue
For municipal plan-review work, CoreX supports a jurisdiction-authorized reviewer holding the required credential — such as an ICC-certified Mechanical Plans Examiner or a licensed PE — who issues the official determination.
Architectural floor plans (CAD or Revit), the building’s use and occupancy, project location, and any owner or jurisdiction requirements. We reply within one business day. From there we agree on scope, deliverables, and milestones and begin with load calculations and system selection.
Yes. We run detailed block and room-by-room heating and cooling loads using Carrier HAP or Trane TRACE 3D Plus for commercial loads and an ACCA Manual J tool (Elite RHVAC) for residential loads, with residential equipment and ductwork sized per Manual S and Manual D — so equipment is selected from documented load calculations rather than rule-of-thumb sizing. For full-design scopes, calculation reports are included in the agreed project deliverables.
Common commercial and residential systems, including packaged rooftop units, DX splits, VRF/VRV, hydronic boiler and chiller plants, water-source heat pumps, and dedicated outdoor air systems. We recommend the system that best fits your building’s loads, energy goals, and budget — and explain why.
Energy compliance is built into the design, not bolted on at the end. We document IECC or ASHRAE 90.1 compliance, as adopted, on whichever path the project takes — COMcheck (REScheck for low-rise residential) reports where the jurisdiction accepts them, for the prescriptive and envelope trade-off paths, or whole-building energy modeling for the performance path (IECC C407 or R405 / ASHRAE 90.1 Appendix G) — plus Title 24 Part 6 documented in CEC-approved compliance software where the performance approach is used, on the required CF1R (single-family), NRCC (nonresidential), or applicable multifamily forms for California projects. We also support LEED and green building documentation when your project requires it.
Yes. Many of our clients are consulting firms and architects who bring us in for overflow or full-scope mechanical work. We produce to your templates, title blocks, and standards so the set reads as your own, and we coordinate directly with your project leads throughout.
CoreX works as a design support partner: we prepare the complete load calculations and construction documents under the direction of the project's licensed Engineer of Record, who retains responsibility for reviewing, sealing and issuing the final set, while your team controls the project scope and client relationship and CoreX carries the agreed production load.
Mechanical never stands alone. We model in BIM alongside electrical, plumbing, and structure, resolving conflicts in equipment placement, duct and pipe routing, and clearances while the design is still on screen — to help identify coordination issues before they become field RFIs.
Yes — we draft responses to mechanical RFIs, review submittals and shop drawings against the design intent, and prepare clarification sketches and revisions for your engineer of record to issue as construction progresses.