HVAC Retrofit Engineering in Florissant, MO
Florissant is a developed north St. Louis County suburb with established commercial districts and industrial corridors, including aerospace supplier facilities and regional manufacturing that drive ongoing MEP and facility upgrade work.
49 states · 10+ PEs · Same-day quotes on qualifying scopes · Zero excuses
What we engineer
Heat-pump and VRF/VRV conversions replacing gas and aging electric systems; dedicated outdoor air systems (DOAS) with energy recovery for humidity control; chiller and boiler plant retrofits; pneumatic-to-DDC controls upgrades; and refrigerant transitions off high-GWP HFCs per the AIM Act phasedown — full mechanical design with load calculations per ACCA Manual N / ASHRAE, ventilation per ASHRAE 62.1, and energy compliance per ASHRAE 90.1 and IECC.
Compliance & incentive stacking
NYC Local Law 97, Boston BERDO, Denver Energize Denver, Washington's Clean Buildings Performance Standard, Maryland BEPS, St. Louis BEPS — we engineer the HVAC retrofits that hit building performance standard targets, and we stack utility rebates (ComEd, Xcel, Mass Save, NYS Clean Heat, Energy Trust of Oregon, Efficiency Maine, Focus on Energy) to cut net project cost.
Backed by licensed PEs
All HVAC retrofit engineering is backed by Apex Grid Engineering: 10+ PEs licensed across 49 states, 20+ engineers, 15+ years of plan sets that pass plan check.
Project types
- Commercial office & retail
- Healthcare & medical facilities
- Institutional & civic
Everything else your project needs
MEP Engineering in Florissant
Mechanical, electrical & plumbing design — permit-ready drawings, best price.
Structural Engineering in Florissant
Structural design, analysis & PE stamping — permit-ready drawings, best price.
Civil Engineering in Florissant
Site civil & land development — permit-ready drawings, best price.
Electrical Engineering in Florissant
Power distribution, panels & lighting design — permit-ready drawings, best price.
Plumbing Engineering in Florissant
Water, sewer, gas & fixture design — permit-ready drawings, best price.
HVAC Engineering in Florissant
Heating, cooling, ventilation & ductwork — permit-ready drawings, best price.
PE Stamping in Florissant
Licensed PE stamps on your plans — fast turnaround, best price.
Structural Stamping in Florissant
Licensed PE stamps on structural plans & calculations — fast turnaround, best price.
MEP Stamping in Florissant
Licensed PE stamps on MEP plan sets — fast turnaround, best price.
Civil Stamping in Florissant
Licensed PE stamps on civil & site plans — fast turnaround, best price.
Fire Protection Engineering in Florissant
Fire sprinkler, alarm & suppression design — permit-ready drawings, best price.
Plan Check Corrections in Florissant
Plan check comments answered fast — resubmittal-ready corrections, best price.
Energy Modeling & Compliance in Florissant
Title 24, COMcheck & ASHRAE 90.1 compliance — pass plan check, best price.
Tenant Improvement Engineering in Florissant
TI engineering for office, retail & restaurant buildouts — permit-ready, best price.
Low Voltage Engineering in Florissant
Fire alarm, data, security & AV design — permit-ready drawings, best price.
Seismic Retrofit Engineering in Florissant
Earthquake retrofit design & PE-stamped plans — best price.
Solar Engineering in Florissant
PV structural analysis, NEC 690 electrical design & interconnection — permit-ready drawings, best price.
Fire Alarm Engineering in Florissant
NFPA 72 fire alarm design, voice evacuation & mass notification — permit-ready drawings, best price.
Security System Engineering in Florissant
Access control, video surveillance & intrusion detection design — permit-ready drawings, best price.
Building Automation Engineering in Florissant
BACnet controls, BMS design & smart building integration — permit-ready drawings, best price.
Elevator Engineering in Florissant
ASME A17.1 elevator design, modernization & code compliance — permit-ready drawings, best price.
Industrial Electrical Engineering in Florissant
NEC Article 430 industrial power design, arc flash & hazardous locations — permit-ready drawings, best price.
Plumbing Design Engineering in Florissant
IPC/UPC plumbing design, medical gas & backflow engineering — permit-ready drawings, best price.
Electrical Panel Upgrade Engineering in Florissant
Panel upgrades, load calculations & utility coordination — permit-ready drawings, best price.
Emergency Power Engineering in Florissant
Generators, NFPA 110 systems & life-safety power design — permit-ready drawings, best price.
Renewable Energy Engineering in Florissant
Wind, geothermal & hybrid renewable engineering — feasibility, PE-stamped design & interconnection, best price.
Energy Audit Engineering in Florissant
ASHRAE Level 1/2/3 energy audits, benchmarking & retro-commissioning — find the waste, prove the savings, best price.
EV Charging Engineering in Florissant
EV charging station design — NEC 625, load calculations & service upgrades, permit-ready drawings, best price.
Water Treatment Engineering in Florissant
Filtration, disinfection, reverse osmosis & backflow design — permit-ready water engineering, best price.
Battery Storage Engineering in Florissant
Battery storage design per NEC 706 & NFPA 855 — permit-ready drawings, best price.
Commissioning Engineering in Florissant
Building commissioning & functional testing — systems verified to work as designed, best price.
Data Center Engineering in Florissant
Mission-critical MEP for data centers — Tier III/IV electrical, cooling & fire protection, best price.
Generator Engineering in Florissant
Standby generator sizing, ATS & emergency power design — permit-ready drawings, best price.
Lighting Design Engineering in Florissant
Photometric lighting design, controls & code compliance — permit-ready drawings, best price.
Medical Facility Engineering in Florissant
Medical gas, exam-room HVAC & healthcare electrical design — permit-ready drawings, best price.
Commercial Kitchen Engineering in Florissant
Commercial kitchen hoods, grease exhaust, gas & interceptors — permit-ready drawings, best price.
Pool Engineering in Florissant
Pool structural, systems & permits — engineered for plan check approval.
ADU Design in Florissant
Accessory dwelling unit plans — from concept to permit.
Engineering Cost Guide in Florissant
Straight answers on what engineering really costs.
HVAC Retrofit Engineering nearby
Ballwin · Blue Springs · Cape Girardeau · Chesterfield · Clayton · Columbia · Hazelwood · Independence · Jefferson City · Joplin · Kansas City · Lee's Summit