HVAC Retrofit Engineering in Appleton, WI
Appleton anchors the Fox Cities — a paper-industry and manufacturing region on the Fox River — with Lawrence University, a strong healthcare sector, and steady suburban growth.
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
- Paper and converting plants
- Healthcare campus expansion
- Downtown College Avenue mixed-use
- Highway 41 corridor commercial
- University facilities
- Suburban multifamily
Everything else your project needs
MEP Engineering in Appleton
Mechanical, electrical & plumbing design — permit-ready drawings, best price.
Structural Engineering in Appleton
Structural design, analysis & PE stamping — permit-ready drawings, best price.
Civil Engineering in Appleton
Site civil & land development — permit-ready drawings, best price.
Electrical Engineering in Appleton
Power distribution, panels & lighting design — permit-ready drawings, best price.
Plumbing Engineering in Appleton
Water, sewer, gas & fixture design — permit-ready drawings, best price.
HVAC Engineering in Appleton
Heating, cooling, ventilation & ductwork — permit-ready drawings, best price.
PE Stamping in Appleton
Licensed PE stamps on your plans — fast turnaround, best price.
Structural Stamping in Appleton
Licensed PE stamps on structural plans & calculations — fast turnaround, best price.
MEP Stamping in Appleton
Licensed PE stamps on MEP plan sets — fast turnaround, best price.
Civil Stamping in Appleton
Licensed PE stamps on civil & site plans — fast turnaround, best price.
Fire Protection Engineering in Appleton
Fire sprinkler, alarm & suppression design — permit-ready drawings, best price.
Plan Check Corrections in Appleton
Plan check comments answered fast — resubmittal-ready corrections, best price.
Energy Modeling & Compliance in Appleton
Title 24, COMcheck & ASHRAE 90.1 compliance — pass plan check, best price.
Tenant Improvement Engineering in Appleton
TI engineering for office, retail & restaurant buildouts — permit-ready, best price.
Low Voltage Engineering in Appleton
Fire alarm, data, security & AV design — permit-ready drawings, best price.
Seismic Retrofit Engineering in Appleton
Earthquake retrofit design & PE-stamped plans — best price.
Solar Engineering in Appleton
PV structural analysis, NEC 690 electrical design & interconnection — permit-ready drawings, best price.
Fire Alarm Engineering in Appleton
NFPA 72 fire alarm design, voice evacuation & mass notification — permit-ready drawings, best price.
Security System Engineering in Appleton
Access control, video surveillance & intrusion detection design — permit-ready drawings, best price.
Building Automation Engineering in Appleton
BACnet controls, BMS design & smart building integration — permit-ready drawings, best price.
Elevator Engineering in Appleton
ASME A17.1 elevator design, modernization & code compliance — permit-ready drawings, best price.
Industrial Electrical Engineering in Appleton
NEC Article 430 industrial power design, arc flash & hazardous locations — permit-ready drawings, best price.
Plumbing Design Engineering in Appleton
IPC/UPC plumbing design, medical gas & backflow engineering — permit-ready drawings, best price.
Electrical Panel Upgrade Engineering in Appleton
Panel upgrades, load calculations & utility coordination — permit-ready drawings, best price.
Emergency Power Engineering in Appleton
Generators, NFPA 110 systems & life-safety power design — permit-ready drawings, best price.
Renewable Energy Engineering in Appleton
Wind, geothermal & hybrid renewable engineering — feasibility, PE-stamped design & interconnection, best price.
Energy Audit Engineering in Appleton
ASHRAE Level 1/2/3 energy audits, benchmarking & retro-commissioning — find the waste, prove the savings, best price.
EV Charging Engineering in Appleton
EV charging station design — NEC 625, load calculations & service upgrades, permit-ready drawings, best price.
Water Treatment Engineering in Appleton
Filtration, disinfection, reverse osmosis & backflow design — permit-ready water engineering, best price.
Battery Storage Engineering in Appleton
Battery storage design per NEC 706 & NFPA 855 — permit-ready drawings, best price.
Commissioning Engineering in Appleton
Building commissioning & functional testing — systems verified to work as designed, best price.
Data Center Engineering in Appleton
Mission-critical MEP for data centers — Tier III/IV electrical, cooling & fire protection, best price.
Generator Engineering in Appleton
Standby generator sizing, ATS & emergency power design — permit-ready drawings, best price.
Lighting Design Engineering in Appleton
Photometric lighting design, controls & code compliance — permit-ready drawings, best price.
Medical Facility Engineering in Appleton
Medical gas, exam-room HVAC & healthcare electrical design — permit-ready drawings, best price.
Commercial Kitchen Engineering in Appleton
Commercial kitchen hoods, grease exhaust, gas & interceptors — permit-ready drawings, best price.
Pool Engineering in Appleton
Pool structural, systems & permits — engineered for plan check approval.
ADU Design in Appleton
Accessory dwelling unit plans — from concept to permit.
Engineering Cost Guide in Appleton
Straight answers on what engineering really costs.
HVAC Retrofit Engineering nearby
Beloit · Brookfield · Caledonia · De Pere · Eau Claire · Fitchburg · Fond du Lac · Franklin · Green Bay · Greenfield · Janesville · Kenosha