HVAC Retrofit Engineering in Londonderry, NH
Londonderry is a major southern New Hampshire logistics and tech market near Manchester-Boston Regional Airport, with distribution facilities, tech manufacturing, and commercial development driving engineering demand.
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
- Distribution & warehouse facilities
- Logistics & fulfillment centers
- Data centers & server facilities
- Corporate technology campuses
Everything else your project needs
MEP Engineering in Londonderry
Mechanical, electrical & plumbing design — permit-ready drawings, best price.
Structural Engineering in Londonderry
Structural design, analysis & PE stamping — permit-ready drawings, best price.
Civil Engineering in Londonderry
Site civil & land development — permit-ready drawings, best price.
Electrical Engineering in Londonderry
Power distribution, panels & lighting design — permit-ready drawings, best price.
Plumbing Engineering in Londonderry
Water, sewer, gas & fixture design — permit-ready drawings, best price.
HVAC Engineering in Londonderry
Heating, cooling, ventilation & ductwork — permit-ready drawings, best price.
PE Stamping in Londonderry
Licensed PE stamps on your plans — fast turnaround, best price.
Structural Stamping in Londonderry
Licensed PE stamps on structural plans & calculations — fast turnaround, best price.
MEP Stamping in Londonderry
Licensed PE stamps on MEP plan sets — fast turnaround, best price.
Civil Stamping in Londonderry
Licensed PE stamps on civil & site plans — fast turnaround, best price.
Fire Protection Engineering in Londonderry
Fire sprinkler, alarm & suppression design — permit-ready drawings, best price.
Plan Check Corrections in Londonderry
Plan check comments answered fast — resubmittal-ready corrections, best price.
Energy Modeling & Compliance in Londonderry
Title 24, COMcheck & ASHRAE 90.1 compliance — pass plan check, best price.
Tenant Improvement Engineering in Londonderry
TI engineering for office, retail & restaurant buildouts — permit-ready, best price.
Low Voltage Engineering in Londonderry
Fire alarm, data, security & AV design — permit-ready drawings, best price.
Seismic Retrofit Engineering in Londonderry
Earthquake retrofit design & PE-stamped plans — best price.
Solar Engineering in Londonderry
PV structural analysis, NEC 690 electrical design & interconnection — permit-ready drawings, best price.
Fire Alarm Engineering in Londonderry
NFPA 72 fire alarm design, voice evacuation & mass notification — permit-ready drawings, best price.
Security System Engineering in Londonderry
Access control, video surveillance & intrusion detection design — permit-ready drawings, best price.
Building Automation Engineering in Londonderry
BACnet controls, BMS design & smart building integration — permit-ready drawings, best price.
Elevator Engineering in Londonderry
ASME A17.1 elevator design, modernization & code compliance — permit-ready drawings, best price.
Industrial Electrical Engineering in Londonderry
NEC Article 430 industrial power design, arc flash & hazardous locations — permit-ready drawings, best price.
Plumbing Design Engineering in Londonderry
IPC/UPC plumbing design, medical gas & backflow engineering — permit-ready drawings, best price.
Electrical Panel Upgrade Engineering in Londonderry
Panel upgrades, load calculations & utility coordination — permit-ready drawings, best price.
Emergency Power Engineering in Londonderry
Generators, NFPA 110 systems & life-safety power design — permit-ready drawings, best price.
Renewable Energy Engineering in Londonderry
Wind, geothermal & hybrid renewable engineering — feasibility, PE-stamped design & interconnection, best price.
Energy Audit Engineering in Londonderry
ASHRAE Level 1/2/3 energy audits, benchmarking & retro-commissioning — find the waste, prove the savings, best price.
EV Charging Engineering in Londonderry
EV charging station design — NEC 625, load calculations & service upgrades, permit-ready drawings, best price.
Water Treatment Engineering in Londonderry
Filtration, disinfection, reverse osmosis & backflow design — permit-ready water engineering, best price.
Battery Storage Engineering in Londonderry
Battery storage design per NEC 706 & NFPA 855 — permit-ready drawings, best price.
Commissioning Engineering in Londonderry
Building commissioning & functional testing — systems verified to work as designed, best price.
Data Center Engineering in Londonderry
Mission-critical MEP for data centers — Tier III/IV electrical, cooling & fire protection, best price.
Generator Engineering in Londonderry
Standby generator sizing, ATS & emergency power design — permit-ready drawings, best price.
Lighting Design Engineering in Londonderry
Photometric lighting design, controls & code compliance — permit-ready drawings, best price.
Medical Facility Engineering in Londonderry
Medical gas, exam-room HVAC & healthcare electrical design — permit-ready drawings, best price.
Commercial Kitchen Engineering in Londonderry
Commercial kitchen hoods, grease exhaust, gas & interceptors — permit-ready drawings, best price.
Pool Engineering in Londonderry
Pool structural, systems & permits — engineered for plan check approval.
ADU Design in Londonderry
Accessory dwelling unit plans — from concept to permit.
Engineering Cost Guide in Londonderry
Straight answers on what engineering really costs.