Full Service Energy Code Compliance – for Residential & Commercial Construction

Successful cold-climate heat pump installs begin with better design & end with final commissioning.

A Clear Path to Compliance – and Superior Building Performance

CNG delivers healthier, more efficient homes that meet the 2021 IECC and build your reputation.

We help architects, general contractors, mechanical engineers, and HVAC contractors navigate the 2021 IECC in Climate Zones 5–8 with practical, results-driven services & solutions.

Energy Code Made Simple & Strategic
We translate code into buildable, marketable upgrades—because “better is better.” Compliance becomes a selling point, not just a requirement.

Design-Phase Integration
From energy modeling (prescriptive or performance paths) to full HVAC system design (Manual J, D, S), we address compliance and comfort at the blueprint stage—reducing rework and streamlining approvals.

High-Performance HVAC & Building Science Expertise

Complete HVAC System Design
Precise load calculations and expert duct layouts ensure every room on every floor maintains even temperatures year-round, reducing homeowner climate control complaints and high utility bills. CNG achieves this by using over a decade of HVAC industry experience and far exceeding low-value boilerplate designs and reports.

Field Optimization & Technical Corrections
During inspections, we bench test and, when necessary, can adjust airflow, refrigerant charge, and controls—including heat pumps—for peak efficiency. We collaborate directly with HVAC subcontractors to fix issues before they impact comfort or compliance. The best designs mean little without quality installation and final verification.

Pass the Building Tightness Test the First Time!

Envelope Excellence
Achieve IECC air-tightness and insulation targets with integrated design tools, field QA, and attention to both duct and building envelope integrity. CNG brings over a decade of previous air-sealing & insulation contracting experience for both retrofit and new construction projects.

Building Performance Plan
We say “Begin with the End in Mind”. Develop a commissioning roadmap to ensure that all stakeholders understand the requirements for passing final performance testing and obtaining a Certificate of Occupancy (CO). CNG guides residential new construction projects from design development through final commissioning, ensuring compliance with the 2021 International Energy Conservation Code (IECC) and delivering proven building performance.

Hard to beat BIBS price and speed for building tightness & high R-values, but only when it’s installed correctly.

Bidding Support & Pre-Bid Checklist
Review contractor proposals for energy code compliance, outline material and construction requirements, and set clear expectations for rough-in and final CNG field inspections—reducing costly change orders.

Owner/Architect/Contractor (OAC) Meetings
Participate in project team meetings to address design-phase challenges and ensure alignment among owners, architects, engineers, general contractors, and subcontractors.

We get what we inspect and test (but not always what we expect).

Construction-Phase Administration Support (CA)
Provide timely, third-party quality control inspections to confirm adherence to best practices for beneficial electrification, building envelope construction, and HVAC system installation.

Deficiency Resolution Process (DRP)
Identify, document, and oversee corrective measures to resolve code or performance issues quickly and effectively.

High air-flow with low static pressures creates quiet, efficient comfort on every level of the home.

Project Coordination Support
Assist general contractors with scheduling, sequencing, RFIs, submittals, and change order management to prevent delays and rework.

Rebate Management & Quality Install Verification: We help you leverage utility incentive programs while avoiding pitfalls. We ensure HVAC and envelope work meets quality installation standards required for rebate eligibility. We provide the documentation, testing results, and verification utilities needed to approve rebates quickly. We maximize available incentives while delivering homes that perform better and cost less to operate.

Beyond Compliance — Towards Market Advantage

Support for ENERGY STAR® and NGBS — Position your projects for high-value certifications.

Performance as a Selling Point — Our high-quality reports turn testing numbers into buyer-friendly proof points.

Why Carbon Neutral Group

Independent & Code-Savvy — Trusted by permitting authorities for unbiased verification.

Proven ROI — Fewer change orders, faster approvals, better comfort, and happier clients.

A Competitive Edge — With us, compliance becomes a pathway to reputation, referrals, and repeat business all while achieving respectable profit margins.