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Technical guides, product reviews, code updates, and industry news for installers, EPCs, and project managers
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Commercial HVAC Refrigerant Compliance for Facility Managers: 40 CFR Part 82, Leak Repair Thresholds, and Penalty Avo...
A facility manager's operating manual for EPA Section 608 compliance -- recordkeeping, leak-repair triggers, and the audit trail...
HVAC Service Tools Brand Selector: Fieldpiece vs Testo vs Fluke Digital Manifolds, Gauges, and Leak Detectors
Which digital-manifold ecosystem earns its price, which brand your senior techs will actually use, and how to standardize...
Refrigerant Recovery Equipment Buying Guide: Bacharach vs CPS vs Fieldpiece vs Yellow Jacket vs Appion
Which recovery machine actually pays for itself, which is A2L-ready for R-454B, and how to think about recovery-machine...
PES Refrigerant Subscription Program: Recurring Pallet Delivery for HVAC Contractors
Quarterly pallet delivery, locked contractor pricing, priority hazmat routing, and cash-flow-friendly cylinder deposits.
EPA 608 Certification Guide: Type I, II, III, and Universal Testing Paths for HVAC Contractors
Which cert type your techs actually need, how to test, what it costs, and how to think about...
R-454B Transition Guide for HVAC Contractors: 2025 AIM Act, R-410A Phasedown, and Equipment Retrofits
The A2L refrigerant reshaping residential and light commercial HVAC -- what changes on your service truck, in your...
HVAC Contractor Refrigerant Buying Guide: R-410A, R-134a, R-22 Bulk Pricing & Hazmat Shipping
EPA 608 cert gate, DOT hazmat routing, and pallet-tier contractor pricing for the four refrigerants that actually still...
EPA Section 608 Certification: Complete Study Guide (Type I, II, III & Universal)
Free EPA 608 certification study guide. Type I, II, III, and Universal exam prep, 22 practice questions, refrigerant...
R-410A Phase-Down 2026: What HVAC Contractors Need to Know
Last updated: August 2026. This guide is for HVAC contractors, mechanical engineers, and refrigerant buyers working through the...
N-Type vs TOPCon vs HJT Solar Panels: Which Technology Is Best in 2026?
Last Updated: August 2026 • Solar Cell Technology Comparison for Installers, EPCs & Commercial Buyers The solar panel...
How Many Solar Panels Do I Need for 10,000 kWh Per Month? - The Complete 2026 Guide
Need 10,000 kWh per month from solar? This complete 2026 guide from Portlandia Electric Supply breaks down the...
Solar + Battery Storage: The Complete 2026 Guide for Homeowners
Last Updated: August 2026 • Home Solar, Battery Backup & Energy Independence Guide Residential solar has changed. A...
ITC Safe Harbor & Commence-Construction: What Solar Buyers Must Lock Before the Residential Credit Sunset
The rules governing federal solar tax credits changed more between July 2025 and July 2026 than in the...
Section 232 Solar Tariffs & Minimum Import Prices: The December 4, 2026 Deadline — What Module, Cell & Polysilicon Bu...
Introduction: A 120-Day Countdown Begins Axitec AU12641 400W MBT Solar Panel - AC-400MH/108V$157.98 View Rec Solar TwinPeak 2S...
How to Size Circuit Breakers: NEC 125% Rule (2026)
Learn how to size circuit breakers correctly with the NEC 125% rule. Step-by-step calculator for safe, compliant breaker...
Solar Module Sourcing in 2026: Regional Costs, Tariff Stacking, and the Domestic Content Math
Where solar modules are made in 2026, what they actually cost by region, how tariffs stack, and when...
Module Prices Hit $0.34/W — So Why Did Your Commercial Quote Go Up?
Solar module prices dropped to $0.34/W in Q1 2026, but commercial system prices rose 4%. The real story...
The Safe Harbor Deadline Passed. Here's What Actually Happened.
The July 4, 2026 safe harbor deadline for full ITC has passed. We break down what developers got...
Section 232 Polysilicon Tariffs Hit Solar: What August 2026 Means for Your Inventory
New Section 232 tariffs on solar-grade polysilicon took effect August 6. We break down what this means for...
Generac Generator Warranty Explained: 5, 7, and 10-Year Extended Coverage
🇺🇸/🇲🇽 Versión en español → Generac sells more residential standby generators than every competitor combined, which means contractors...
Whole Home Generator Sizing Guide 2026: How Many kW Do You Actually Need?
🇺🇸/🇲🇽 Versión en español → The most common question we hear from contractors and homeowners alike is deceptively...
Battery Storage Incentives by State: 2026 Rebate Programs and Tax Credits
✎ PES Supply Editorial Team Trade expertise from 50,000+ SKUs and 169 authorized brands 13 min read Battery...
Solar Market Outlook H2 2026: Panel Prices, Supply Chain, and Demand Trends
The first half of 2026 gave the solar industry a strange combination: record global installations alongside a sharp...
Solar Industry Tariff Updates: What Installers Need to Know in 2026
We field tariff questions from installers every single week, and the honest summary for 2026 is this: the...
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Solar Microgrids: How Communities Can Build More Resilient Energy Systems
Last Updated: August 2026 • A Practical Overview for Municipalities, Campuses, and Community Organizers A single home with solar and a battery can keep the lights on during an outage....
Solar Microgrids: How Communities Can Build More Resilient Energy Systems
Last Updated: August 2026 • A Practical Overview for Municipalities, Campuses, and Community Organizers A single home with solar and a battery can keep the lights on during an outage....
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AI + Solar Energy: How Artificial Intelligence Is Changing Solar System Design
Last Updated: August 2026 • An Industry Overview for Installers, Contractors, and Property Owners Solar system design used to mean a designer manually pulling satellite imagery, estimating roof pitch by...
AI + Solar Energy: How Artificial Intelligence Is Changing Solar System Design
Last Updated: August 2026 • An Industry Overview for Installers, Contractors, and Property Owners Solar system design used to mean a designer manually pulling satellite imagery, estimating roof pitch by...
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Volts to Amps Conversion: How to Calculate Amps from Volts (Calculator 2026)
Volts to Amps: How to Calculate Current from Voltage Volts alone can't make amps — add watts or ohms and the calculator does the rest, with NEC breaker sizing built...
Volts to Amps Conversion: How to Calculate Amps from Volts (Calculator 2026)
Volts to Amps: How to Calculate Current from Voltage Volts alone can't make amps — add watts or ohms and the calculator does the rest, with NEC breaker sizing built...
