Refrigerants
The A2L refrigerant transition, R-410A and R-454B rules, what is legal to install and service, and what the change costs contractors and owners.
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What Is R-454B? The A2L Refrigerant That Replaced R-410A
R-454B is what most manufacturers moved to after the 700 GWP threshold bit on January 1, 2025. The A2L classification, not the GWP, is what changes handling, tooling…
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The 2026 Refrigerant Leak Rules Exclude Residential HVAC
The leak repair regime at 40 CFR 84.106 took effect January 1, 2026 and explicitly excludes residential and light commercial air conditioning. What it covers, and what still…
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EPA 608 Certification: Which Type HVAC Technicians Actually Need
Four certifications defined by appliance pressure class, not job title. Type II is what most residential HVAC work requires, apprentices are exempt while supervised, and none of it…
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The HFC Phasedown Halves Again in 2029. Here Is the Schedule.
Allowances halve from 60% of baseline to 30% on January 1, 2029, the largest single step in the schedule. What that means for a very large installed base…
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Can You Still Install R-410A in 2026? What the Rule Actually Says
EPA removed the installation cutoff for pre-2025 inventory. Most published guidance still describes the old rule. Here is the regulation, quoted directly.