Refrigerant Uncategorized R454B Shortage May 19, 2025 / May 19, 2025 by Scott Allen | Leave a Comment The problem with this besides repairing refrigerant circuits contained R454B, is installing new systems that don’t have enough refrigerant pre charged with the line sets being fifteen foot or longer. […] Read more » a2l hfo hvac install r454b refrigerant repair shortage