Refrigerant Uncategorized R454B Shortage May 19, 2025 / June 11, 2025 by Scott | 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. If we don’t have any refrigerant available to top the system off, what can we do? Read more » a2l hfo hvac install r454b refrigerant repair shortage