HVAC manufacturers and suppliers enacted a wave of September price updates, with most changes falling in the mid-single-digit range but several double-digit moves in select categories. Copper-linked lines and tariff-exposed products were the most frequently cited factors. Southwire was a notable outlier, reducing wire pricing by 2-8% effective September 22. 

Sept 1: Resideo/Honeywell Home +7.02%; Viessmann +3%; Air Products & Controls–Apollo Fire +10%; Bard service parts only (varies); Design Polymerics +15% on DP 240/340; Harris Products Group varies (tariffs). 

Sept 5: Honeywell Commercial varies; NDL Industries +10% (ACR & PAC copper fittings, refrig. ball valves). 

Sept 6: Emerson (Nidec Motors) +5%. 

Sept 8: Refco +4-18% (tariff impact by country of origin). 

Sept 15: ADP up to +6% (copper coils & copper air handlers). 

Sept 18: Market copper note — various impacts reported across the chain (amounts vary by supplier/SKU). 

Sept 22: Southwire 2-8% (wire). 

Sept 27: Resideo 0-10% (varies by product). 

Sept 29: Legend Valve up to +25% (varies by category).