ACiQ · Single-Zone
ACIQ-18W-HH-MD / ACiQ-18ZPL-HP230C
~$2,297approximate retailer price at last check, equipment only
Best forCold-climate homeowners working with a contractor who stocks Ferguson and wants the longest compressor warranty at this price.
The Extreme is ACiQ's cold-climate line, and the 18k is rated 21.4 SEER2 and 11.0 HSPF2 with heating specified to -22°F and Wi-Fi enabled. It shares the 12-year compressor and 7-year parts warranty with the Standard series, two years longer on the compressor than the Senville Aura. At about $2,297 it sits about $200 above the Senville Aura 18k and about $1,800 under the Gree Sapphire R-32 18k. NEEP lists it holding its full 18,000 BTU/h at 5°F, which the Aura cannot show because it has no NEEP listing. AHRI certificate 216032336 is listed. Efficiency is a few points below the Standard series, which is typical when a unit is tuned for low-temperature heating.
At 5°F it still makes its full 47°F rated heat, according to the certified NEEP listing for this pairing. ACiQ rates it to keep running down to -22°F.
Pairing: ACIQ-18ZPL-HP230C with ACIQ-18W-HH-MD. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.
A -22°F floor against -13°F, and certified 18,000 BTU at 5°F against the Standard's 13,000. The Extreme is rated 21.4 SEER2 and 11.0 HSPF2, a little below the Standard's 24.0 and 11.1. Buy it for the cold output, not efficiency.
NEEP certifies 18,000 BTU at both 47°F and 5°F with a COP of 1.92, and the maker rates it to -22°F. It holds its capacity in the cold. Check the 5°F figure against your load.
Yes, in practice. ACiQ is Ferguson's house brand and the lineset is sold separately. The unit needs charging and evacuation, and R-454B is A2L.
ACiQ · Single-Zone
~$1,615
Homeowners using a contractor who wants a long warranty and strong efficiency from a 1.5-ton head in a cool, not extreme, climate.
ACiQ · Multi-Zone
~$3,350
Two large rooms where each needs an 18k head and the buyer wants a long registered compressor warranty at a low price.
Carrier · Single-Zone
~$2,300
Buyers who want dealer-installed, name-brand cold-climate performance with a strong local service network behind it.