The maker's photo for this series, not this exact size; the outdoor unit grows with capacity
MRCOOL · Single-Zone
A-12-HP-WMAH-230D-O / A-12-HP-C-230D-O
~$989approximate retailer price at last check, equipment only
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Best forBudget-minded buyers with a licensed installer lined up for a single bedroom or office up to about 550 sq ft.
MRCOOL's Advantage is its budget professional-install line, priced below the Olympus series: it ships as a 12,000 BTU wall mount with a 230V outdoor unit rated 21.3 SEER2, 10.8 EER2 and 9.1 HSPF2 (region IV; 7.0 in region V). It switched to R-454B for the 5th generation, and Wi-Fi through MRCOOL's SmartHVAC app is built into the head. The big difference from the DIY and Easy Pro lines in this catalog is the install model: MRCOOL's own page states that this is not DIY and that the warranty depends on a licensed contractor. At $989 for the pair it comes in under $1,000 with an AHRI-certified rating, but the base warranty is only 1 to 2 years, so the low price comes with a short safety net unless you pay for the MRCOOL Care program.
At 5°F it still makes 67% of its rated heat, according to the certified NEEP listing for this pairing.
Pairing: A-12-HP-C-230D-O with A-12-HP-WMAH-230D-O. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.
No. MRCOOL's limited warranty applies only to systems installed by a state-certified or licensed HVAC contractor, and the flare lineset (sold separately) needs nitrogen testing and evacuation. It is R-454B, an A2L mildly flammable refrigerant. Do not confuse it with the DIY series.
MRCOOL's page lists 2 years parts and 1 year compressor to the registered owner, with a 1-year remote warranty. Retailer pages disagree on which of parts or compressor gets 2 years, so confirm before buying. A limited lifetime replacement warranty requires registration within 60 days and enrolling in the paid MRCOOL Care program within 4 months of install.
MRCOOL publishes no low-ambient floor. NEEP certifies 12,000 BTU at 47°F but 8,000 BTU at 5°F, with a COP of 1.91, about two thirds of nameplate. Treat it as mild-climate heat.
The price is low for a 12,000 BTU system with built-in Wi-Fi, 21.3 SEER2 and 9.1 HSPF2. The trade-off is the short base warranty, which is 1 to 2 years against Senville's 5 to 10 or Pioneer's 5.
MRCOOL lists about 550 sq ft. The lineset is 1/4 in. liquid and 3/8 in. suction, and the breaker is 15A maximum.
Series photoMRCOOL · Single-Zone
~$1,312
Homes that need a longer lineset run to a 1.5-ton head and have a licensed installer and a plan to register for warranty.
MRCOOL · Single-Zone
~$1,532
MRCOOL fans who want contractor-grade install and real winter output instead of quick-connect convenience.
Series photoMRCOOL · Single-Zone
~$1,615
Two-ton installs with a long lineset run, such as detached garages or outdoor units placed away from the house.