MRCOOL · Single-Zone
~$1,532
MRCOOL Olympus Hyper Heat 12,000 BTU
MRCOOL fans who want contractor-grade install and real winter output instead of quick-connect convenience.
- BTU/h
- 12k
- Volts
- 230
- Refrig.
- R-410A
- SEER2
- 25.5
- HSPF2
- 10.4
- Heats to
- -13°F
The maker's photo for this series, not this exact size; the outdoor unit grows with capacity
MRCOOL · Single-Zone
MRCOOL Advantage 5th Gen 18,000 BTU
A-18-HP-WMAH-230D-O / A-18-HP-C-230D-O
~$1,312approximate retailer price at last check, equipment only
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- BTU/h
- 18k
- Volts
- 230
- Zones
- 1
- SEER2
- 19.2
- HSPF2
- 9.6
- Heats to
- —
- Refrig.
- R-454B
- Covers
- 800 ft²
- Wi-Fi
- Built in
Best forHomes that need a longer lineset run to a 1.5-ton head and have a licensed installer and a plan to register for warranty.
Overview
The Advantage 18k is MRCOOL's lowest-priced professional 1.5-ton wall mount: $1,312 for a pair rated 19.2 SEER2, 10.8 EER2 and 9.6 HSPF2 (7.5 in region V), with a heating capacity listed at 18,800 BTU against 18,000 for cooling. It uses R-454B, built-in Wi-Fi with the SmartHVAC app, and a 5-speed indoor head that runs from 19 to 50.5 dBA. Next to the Senville Leto 18k ($970, 19.2 SEER2, 8.7 HSPF2) the Advantage has the better heating number but costs about $340 more; next to the Pioneer Diamante Pro 18k ($1,178, 21.0 SEER2) it is rated lower. Its selling point is the 98 ft lineset limit and MRCOOL's parts network, not a low price or top efficiency.
- 98 ft max lineset
- 9.6 HSPF2 beats the Leto 18k's 8.7
Cold-weather output
At 5°F it still makes 61% of its rated heat, according to the certified NEEP listing for this pairing.
- COP at 5°F
- 2.15
- Refrigerant
- R-454B
- AHRI cert.
- 216032585
- ENERGY STAR cold climate
- No
Pairing: A-18-HP-C-230D-O with A-18-HP-WMAH-230D-O. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.
Strengths and catches
Strengths
- +9.6 HSPF2 beats the Senville Leto 18k's 8.7
- +Lineset may run up to 98.4 ft per the spec table
- +Wi-Fi and Alexa/Google voice support built in
- +Heating capacity rated at 18,800 BTU
Catches
- −Pioneer Diamante Pro 18k is cheaper and rated 21.0 SEER2 / 9.5 HSPF2
- −Base warranty is short (1 to 2 years) unless you register and pay for MRCOOL Care
- −MRCOOL publishes no low-temperature heating limit
- −Lineset sold separately
Questions buyers ask
How does the MRCOOL Advantage 18k compare to the Pioneer Diamante Pro 18k?+
The Pioneer is cheaper at about $1,178 against $1,312 and is rated 21.0 SEER2 and 9.5 HSPF2 against 19.2 and 9.6. The MRCOOL has built-in Wi-Fi, while the Pioneer needs an optional module. The MRCOOL's base warranty is shorter.
How good is the heating in cold weather?+
MRCOOL publishes no low-ambient floor. NEEP certifies 18,800 BTU at 47°F and 11,500 BTU at 5°F, with a COP of 2.15. At 5°F that is about 61 percent of nameplate, so it is not cold-climate primary heat.
Is the Advantage 18k a DIY install like MRCOOL's DIY line?+
No. The warranty applies only to licensed-contractor installs, and the flare lineset (sold separately) needs nitrogen testing and evacuation. R-454B is mildly flammable (A2L).
What size space suits the Advantage 18k?+
It is listed for about 800 sq ft, which suits an open living area. The flare lineset is 1/4 in. liquid and 1/2 in. suction and is sold separately.
Similar systems
Everything from MRCOOL
Series photoMRCOOL · Single-Zone
~$1,615
MRCOOL Advantage 5th Gen 24,000 BTU
Two-ton installs with a long lineset run, such as detached garages or outdoor units placed away from the house.
- BTU/h
- 24k
- Volts
- 230
- Refrig.
- R-454B
- SEER2
- 18.7
- HSPF2
- 9.3
- Heats to
- —
Series photoMRCOOL · Single-Zone
~$989
MRCOOL Advantage 5th Gen 12,000 BTU
Budget-minded buyers with a licensed installer lined up for a single bedroom or office up to about 550 sq ft.
- BTU/h
- 12k
- Volts
- 230
- Refrig.
- R-454B
- SEER2
- 21.3
- HSPF2
- 9.1
- Heats to
- —