The maker's photo for this series, not this exact size; the outdoor unit grows with capacity

MRCOOL · Single-Zone

MRCOOL Advantage 5th Gen 24,000 BTU

Name: MRCOOL Advantage 5th Gen 24,000 BTU
Brand: MRCOOL
Price: 1615 USD
Availability: InStock

A-24-HP-WMAH-230D-O / A-24-HP-C-230D-O

~$1,615approximate retailer price at last check, equipment only

Check price on Amazon

Paid link: this site earns a commission on qualifying purchases. The price on Amazon may differ.

BTU/h: 24k
Volts: 230
Zones: 1
SEER2: 18.7
HSPF2: 9.3
Heats to: —
Refrig.: R-454B
Covers: 1,200 ft²
Wi-Fi: Built in

Best forTwo-ton installs with a long lineset run, such as detached garages or outdoor units placed away from the house.

Overview

The 24k Advantage is where MRCOOL's long lineset allowance shows: the spec table lists up to 164 ft between the head and the outdoor unit, far more than the 25 to 50 ft most online brands cover. It is rated 18.7 SEER2, 10.0 EER2 and 9.3 HSPF2 (7.3 in region V), uses R-454B and has Wi-Fi built into the head, and MRCOOL's page claims coverage to 1,200 sq ft. At $1,615 it is priced slightly above the Pioneer Diamante Pro 24k ($1,488, 21.0 SEER2 / 9.5 HSPF2) and it is rated lower. It is a sensible pick when the outdoor unit has to sit a long way from the wall, or when a MRCOOL dealer is the only local support, but not on efficiency per dollar.

164 ft max lineset
Up to 1,200 sq ft per MRCOOL

Cold-weather output

At 5°F it still makes 71% of its rated heat, according to the certified NEEP listing for this pairing.

COP at 5°F: 2.14
Refrigerant: R-454B
AHRI cert.: 216032586
ENERGY STAR cold climate: Yes

Pairing: A-24-HP-C-230D-O with A-24-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

+164 ft maximum lineset in the spec table
+Wi-Fi with Alexa and Google voice built in
+20 A breaker is easier to wire than a 25 A circuit
+41.5 dBA at the quietest indoor setting

Catches

−Pioneer Diamante Pro 24k is cheaper at $1,488 with 21.0 SEER2
−Short base warranty unless registered and enrolled in MRCOOL Care
−No published low-temperature heating limit
−Lineset sold separately and 3/8 and 5/8 in. copper is not cheap at long lengths

Questions buyers ask

Should I buy the MRCOOL Advantage 24k or the Pioneer Diamante Pro 24k?+

Pioneer is cheaper at about $1,488 against about $1,615 and rated 21.0 SEER2 against MRCOOL's 18.7. The Pioneer's warranty is up to 5 years. The MRCOOL includes Wi-Fi and lists a larger 1,200 sq ft coverage.

What is the winter capacity?+

NEEP certifies 24,000 BTU at 47°F and 17,000 BTU at 5°F, a COP of 2.14. MRCOOL does not publish a low-ambient floor. That is about 71 percent of nameplate at 5°F.

What does installation require?+

A licensed contractor, with a 3/8 in. liquid and 5/8 in. suction flare lineset sold separately. R-454B (A2L) needs a trained tech.

Is the warranty long?+

No. Its base is 2 years parts and 1 year compressor, according to MRCOOL's page. A lifetime replacement option requires registering within 60 days and the paid MRCOOL Care plan.