The maker's photo for this series, not this exact size; the outdoor unit grows with capacity
Perfect Aire · Single-Zone DIY
4PAMSHQCW24 / 4PAMSHQCO24
~$2,350approximate retailer price at last check, equipment only
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Best forA large open room or addition where one 2-ton head replaces a contractor install and the condenser can sit within 25 ft.
At 24,000 BTU and about 1,000 sq ft, this is the biggest single-zone Perfect Aire kit sold with Quick Connect fittings. It carries the highest efficiency of the three sizes in the R-454B family, 22.5 SEER2 with a 9.5 HSPF2, and NEEP's listing shows 19,800 BTU/h at 5°F against a 24,000 BTU/h rating at 47°F, about 82%. That is a better cold-weather hold than MRCOOL's Easy Pro 24k manages (17,000 BTU/h of a 25,000 BTU/h rating), though the Easy Pro costs a little less. It is a candidate for a big open room, an addition or a detached garage where a contractor's quote would add $2,000 or more to the equipment cost. The usual trade applies: precharged lines make the install simple and the lineset length inflexible.
At 5°F it still makes 83% of its rated heat, according to the certified NEEP listing for this pairing. Perfect Aire rates it to keep running down to -4°F.
Pairing: 4PAMSHQCO24 with 4PAMSHQCW24. Checked October 8, 2026 on NEEP's ccASHP list; a different head or condenser posts different numbers.
The refrigerant side is, since the 25 ft lineset is precharged R-454B with no pump or gauges. The condenser weighs about 121 lb, so lifting it onto a pad or bracket takes two people.
A 230V circuit with a 35A maximum fuse. That is a step up from the 18k's 30A, so check panel capacity first.
NEEP lists 24,000 BTU at 47°F and 19,800 BTU at 5°F, about 83% of nameplate, with COP 1.84. The maker's low-ambient rating is -4°F and it is ENERGY STAR cold climate listed.
The Perfect Aire costs $2,350 against $2,109 for the Easy Pro. It keeps 19,800 BTU at 5°F against 17,000, ships a 25 ft lineset instead of 11.5 ft, and carries 7 years of parts and compressor coverage. The Easy Pro is the cheaper choice for milder winters.
Series photoPerfect Aire · Single-Zone DIY
~$1,949
A homeowner doing the install alone who wants cold-weather heat from one 18k head at a lower price than MRCOOL's DIY line.
Series photoPerfect Aire · Single-Zone DIY
~$1,499
Budget DIYers in mild-winter states who want the MRCOOL experience for less money.
MRCOOL · Single-Zone DIY
~$2,370
A 350-500 sq ft bedroom, office, or garage where only a 115V circuit is practical and you want the DIY install.