RJ HVAC

Which MRCOOL do I need?

Five lines we actually stock. The differences that matter here are who hangs it, whether it has to heat a real winter, and how many rooms. Warranty, line set, and ENERGY STAR are not the same across the board.

Answer three questions

We’ll point you at a line, then you can size it or open the shop.

Who’s hanging it?

Main job

How many rooms?

Start here

DIY Hyper Heat is rated −22°F to 122°F and ENERGY STAR Cold Climate. Standard 5th Gen DIY still heats, but this is where we start for a Flathead winter.

Montana winter

DIY Hyper Heat

A Flathead room, cabin, or shop that has to heat.

Install: DIY Quick Connect — no vacuum. We can hang it too.
Heat: Operational range −22°F to 122°F. Holds capacity in real cold.
Warranty: 7-year compressor / 5-year parts
Efficiency: Up to 23.5 SEER2

ENERGY STAR® V6.1 Cold Climate (12k and 18k)

$2,532 $3,173

Shop DIY Hyper Heat

Hang it yourself

5th Gen DIY

One room you want to install yourself.

Install: DIY — no special tools. 25-ft Quick Connect in the complete kit.
Heat: Heats and cools. Not Hyper Heat — not our first pick as the only heat in a Kalispell winter.
Warranty: 7-year compressor / 5-year parts
Efficiency: Up to 23.6 SEER2

9k–24k ENERGY STAR® + federal tax-credit eligible. 36k is not.

$2,329 $2,359 $2,909

Shop 5th Gen DIY

Shop Hyper Heat Size my system

Side by side

Specs from MRCOOL’s residential catalog (V 07.28.26). Advantage is the short-warranty contractor line. DIY Hyper Heat is where we start as the only heat in a Kalispell winter.

	DIY Hyper HeatMontana winter	5th Gen DIYHang it yourself	DIY multi-zone2–6 rooms, one outdoor	AdvantageLowest equipment price	OlympusContractor, high efficiency
Who installs	DIY Quick Connect — no vacuum. We can hang it too.	DIY — no special tools. 25-ft Quick Connect in the complete kit.	DIY Quick Connect per head. Factory matchup chart when you size the system.	Must be installed by a qualified HVAC technician. No Quick Connect.	Professional HVAC contractor. Wall, cassette, or ducted indoor.
Line set	Pre-charged Quick Connect in the complete kit	25-ft pre-charged QC (16 / 35 / 50 ft extras)	One QC line set per indoor (16 / 25 / 35 / 50 ft)	Copper — vacuum and flare required. Not in the box.	Copper line set. Vacuum required.
Winter heat	Operational range −22°F to 122°F. Holds capacity in real cold.	Heats and cools. Not Hyper Heat — not our first pick as the only heat in a Kalispell winter.	Standard 5th Gen, not Hyper Heat. Still heats; a single Hyper Heat head is the stronger winter performer.	About 5°F. Cooling-first — not primary Flathead heat.	Factory heat to about −13°F. Not Hyper Heat. For Kalispell primary heat we start with DIY Hyper Heat and hang it.
Warranty	7-year compressor / 5-year parts	7-year compressor / 5-year parts	7-year compressor / 5-year parts	2-year compressor / 1-year parts	7-year compressor / 5-year parts
SEER2	Up to 23.5 SEER2	Up to 23.6 SEER2	21.8–23.9 SEER2	Up to 21.5 SEER2	Up to 27.4 SEER2 (9k E-Star)
ENERGY STAR / tax credit	ENERGY STAR® V6.1 Cold Climate (12k and 18k)	9k–24k ENERGY STAR® + federal tax-credit eligible. 36k is not.	All 18–55k outdoors: ENERGY STAR® + federal tax-credit eligible	Select 9k sizes. Not the rebate line.	E-Star singles: ENERGY STAR® + federal tax-credit eligible
Best for	A Flathead room, cabin, or shop that has to heat.	One room you want to install yourself.	Two to six rooms, one outdoor, you hang it.	Contractor install when equipment price is the driver.	Pro install, hidden indoor (cassette/ducted), or a high-SEER single zone.